CN109182327A - Application and preparation method thereof of the magnetic nano-particle in nucleic acid extraction - Google Patents
Application and preparation method thereof of the magnetic nano-particle in nucleic acid extraction Download PDFInfo
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- CN109182327A CN109182327A CN201811004751.5A CN201811004751A CN109182327A CN 109182327 A CN109182327 A CN 109182327A CN 201811004751 A CN201811004751 A CN 201811004751A CN 109182327 A CN109182327 A CN 109182327A
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- nucleic acid
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- nanoparticle
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/10—Processes for the isolation, preparation or purification of DNA or RNA
- C12N15/1003—Extracting or separating nucleic acids from biological samples, e.g. pure separation or isolation methods; Conditions, buffers or apparatuses therefor
- C12N15/1006—Extracting or separating nucleic acids from biological samples, e.g. pure separation or isolation methods; Conditions, buffers or apparatuses therefor by means of a solid support carrier, e.g. particles, polymers
- C12N15/1013—Extracting or separating nucleic acids from biological samples, e.g. pure separation or isolation methods; Conditions, buffers or apparatuses therefor by means of a solid support carrier, e.g. particles, polymers by using magnetic beads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/08—Ferroso-ferric oxide [Fe3O4]
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
- C01P2002/82—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by IR- or Raman-data
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/04—Particle morphology depicted by an image obtained by TEM, STEM, STM or AFM
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Abstract
The invention discloses a kind of application of magnetic nano-particle in nucleic acid extraction, the magnetic nano-particle is the magnetic Fe that surface is coated with poly-dopamine coating3O4Nanoparticle.Magnetic nano-particle provided by the invention has superparamagnetism, high environmental stability and monodispersity, the poly-dopamine coating of nanoparticle surface cladding is rich in amino, hydroxyl group, it can be realized the efficient absorption to nucleic acid, improve the efficiency and quality of existing magnetic nano-particle absorption nucleic acid, it can be realized the efficient rapidly extracting of nucleic acid, when being applied to the extraction of people's whole blood, without carrying out blood treatment, it is suitable for the diagnosis and treatment of clinical disease gene.The preparation method of above-mentioned magnetic nano-particle disclosed by the invention, is effectively simplified the preparation process of the magnetic nano-particle as nucleic acid absorption reagent, reduces preparation cost, the preparation and application suitable for magnetic nano-particle.
Description
Technical field
The invention belongs to technical field of nano material, and in particular to a kind of application of magnetic nano-particle in nucleic acid extraction
And preparation method thereof.
Background technique
Nucleic acid is storage, the material base that replicates and convey hereditary information, be organism normally grow, develop, breeding,
A series of and key substance of great vital movements such as heredity and variation.Therefore, nucleic acid isolate and purify be genetic engineering or
The matter of utmost importance for needing to solve in protein engineering research.Meanwhile the separation of DNA is vital mistake in molecular biology
Journey, and start the basic step of other downstream activities (if being sequenced, expand, hybridize, connect, clone and biological detection).
Currently, nucleic acid extraction technology can be divided into liquid phase extraction and solid phase extractions according to the difference of method for extracting nucleic acid
Two classes.Compared with liquid-phase extraction process, solid phase extractions can overcome liquid phase extract in organic phase and water phase be not completely separated from
Disadvantage.Solid-phase extraction method mainly utilize between solid-phase adsorbent and nucleic acid interaction (electrostatic interaction, affinity interaction, hydrogen bond,
Ion exchange etc.), realize the purpose of separation nucleic acid.Wherein, using magnetic nano-particle (MNP) as the magnetic solid phase of solid-phase adsorbent
Abstraction technique (MSPE), since magnetic nano-particle (MNP) can be removed by external magnetic field, be increasingly being applied to from
Genomic DNA is extracted in bacterium or cell pyrolysis liquid.Magnetism in magnetic solid phase extraction technology (MSPE), as solid-phase adsorbent
The selection of nanoparticle (MNP) has great influence for the efficiency, quality, cost of nucleic acid extraction.
Change its magnetism since magnetic nano-particle is easy aggregation, in the prior art usually in the table of magnetic nano-particle
Bread covers one layer of shell, for example, silica (SiO2) due to good hydrophily, nontoxic and magnetic Nano can be protected
Particle is widely used in coated magnetic nanoparticle.Currently, mostly using greatlyThe magnetic of method synthetic silica package
Property nanoparticle, i.e., hydrolyzed under base catalysis using silylating reagent (such as tetraethoxysilane), the magnetism of synthesis core shell structure
Particle, and the particle can be modified using silylating reagent again, be realized by surface modification group to nucleic acid molecules
Enrichment is extracted.Above-mentioned coated Si O2Although magnetic nano-particle can be realized the extraction to nucleic acid molecules, but SiO2Encapsulation steps
Obtaining magnetic nano-particle, preparation cost increases, preparation process complicates；Also, above-mentioned coated Si O2Magnetic nano-particle with
When nucleic acid extraction, there is a problem of that adsorption efficiency is low.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is that overcoming in the prior art for extracting the magnetic nano particle of nucleic acid
Son haves the defects that adsorption efficiency is low.
For this purpose, the present invention provides the following technical scheme that
The present invention provides a kind of application of magnetic nano-particle in nucleic acid extraction, the magnetic nano-particle is surface
It is coated with the magnetic Fe of poly-dopamine coating3O4Nanoparticle.
Optionally, above-mentioned application, the saturation magnetization of the magnetic nano-particle are 40.7emu/g, the magnetism
The partial size of nanoparticle be 110-130nm, the poly-dopamine coating with a thickness of 20nm.
The present invention provides a kind of preparation methods of magnetic nano-particle, comprising the following steps:
(1) with FeCl3·6H2O is raw material, hydro-thermal method synthesizing magnetic Fe3O4Nanoparticle；
(2) dopamine hydrochloride, Tris-HCl buffer and water are mixed to form dopamine solution, it is molten to the dopamine
The magnetic Fe is added in liquid3O4Nanoparticle stirs 10h at room temperature, obtains black precipitate；
(3) black precipitate is washed, is dried, and obtains to surface and is coated with the magnetic Fe of poly-dopamine coating3O4It receives
Rice corpuscles.
Optionally, above-mentioned preparation method, the concentration of the Tris-HCl buffer are 10mM, pH 8.5；It is described
Tris-HCl buffer: the dopamine hydrochloride: the magnetic Fe3O4Nanoparticle (g:g:g) is 3:5:5.
Optionally, above-mentioned preparation method, the step (1) include:
By FeCl3·6H2O is dissolved in ethylene glycol, and ultrasonic treatment obtains clear solution；
Sodium acetate and polyethylene glycol 10000 are added into the clear solution, is vigorously stirred, obtains deep yellow solution；
The deep yellow solution is heated 48 hours at a temperature of 200 DEG C, then washed, drying process obtains magnetism
Fe3O4Nanoparticle.
Still optionally further, above-mentioned preparation method, the FeCl3·6H2O: the ethylene glycol: the sodium acetate: described
Polyethylene glycol 10000 (g:L:g:g)=1.35:0.04:3.6:1.
Optionally, above-mentioned application, the magnetic nano-particle are made by the described in any item methods of claim 3-6.
Optionally, above-mentioned application, the nucleic acid extraction the following steps are included:
The nucleic acid in biological sample is cracked, nucleic acid binding soln and magnetic Nano are added into the sample solution after cracking
Particle；The magnetic nano-particle is the magnetic Fe that surface is coated with poly-dopamine coating3O4Nanoparticle, the nucleic acid combine
Solution includes polyethylene glycol and sodium chloride；
Magnetic nano-particle combination nucleic acid forms magnetic Fe3O4The compound of nanoparticle and nucleic acid is made in external magnetic field
Under, the compound is isolated；
After compound washing, drying, Nucleic Acid Elution solution is added to the compound, in external magnetic fields
Under, separate the magnetic Fe3O4Nanoparticle and the nucleic acid, obtain the nucleic acid.
Still optionally further, above-mentioned application, the nucleic acid binding soln include the polyethylene glycol of 20% (w/v), 4mol/
The sodium chloride of L, the pH of the nucleic acid binding soln are 2.
Optionally, above-mentioned application, the biological sample are people's whole blood sample, the nucleic acid in the cracking biological sample
Include:
The anticoagulant containing dipotassium EDTA is added into people's whole blood sample, deionized water is then added and destroys red blood cell
Film mixes repeatedly, discards supernatant after centrifugation, obtains sediment；
The solution containing Proteinase K is added into the sediment, dissolves the sediment, it is then quiet at a temperature of 65 DEG C
It sets, collects supernatant, contain nucleic acid in the supernatant.
Technical solution of the present invention has the advantages that
1. application of the magnetic nano-particle provided by the invention in nucleic acid extraction, the magnetic nano-particle is surface packet
It is covered with the magnetic Fe of poly-dopamine coating3O4Nanoparticle.
Cause its magnetism to change since ferric oxide nano particles are easy aggregation, limits its suction as magnetic Nano material
Attached extracting power, magnetic Fe provided by the invention3O4Nanoparticle, surface are coated with poly-dopamine coating.Dopamine coating is not only
With certain colloidal science and chemical stabilization effect, magnetic Fe is prevented3O4Nanoparticle is reunited, and the super suitable of magnetic particle is kept
Magnetism makes the remanent magnetism of magnetic nano-particle and coercivity level off to zero, has stronger magnetic responsiveness；On the other hand, due to more
Bar amine surface can form hydrogen bond by electrostatic interaction or with nucleic acid molecules, realize to nucleic acid rich in amino and hydroxyl group
The absorption of molecule, with existing surface coated Si O2The magnetism of the coatings such as coating, dihydroxysuccinic acid, methyl imidazolium bromide
Fe3O4Nanoparticle or Fe3O4Compared with the magnetic particle that the composite material of carbon nanotube is formed, there is higher DNA absorption
Efficiency (adsorption efficiency is up to 90% or more).Magnetic nano-particle has good dispersibility in aqueous solution, can be realized
To the absorption of the high efficiency of nucleic acid in solution molecule, nucleic acid-nanoparticle compound is obtained, then in the effect of external magnetic field,
Utilize magnetic Fe3O4The superparamagnetism and environmental stability of nanoparticle, can be by nucleic acid-nanoparticle compound from mixing
It is extracted in solution, separation nucleic acid and magnetic nano-particle are the target nucleic acid molecules purified.Magnetic provided by the invention
Property nanoparticle be applied to nucleic acid extraction when, can be realized quick, the high efficiency extraction to nucleic acid, and reducing nucleic acid
The use of chemical reagent in extraction process reduces and injures to the physics and chemistry of nucleic acid, improves the matter of the nucleic acid molecules of separation
Amount, the further biological study analysis such as PCR amplification that nucleic acid molecules are adapted for.
2, the saturation magnetization of magnetic nano-particle provided by the invention is 40.7emu/g, the magnetic nano-particle
Partial size be 110-130nm, the poly-dopamine coating with a thickness of 20nm.The particle diameter distribution of magnetic nano-particle is uniform,
Saturation magnetization is easy to be operated by external magnetic field, has both big specific surface area and superparamagnetism, strong in partial size, saturated magnetization
Degree, the magnetic nano-particle of poly-dopamine coating layer thickness within the above range, surface charge, steric hindrance etc. can reach glue
The requirement of body stability characteristic (quality) gives full play to the synergistic effect of magnetic nano-particle, it is made to have high adsorption to nucleic acid molecules.
3, the preparation method of magnetic nano-particle provided by the invention utilizes hydro-thermal method synthesizing magnetic Fe3O4Nanoparticle,
Magnetic Fe obtained3O4Nano particle diameter is uniform, magnetism characteristic is good, magnetic Fe3O4Nanoparticle and dopamine hydrochloride exist
In the presence of Tris-HCl buffer, stirs the magnetic Fe that surface is coated with poly-dopamine coating is made at room temperature3O4Nanoparticle
Son, preparation method is simple, and condition is easily achieved.In the preparation process of magnetic nano-particle, do not need using coupling agent, and
And do not need to be surface modified nanoparticle to get to the magnetic nano-particle that can be used in nucleic acid absorption, effectively simplify
The preparation process of magnetic nano-particle as nucleic acid absorption reagent, reduces preparation cost.
4, the preparation method of magnetic nano-particle provided by the invention, by controlling concentration, the pH of Tris-HCl buffer,
And Tris-HCl buffer, dopamine hydrochloride and magnetic Fe3O4Nanoparticle uses mass ratio, can make poly-dopamine
It is tightly adhered to magnetic Fe3O4The surface of nanoparticle forms the poly-dopamine coating that a layer thickness is 20nm, to improve magnetism
The nucleic acid absorption effect of nanoparticle.
5, hydro-thermal method synthesizing magnetic Fe provided by the invention3O4The preparation method of nanoparticle, with FeCl3·6H2O is original
Material, using ethylene glycol as higher boiling reducing agent, avoids magnetic Fe using sodium acetate and polyethylene glycol 100003O4It is prepared by nanoparticle
Reunite in the process, by regulation reaction condition and the additive amount of substance, obtain the particles with superparamagnetism of uniform particle diameter,
And it is suitable for the cladding of the poly-dopamine coating of next step.
6, nucleic acid binding soln and magnetism are added into the sample solution after cracking for method for extracting nucleic acid provided by the invention
Nanoparticle；The magnetic nano-particle is the magnetic Fe that surface is coated with poly-dopamine coating3O4Nanoparticle, the nucleic acid
Binding soln includes polyethylene glycol and sodium chloride.
Using polyethylene glycol and sodium chloride, super good salting liquid ring can be created for the combination of magnetic nano-particle and nucleic acid
Border makes the nucleic acid molecules such as DNA form super poly- state, promotes to form hydrogen bond between dopamine surface group and nucleic acid, and can
Promote the electrostatic interaction between dopamine surface group and nucleic acid by regulation isoelectric point.Magnetic nano-particle is improved to nucleic acid point
The adsorption efficiency of son is especially less than the small fragment DNA of 200bp to fragment length, equally has high adsorption efficiency.
7, method for extracting nucleic acid provided by the invention advanced optimizes nucleic acid binding soln, in polyethylene glycol
Concentration is 20% (w/v), and the concentration of sodium chloride is 4mol/L, when the pH of the nucleic acid binding soln is 2, certain density
Under the conditions of PEG and NaCl, collision and repulsion of the magnetic nano-particle in spatial position increase, and magnetic nano-particle is in suspension
State, it is not easily settled；Meanwhile the molecular conformation of DNA changes, DNA polycondensation increases between DNA molecular and magnetic nano-particle
Hydrogen bond increases collection efficiency.When the pH of nucleic acid binding soln is 2, due to the deprotonation of phosphate group, DNA is negatively charged.Cause
This, the DNA of negative electrical charge can be by electrostatic interaction by positively charged PDA@Fe3O4It is adsorbed；It is combined by setting nucleic acid molten
The concentration of each ingredient and the pH value of solution in liquid can further increase magnetic nano-particle to the adsorption efficiency of nucleic acid, in fact
Existing adsorption efficiency is more than 90% effective nucleic acid extraction.
8, nucleic acid extraction kit and method for extracting nucleic acid provided by the invention are not necessarily to when being applied to whole blood extraction
Whole blood sample is pre-processed, the extraction step of whole blood sample is simplified, the extraction rate of nucleic acid is improved, is adapted for carrying out and faces
Bed quickly gene diagnosis identification.Meanwhile nucleic acid extraction kit provided by the invention and method for extracting nucleic acid are to nucleic acid
Extractability is high, adsorption rate is high, can reduce damage of the organic solvent to nucleic acid, suitable for extracting the circulation dissociative DNA of low content,
Or extract tissue, saliva, bacterium, virus target nucleic acid, provided effectively for the clinical diagnosis of disease and individualized treatment
Nucleic acid extraction tool and method.
Detailed description of the invention
Fig. 1 a is magnetic nano-particle (the PDA@Fe of the embodiment of the present invention 13O4) (0.2 μm of scale) transmission electron microscopy
Mirror phenogram；
Fig. 1 b is magnetic nano-particle (the PDA@Fe of the embodiment of the present invention 13O4) (0.2 μm of scale) transmission electron microscopy
Mirror phenogram；
Fig. 1 c is magnetic nano-particle provided by the invention (PDA@Fe3O4) (0.2 μm of scale) transmission electron microscope table
Sign figure；
Fig. 2 is magnetic nano-particle provided by the invention (PDA@Fe3O4) X-ray diffraction spectrogram；
Fig. 3 is magnetic nano-particle provided by the invention (PDA@Fe3O4) and Fe3O4Magnetization curve figure；
Fig. 4 is magnetic nano-particle provided by the invention (PDA@Fe3O4) infrared absorpting light spectra；
Fig. 5 is magnetic nano-particle provided by the invention (PDA@Fe3O4) and Fe3O4Zeta current potential with pH variation knot
Fruit figure；
Fig. 6 a is PEG concentration in nucleic acid binding soln provided by the invention to PDA@Fe3O4Adsorb genomic DNA efficiency
Influence testing result figure；
Fig. 6 b is NaCl concentration in nucleic acid binding soln provided by the invention to PDA@Fe3O4Adsorb genomic DNA efficiency
Influence testing result figure；
Fig. 6 c is the pH value of nucleic acid binding soln provided by the invention to PDA@Fe3O4Adsorb the influence of genomic DNA efficiency
Testing result figure；
Fig. 7 is that experimental example 2 of the present invention detects nucleic acid extraction kit to the result figure of the adsorption rate of piece segment DNA；
Fig. 8 is that experimental example 3 of the present invention detects nucleic acid extraction kit to the result figure of the extractability of DNA；
Fig. 9 is the agarose gel electrophoresis testing result figure that people's Whole Blood Genomic DNA is extracted in the embodiment of the present invention 3；
Figure 10 is people's Whole Blood Genomic DNA to extract in the embodiment of the present invention 3 as the electrophoresis detection of the PCR product of template
Result figure.
Specific embodiment
Technical solution of the present invention will be clearly and completely described below, it is clear that described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.In addition, below
Technical characteristic involved in described different embodiments of the present invention as long as they do not conflict with each other can be mutual
In conjunction with.
The material and reagent being related in following embodiments are as follows:
Ferric chloride hexahydrate (FeCl36H2O) is bought from Tianjin great Mao chemical reagent factory (Chinese Tianjin), anhydrous acetic acid
Sodium (NaAc), ethyl alcohol, diethylene glycol (DEG) (DEG), disodium EDTA (EDTA).Tris (methylol), polyethylene glycol
10000, Macrogol 6000, sodium hydroxide (NaOH) and sodium chloride (NaCl) are purchased from Guangzhou Chemical Reagent Factory (GuangZhou, China).
Dopamine hydrochloride is bought by AlfaAesar company (Chinese Shanghai).Hydrochloric acid (HCl) and acetic acid (CH3COOH) are all from Tianjin Fuyu County
Chemical company (Chinese Tianjin).Water used in experiment is obtained from ELGA water purification system (ELGA, London, Britain).For
Isolated mankind EDTA anticoagulated whole blood collects gained by the second hospital of Lanzhou University (Lanzhou of China).
GeneRuler 50bp~500bp DNA ladder is purchased from Sheng Gong company (Chinese Shanghai), by 10 segment groups
At, from 50 to 500bp, total concentration 0.5mg/ml.Ace Taq archaeal dna polymerase (5U/ μ l), 25mM MgCl 2,10 × PCR
Buffer (100mM Tris-HCl [pH8.3], 500mM KCl) and deoxynucleoside triphosphate (dNTP) mixture (including dATP,
DGTP, dCTP and dTTP, wherein the concentration of every kind of dNTP is 2.5mM) purchased from Nanjing Vazyme Biotechnology Co., Ltd. (south
Capital, China).Primer for PCR reaction is synthesized by Nanjing biotechnology Co., Ltd (Nanjing of China).TIANamp
DNA kit, buffer FG, buffer CL are purchased from Tiangeng biotech company (BeiJing, China).
Embodiment 1
The present embodiment provides a kind of magnetic nano-particle (PDA@Fe3O4) preparation method, comprising the following steps:
(1) with FeCl3·6H2O is raw material, hydro-thermal method synthesizing magnetic Fe3O4Nanoparticle
FeCl3·6H2O (1.35g) is dissolved in ethylene glycol (40mL), forms clear solution by means of ultrasonication.Then,
Sodium acetate (3.6g) and polyethylene glycol 10000 (1.0g) are added in solution, are vigorously stirred mixture until obtaining uniform
Deep yellow solution.The solution is put into polytetrafluoroethylene (PTFE) high-pressure reactor, is heated 48 hours under the conditions of 200 DEG C.Product is used
Ethyl alcohol and water washing for several times, and are dried 10 hours under 60 DEG C of nitrogen atmosphere, obtain carboxy-modified magnetic Fe3O4Nanoparticle
Son, it is spare；
(2) dopamine hydrochloride (200mg) and 0.12g Tris-HCl buffer (10mM, pH8.5) and 100ml water is mixed
Dopamine solution is made in conjunction.Then by carboxy-modified magnetic Fe3O4Nanoparticle (200mg) is added in solution and in room temperature
Lower stirring 10 hours, obtains black precipitate；
(3) black precipitate is washed with water several times, and dry under 60 DEG C of nitrogen atmosphere, obtains magnetic nano-particle
(PDA@Fe3O4)。
Test method and result
To magnetic nano-particle manufactured in the present embodiment (PDA@Fe3O4) characterized, it is as a result as follows:
(1) transmission electron microscope (TEM) characterizes
Using FEI F30 transmission electron microscope (FEI, Hillsboro, USA) to magnetic nano-particle (PDA@Fe3O4)
Partial size and pattern be observed, as a result as shown in Fig. 1 a- Fig. 1 c: PDA@Fe3O4Particle be it is monodispersed, shape levels off to ball
Shape counts the grain diameter in TEM figure by Nano Measurer software, obtains PDA@Fe3O4The size of particle point
Cloth Relatively centralized, in the range of 110-130nm, average grain diameter 120nm.PDA is uniformly coated in Fe3O4Particle
On surface, the thickness of PDA is about 20nm.
(2) X-ray diffraction spectrogram (XRD) characterizes
Using Rigaku X-ray diffractometer D/max-2400 (Rigaku, Tokyo, Japan) to magnetic nano-particle
(PDA@Fe3O4) crystal form information analyzed, as a result as shown in Figure 2: X-ray diffraction obtains 2 θ of the characteristic peak angle of diffraction and appears in
17.8 °, 30.2 °, 35.4 °, 42.9 °, 53.4 °, 57.0 ° and 62.7 °；The corresponding indices of crystallographic plane be (110), (220),
(311), (400), (422), (511) and (533).These peaks indicate that the magnetic-particle of preparation is Fe3O4, and are single phase cubic knot
Structure (JCPDS 88-0315).XRD the result shows that, the PDA layer of amorphous coating is without influencing Fe3O4Crystalline phase.
(3) magnetization curve characterizes
Using being measured at 300k on vibrating specimen magnetometer (PPMS-9, Quantum Design, San Diego, USA)
Magnetic Fe3O4Nanoparticle and surface are coated with the magnetic Fe of poly-dopamine coating3O4Nanoparticle (PDA@Fe3O4) magnetization it is bent
Line analyzes Fe at room temperature by VSM3O4With PDA@Fe3O4Magnetic property.As a result as shown in the magnetization curve in Fig. 3: Fe3O4
With PDA@Fe3O4Saturation magnetization value be respectively 71.5 and 40.7emu/g (Fig. 3).Curve shows PDA Fe3O4There is no magnetic
Stagnant phenomenon, and show negligible remanent magnetism and coercivity, this shows that the nano material summarized has superparamagnetism.Together
When, with Fe3O4It compares, PDA@Fe3O4The decline of saturation magnetization value demonstrates PDA in Fe3O4It is modified on particle.
(4) infrared absorption spectrum (FTIR) characterizes
Use FTIR (PerkinElmer Spectrum GX, USA) analyzing magnetic Fe3O4Nanoparticle (PDA@Fe3O4)
Surface functional group information.As a result as shown in Figure 4: in the figure, being located at about 579cm-1The absorption peak at place is to be present in Fe3O4It receives
The feature of Fe-O key in rice grain.In 1619 and 3418cm-1The peak of appearance corresponds to the water and hydroxyl of adsorption.?
3418cm-1, 2922cm-1, 1466cm-1And 876cm-1The peak of place's display respectively represents the stretching of the OH on phenyl ring, and CH is stretched, C=
C is stretched and CH is stretched, this corresponds respectively to PDA@Fe3O4- OH and-the C=C- functional group of middle phenol.The result shows that PDA passes through
The physics and chemisorption on its surface successfully secure Fe3O4Surface.
(5) zeta potential (Zeta potential) characterizes
The surface charge of adsorbent material has a major impact the adsorption capacity of material, uses ZetasizerNano ZS
(Malvern, Worcestershire, UK) measures zeta potential, as a result as shown in Figure 5: as solution ph increases, two kinds of materials
Zeta potential all reduce.Fe3O4Isoelectric point (PI) be about 5.0.After further being coated with PDA, pI increases to 5.5.PDA@Fe3O4
Surface charge pH value be lower than pI when be positive value, pH value be higher than pI when be negative value.Fe3O4With PDA@Fe3O4The zeta of particle
Current potential reaches maximum value in combining liquid (pH 2.0).Fe3O4Zeta current potential be 12.1mV, and PDA@Fe3O4Zeta current potential
For 28.6mV.PDA@Fe3O4Positive zeta current potential be due to PDA@Fe3O4Surface is generated there are PDA, Fe3O4With PDA@Fe3O4
Zeta potential difference between particle again shows that PDA in magnetic Fe3O4It is modified on nanoparticle.
Embodiment 2
The present embodiment provides a kind of nucleic acid extraction kits, including nucleic acid binding soln and magnetic nano-particle:
Nucleic acid binding soln includes the polyethylene glycol of 20% (w/v), and the pH of the sodium chloride of 4mol/L, nucleic acid binding soln is
2；
Magnetic nano-particle is magnetic nano-particle (the PDA@Fe prepared in embodiment 13O4)。
Embodiment 3
The present embodiment provides a kind of method for extracting nucleic acid, the nucleic acid extraction kit provided using embodiment 2, extracting method
The following steps are included:
(1) DNA in people's whole blood sample is cracked out
1. 300 μ l EDTA-K2 (dipotassium EDTA) anticoagulated bloods micropipette rifle is added in 1.5ml centrifuge tube.It
Afterwards, 300 μ l aseptic deionized waters are added in pipe to destroy erythrocyte membrane.After mixing for several times repeatedly, by mixed liquor with
12000rpm/min is centrifuged 3 minutes, is discarded supernatant liquid, is obtained sediment；
2. buffer CL (300 μ l) is added in sediment, mixture is equally mixed for several times.By mixture with
12000rpm/min is centrifuged 1 minute, discards supernatant liquid；
3. preparing Proteinase K-buffer FG mixed liquor (1:100) (g/V) and being added in precipitating.Slightly by solution immediately
It reverses several times, until sediment is completely dissolved.Then, after brief centrifugation, centrifuge tube is put into 65 DEG C of metal baths and stands 10
Minute, supernatant is collected, contains nucleic acid in the supernatant.Supernatant (cell lysate) is transferred to new 1.5mL
4 DEG C are stored in Eppendorf pipe and before use.
(2) magnetic nano-particle (PDA@Fe3O4) nucleic acid is combined, form magnetic nano-particle (PDA Fe3O4) and nucleic acid
Compound isolates the compound under external magnetic fields；
By cell lysate (150 μ l) be added to containing 300 μ L nucleic acid binding solns (20% (w/v) PEG, 4M sodium chloride,
PH 2.0) 1.5mL Eppendorf pipe in, then be added 40ngPDA@Fe3O4.Mixture is placed to 10 points at room temperature
Clock forms magnetic nano-particle (PDA@Fe3O4) with the compound of nucleic acid.Then, PDA@Fe is separated on magnetic separation frame3O4
With the compound of nucleic acid, liquid is discarded supernatant.
(3)PDA@Fe3O4It is washed twice and is dried at room temperature for 70% (v/v) ethanol solution with the compound of nucleic acid.It is logical
It crosses and 50 μ L elution solution (Fujifilm, Japan, pH 8.0) is added from DNA and PDA@Fe3O4Compound elution absorption DNA
And it incubates 10 minutes at room temperature.Later, Magneto separate is carried out using external magnets.Then the DNA extracted in eluent is used as
The template of subsequent PCR amplification.Quantify the capacity of the DNA absorbed by measuring the absorbance value measured at 260nm, and makes
The ratio of absorbance at 260nm and 280nm assesses the purity of DNA.
Experimental example 1
This experimental example analyzes the dense in different solutions pH, different polyethylene glycol of nucleic acid extraction kit amplifying nucleic acid binding soln
To magnetic nano-particle (PDA@Fe under conditions of degree and different sodium chloride concentrations3O4) adsorption of DNA efficiency influence.
DNA capture and elution use following analysis methods:
In order to study the optimum extraction condition for then separating DNA from people's whole blood, select genomic DNA as Objective extraction
Object measures PDA@Fe3O4Extract the recovery rate of nucleic acid.Genomic DNA is dissolved in aseptic deionized water molten to prepare DNA standard
Liquid (50ng/ μ l).DNA solution (20 μ L, amount of DNA be 1 μ g), 100 μ L combination buffers (isometric PEG solution 0%~
40% } and NaCl solution { 0~6mol/l }) and 30 μ g PDA@Fe3O4It is mixed into 1.5ml EP pipe, mixture total volume is
0.1mL.Then mixture is slowly stirred at a room temperature 10 minutes.Later, Magneto separate is carried out using external magnets.Then careful
Ground takes out supernatant and collects, using 2000 spectrophotometer of Nanodrop (Thermal scientific, USA) in 260nm
Place carries out UV measurement.The amount of DNA of capture is to calculate according to before Magneto separate relative to the residual quantity of DNA in supernatant.It mentions
Rate (%) is taken to be calculate by the following formula:
C0(ng/ μ l) and C (ng/ μ l) respectively represent the initial concentration and supernatant of DNA in solution.V0(μ l) and V (μ
L) DNA solution of original preparation and the volume of supernatant are indicated.With 70% (v/v) ethanol washing DNA and PDA@Fe3O4Mixture
Twice and it is dried at room temperature for.Then by 50 μ l elution buffers of addition (Fujifilm, Japan, pH=8.0) and in room temperature
It is lower to be incubated for 10 minutes, the DNA molecular of absorption is eluted from conjugate.Carefully take supernatant 260nm measure its absorbance value from
And the amount of DNA of magnetic bead absorption is calculated.
Experimental result:
Firstly, the quality based on original gene group DNA is 1 μ g, PDA@Fe3O4For 30 μ g, NaCl concentration 4M, in conjunction with molten
The pH value of liquid is 2.0, under conditions of total volume is 120 μ l, inquires into PEG concentration to PDA@Fe3O4To the capture effect of genomic DNA
The influence of rate.As a result as shown in Figure 6 a, PEG reaches highest extraction efficiency at 20% (w/v), and the capture rate of genomic DNA can
Up to 90.2%.Therefore, 20% PEG optimal conditions is selected to carry out subsequent experiment.The effect master of specified molecular weight and concentration PEG
If interacting with salt ion, changes the molecular conformation of different length DNA, increase the sliminess of system, be in magnetic bead
Suspended state, it is not easily settled, increase magnetic bead in the collision and repulsion of spatial position, to enhance the collection efficiency of nucleic acid and magnetic bead
With effect.
Secondly, having studied the influence that different NaCl concentrations (0M-6M) separate DNA.As shown in Figure 6 b, as concentration is from 1M
Increase to 4M, the amount of DNA of desorption increases.In pH8.0, recovery rate reaches peak value, is 90.3%, therefore the optium concentration of NaCl
About 4M.
Finally, the pH value of solution is also an important influence factor.It can regulate and control between absorbate surface
Electrostatic force, while also there is certain influence on adsorbent material itself electrostatic interaction due to caused by distribution of charges.This research
It has inquired into combination buffer (isometric 20%PEG, 4MNaCl) genomic DNA has been enriched in range from 2.0 to 8.0 in pH and imitated
The influence of rate.As fig. 6 c, the DNA maximum extracted rate of capture is under the conditions of 2.0 pH, corresponding to 90% DNA recovery rate.
The result and electrostatic force are PDA@Fe3O4The supposition of the main drive of adsorption of DNA matches.PDA@Fe3O4In different pH solution
In zeta potential (Fig. 5) show PDA@Fe3O4Isoelectric point be 5.5.Therefore, within the scope of the pH of 2.0-5.0, a certain amount of DNA
It can be by positively charged PDA@Fe3O4Absorption.When pH is higher than 5.5, PDA@Fe3O4It is all negatively charged with DNA, cause in 6.0-
PDA@Fe is adsorbed within the scope of 10.0 pH almost without DNA3O4On.Di-phosphate ester in DNA is that a kind of pKa is strong less than 1
Acid.When higher than pH 1.0, due to the deprotonation of phosphate group, DNA is negatively charged.Therefore, the DNA of negative electrical charge can be by quiet
Electric interactions are by positively charged PDA@Fe3O4It is adsorbed.
Experimental example 2
This experimental example detects magnetic nano-particle (PDA@Fe prepared by embodiment 13O4) to the adsorption rate of piece segment DNA.
Experimental method:
1, using human gene group DNA as template, the position SNP of tetra- genes of PCR amplification APOC3, APOA5, SLC2A9 and ABCG2
Segment at point.PCR reaction system consists of the following components: DNA profiling (0.5 μ L), 2 × PCR buffer, 1.5mM
MgCl2, the forward and reverse primer of 0.4mM dNTP, 0.1mM, 0.25U/ml Taq archaeal dna polymerase and DEPC water.Total reaction volume is
10μL.Contrast solution (blank) contains all PCR reagents in addition to DNA profiling.Tables 1 and 2 lists the primer for PCR
With the amplification condition of different SNP.
1 PCR primer of table
2 PCR amplification condition of table
2, the method for extracting nucleic acid provided using embodiment 3 extracts the DNA fragmentation in PCR reaction solution, wherein Xiang great
Small different PCR product solution (154bp, 202bp, 159bp and 96bp；40ng/ μ l) in be added isometric nucleic acid combine it is molten
Liquid (20%PEG and 4M NaCl；pH2.0；120mL) and the magnetic nano-particle of 0.04mg (PDA@Fe3O4).The DNA of recycling is used
4% Ago-Gel, 100V carry out electrophoretic analysis under conditions of 15 minutes, made with not carrying out the PCR reaction solution of nucleic acid extraction
For control.
Experimental result:
Absorption testing result of Fig. 7 show nucleic acid extracts kit to small fragment DNA.As shown in Figure 7, magnetic nano-particle
(PDA@Fe3O4) it can adsorb from 100bp to 200bp not equal small fragment DNA, and adsorption rate is up to 90% or so, therefore, this
The nucleic acid extraction kit that invention provides can be applied to recycling and the dissociative DNA (100bp~200bp) of amplified production DNA
Enrichment and extraction.
Experimental example 3
This experimental example detects magnetic nano-particle (PDA@Fe prepared by embodiment 13O4) to the extractability of DNA: in nucleic acid
Different amounts of original gene group DNA (2-10 μ g) and PDA@are added in binding soln (20%PEG and 4M NaCl, pH2.0)
Fe3O4(0.06mg).It is incubated for after mixing 10 minutes, then carries out Magneto separate using external magnets, measure its supernatant and exist
Absorbance at 260nm and calculate absorption DNA amount.
Testing result is as shown in figure 8, PDA@Fe3O4Adsorbed DNA quantity be in 2 μ g-8 μ g ranges it is linear, be more than
This range, fractional dose reach platform.PDA@Fe3O4Extractability to DNA is 116.7mg g-1.
Experimental example 4
The application for the people's Whole Blood Genomic DNA extracted in this experimental example detection embodiment 3, by what is extracted in embodiment 3
People's Whole Blood Genomic DNA detects (100V, 12min) with 1% agarose gel electrophoresis.
As a result as shown in Figure 9.After electrophoresis, electrophoresis band shows single bright band under automatic gel imager (Chinese Shanghai).
Select APROC3 gene the site rs121918382 (table 1) expanded, for verify product template for PCR amplification can
It can property.Figure 10 shows standard GeneRuler50bp-500bp DNA ladder, the electrophoretogram of PCR product and blank sample
Spectrum.In the electrophorogram of product DNA (Figure 10), the electrophoresis result of PCR product shows clear background, appropriate single in position
Bright band shows that the genomic DNA that the embodiment of the present invention 3 is extracted can be applied to downstream PCR directly as template.
Comparative example 1
This comparative example compares magnetic nano-particle (the PDA@Fe of the preparation of the embodiment of the present invention 13O4) with commercialization magnetic bead and
The DNA extraction effect of DNA purification kit.Applied magnetic nanoparticle (PDA@Fe3O4) method of DNA is extracted referring to embodiment 3
The method for extracting nucleic acid of offer.
Comparison result is as shown in table 3, magnetic nano-particle (PDA@Fe3O4) be used as magnetic nano-particle in magnetic solid phase extraction
(MSPE) superior adsorption capacity is shown in, the DNA concentration of extraction is high.In addition, using magnetic nano particle provided by the invention
Son (PDA@Fe3O4) DNA is extracted, entire absorption and elution process carry out under room temperature (25 DEG C), are not necessarily to high temperature incubation.In addition,
Using PDA@Fe3O4Nuclei aoid methods without using any toxic solvent and frequently centrifugation, it also avoids in commercial reagents box opposite
A large amount of steps increases the risk of sample loss.The absorbance for the DNA that detection elutes at 260 and 280nm respectively, can by table 3
Know, with PDA@Fe3O4The A260/A280 ratio of the DNA of extraction is 1.82, shows that the DNA purity extracted is enough to act as PCR amplification
Template.
3 PDA@Fe of table3O4With the extraction comparison of commercialization magnetic bead and DNA purification kit
Comparative example 2
This comparative example compares the PDA@Fe of the preparation of the embodiment of the present invention 13O4It is mentioned with the DNA of existing magnetic Nano material
Take the difference of ability and DNA adsorption efficiency, wherein the side to the detection of DNA extractability to provide in the bright experimental example 3 of this law
Method carries out, and the method provided in experimental example 1 of the present invention the detection of DNA adsorption efficiency carries out.Magnetic Nano material is specifically such as
Shown in lower:
DMSA-MNP, Fe3O4Magnetic nanoparticle (MNP) surface modification dimercaptosuccinic acid, MNP partial size about 8.4nm, most
51.4 ± 7.2mV of big zeta current potential；
Fe3O4@SiO2, Fe3O4Magnetic nanoparticle pan coating SiO2, Fe3O4Average grain diameter 14.1nm, SiO2Thickness
1.2nm, saturation magnetization 41.56emug-1；
IL@Fe3O4, Fe3O4Magnetic nanoparticle surface modification 1- hexyl -3- methyl imidazolium bromide, average grain diameter
13nm；
PEI@Fe3O4, Fe3O4Magnetic nanoparticle pan coating polyethyleneimine, PEI@Fe3O4Average grain diameter 100nm, most
Big zeta current potential 45mV；
DES-Fe3O4/ MWCNTs, by Fe3O4Magnetic nanoparticle is formed with the composite material of carbon nanotube (MWCNTs),
Pan coating poly(ethylene glycol) base eutectic solvent, the average diameter of MWCNTs are 10-15nm, Fe3O4Average grain diameter 10-
20nm, maximum zeta current potential about 12mV；
MIm-MPs, Fe3O4Magnetic nanoparticle surface modification N- methylimidazole, MIm-MPs average grain diameter 60nm,
Fe3O4@PANI, Fe3O4Magnetic nanoparticle pan coating polyaniline, Fe3O4The average grain diameter of magnetic nanoparticle
The thickness of about 300nm, PANI (polyaniline) are about 30nm, saturation magnetization 62.2emug-1；
Table 4
| Magnetic Nano material | Extractability (mg/g) | Adsorption rate (%) |
| DMSA-MNP | 30.7 | 86 |
| Fe3O4@SiO2 | 27.86 | 68 |
| IL@Fe3O4 | 19.8 | 65 |
| PEI@Fe3O4 | 61.8 | 85 |
| DES-Fe3O4/MWCNTs | 177.6 | 79 |
| MIm-MPs | 25 | 61 |
| Fe3O4@PANI | 20.08 | 77 |
| PDA@Fe3O4 | 116.7 | 90 |
Testing result is as shown in table 4, with DMSA-MNP, Fe3O4@SiO2、IL@Fe3O4、PEI@Fe3O4、MIm-MPs、
Fe3O4@PANI is compared, PDA@Fe prepared by the embodiment of the present invention 13O4Extractability and DNA with the DNA significantly improved
Adsorption rate；With DES-Fe3O4/ MWCNTs is compared, although PDA@Fe3O4DNA extractability be weaker than DES-Fe3O4/ MWCNTs, but
PDA@Fe3O4It is higher to DNA adsorption efficiency.Based on this, PDA@Fe3O4It can be considered as ideal nucleic acid adsorption material.
In conclusion magnetic nano-particle PDA@Fe provided by the invention3O4It is verified as successfully by PDA functionalization, application
PDA@Fe3O4Human genome DNA can be separated by simple effective method.Transmission electron microscope observing shows PDA@Fe3O4It is
It is monodispersed, highly crystalline, it is distributed with relatively narrow size, and VSM is results showed that its superparamagnetism, this is that biology is answered
Ideal characterisitics.The experimental results showed that the concentration of the adsorption process of nucleic acid and PEG and NaCl solution, the pH value of binding soln
And PDA@Fe3O4Amount it is related.The study found that the PDA@Fe after modification3O4Genomic DNA can be not only extracted, but also can
Expeditiously to extract the lesser DNA of segment.Compared with commercialization magnetic bead and purification column method for extracting nucleic acid, PDA@Fe3O4To blood
Nucleic acid compositions in liquid sample have stronger adsorption capacity (P < 0.05).In addition, PDA@Fe3O4It may be directly applied to mankind's base
, therefore can be more convenient because the extraction and purifying of group DNA is without pretreatment, quickly and efficiently for disease gene in terms of
Consulting services.Most of all, PDA@Fe3O4The applying to efficiently separate in field in biomolecule sample of composite nanoparticle is deposited
In great potential.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments, and it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of application of magnetic nano-particle in nucleic acid extraction, which is characterized in that the magnetic nano-particle is surface packet
It is covered with the magnetic Fe of poly-dopamine coating3O4Nanoparticle.
2. application according to claim 1, which is characterized in that the saturation magnetization of the magnetic nano-particle is
40.7emu/g, the partial size of the magnetic nano-particle are 110-130nm, the poly-dopamine coating with a thickness of 20nm.
3. a kind of preparation method of magnetic nano-particle, which comprises the following steps:
(1) with FeCl3·6H2O is raw material, hydro-thermal method synthesizing magnetic Fe3O4Nanoparticle；
(2) dopamine hydrochloride, Tris-HCl buffer and water are mixed to form dopamine solution, into the dopamine solution
The magnetic Fe is added3O4Nanoparticle stirs 10h at room temperature, obtains black precipitate；
(3) black precipitate is washed, is dried, and obtains to surface and is coated with the magnetic Fe of poly-dopamine coating3O4Nanoparticle
Son.
4. preparation method according to claim 3, which is characterized in that the concentration of the Tris-HCl buffer is 10mM,
PH is 8.5；The Tris-HCl buffer: the dopamine hydrochloride: the magnetic Fe3O4Nanoparticle (g:g:g) is 3:5:
5。
5. preparation method according to claim 3 or 4, which is characterized in that the step (1) includes:
By FeCl3·6H2O is dissolved in ethylene glycol, and ultrasonic treatment obtains clear solution；
Sodium acetate and polyethylene glycol 10000 are added into the clear solution, is vigorously stirred, obtains deep yellow solution；
The deep yellow solution is heated 48 hours at a temperature of 200 DEG C, then washed, drying process obtains magnetic Fe3O4
Nanoparticle.
6. preparation method according to claim 5, which is characterized in that the FeCl3·6H2O: the ethylene glycol: the vinegar
Sour sodium: polyethylene glycol 10000 (the g:L:g:g)=1.35:0.04:3.6:1.
7. application according to claim 1 or 2, which is characterized in that the magnetic nano-particle is any by claim 3-6
Method described in is made.
8. according to claim 1, application described in 2 or 7, which is characterized in that the nucleic acid extraction the following steps are included:
The nucleic acid in biological sample is cracked, nucleic acid binding soln and magnetic nano particle are added into the sample solution after cracking
Son；The magnetic nano-particle is the magnetic Fe that surface is coated with poly-dopamine coating3O4Nanoparticle, the nucleic acid combine molten
Liquid includes polyethylene glycol and sodium chloride；
Magnetic nano-particle combination nucleic acid forms magnetic Fe3O4The compound of nanoparticle and nucleic acid, under external magnetic fields,
Isolate the compound；
After compound washing, drying, Nucleic Acid Elution solution is added to the compound, under external magnetic fields, point
From the magnetic Fe3O4Nanoparticle and the nucleic acid, obtain the nucleic acid.
9. application according to claim 8, which is characterized in that the nucleic acid binding soln includes the poly- second of 20% (w/v)
Glycol, the sodium chloride of 4mol/L, the pH of the nucleic acid binding soln are 2.
10. application according to claim 8 or claim 9, which is characterized in that the biological sample is people's whole blood sample, described to split
Solution biological sample in nucleic acid include:
The anticoagulant containing dipotassium EDTA is added into people's whole blood sample, deionized water is then added and destroys erythrocyte membrane, instead
Compound closes, and discards supernatant after centrifugation, obtains sediment；
The solution containing Proteinase K is added into the sediment, dissolves the sediment, is then stood at a temperature of 65 DEG C,
Supernatant is collected, contains nucleic acid in the supernatant.
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