CN101661003B - Gold nanoshell-based method for determining capability of antioxidant for clearing H2O2 - Google Patents
Gold nanoshell-based method for determining capability of antioxidant for clearing H2O2 Download PDFInfo
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- CN101661003B CN101661003B CN200910036204XA CN200910036204A CN101661003B CN 101661003 B CN101661003 B CN 101661003B CN 200910036204X A CN200910036204X A CN 200910036204XA CN 200910036204 A CN200910036204 A CN 200910036204A CN 101661003 B CN101661003 B CN 101661003B
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- 239000003963 antioxidant agent Substances 0.000 title claims abstract description 92
- 230000003078 antioxidant effect Effects 0.000 title claims abstract description 87
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000010931 gold Substances 0.000 title claims abstract description 72
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 72
- 239000002078 nanoshell Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 56
- 239000011246 composite particle Substances 0.000 claims abstract description 55
- 238000010521 absorption reaction Methods 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000001179 sorption measurement Methods 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 46
- 239000007864 aqueous solution Substances 0.000 claims description 40
- 239000000243 solution Substances 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 23
- 229910019142 PO4 Inorganic materials 0.000 claims description 20
- 239000008366 buffered solution Substances 0.000 claims description 20
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 20
- 239000010452 phosphate Substances 0.000 claims description 20
- SJUCACGNNJFHLB-UHFFFAOYSA-N O=C1N[ClH](=O)NC2=C1NC(=O)N2 Chemical compound O=C1N[ClH](=O)NC2=C1NC(=O)N2 SJUCACGNNJFHLB-UHFFFAOYSA-N 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000012895 dilution Substances 0.000 claims description 10
- 238000010790 dilution Methods 0.000 claims description 10
- FDWREHZXQUYJFJ-UHFFFAOYSA-M gold monochloride Chemical compound [Cl-].[Au+] FDWREHZXQUYJFJ-UHFFFAOYSA-M 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 9
- 230000002829 reductive effect Effects 0.000 claims description 8
- 238000003556 assay Methods 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 6
- 238000003483 aging Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 5
- RJHLTVSLYWWTEF-UHFFFAOYSA-K gold trichloride Chemical compound Cl[Au](Cl)Cl RJHLTVSLYWWTEF-UHFFFAOYSA-K 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000002253 acid Substances 0.000 abstract description 26
- 238000001514 detection method Methods 0.000 abstract description 13
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- 239000002105 nanoparticle Substances 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 11
- 229910052681 coesite Inorganic materials 0.000 abstract 5
- 229910052906 cristobalite Inorganic materials 0.000 abstract 5
- 239000000377 silicon dioxide Substances 0.000 abstract 5
- 235000012239 silicon dioxide Nutrition 0.000 abstract 5
- 229910052682 stishovite Inorganic materials 0.000 abstract 5
- 229910052905 tridymite Inorganic materials 0.000 abstract 5
- 238000012512 characterization method Methods 0.000 abstract 1
- 235000006708 antioxidants Nutrition 0.000 description 65
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 30
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 18
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 description 17
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- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 17
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- 238000002835 absorbance Methods 0.000 description 10
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- 229960004889 salicylic acid Drugs 0.000 description 9
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 7
- QRMZSPFSDQBLIX-UHFFFAOYSA-N homovanillic acid Chemical compound COC1=CC(CC(O)=O)=CC=C1O QRMZSPFSDQBLIX-UHFFFAOYSA-N 0.000 description 6
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- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
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- RODXRVNMMDRFIK-UHFFFAOYSA-N scopoletin Chemical compound C1=CC(=O)OC2=C1C=C(OC)C(O)=C2 RODXRVNMMDRFIK-UHFFFAOYSA-N 0.000 description 4
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- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- XEHFSYYAGCUKEN-UHFFFAOYSA-N Dihydroscopoletin Natural products C1CC(=O)OC2=C1C=C(OC)C(O)=C2 XEHFSYYAGCUKEN-UHFFFAOYSA-N 0.000 description 2
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- GMGIWEZSKCNYSW-UHFFFAOYSA-N 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxychromen-4-one;dihydrate Chemical compound O.O.C=1C(O)=CC(O)=C(C(C=2O)=O)C=1OC=2C1=CC=C(O)C(O)=C1 GMGIWEZSKCNYSW-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a gold nanoshell-based method for determining the capability of an antioxidant for clearing H2O2, which comprises the following steps: mixing gold nanoparticles (GNPs) with an aminated SiO2 colloidal solution to obtain SiO2/GNPs composite particles by the action of electrostatic adsorption, wherein the H2O2 can reduce chloroauric acid into gold nanoparticles which depositon the surfaces of the SiO2/GNPs composite particles to form complete gold nanoshells, and if the antioxidants with different concentrations are firstly mixed with the H2O2 for reaction, after the residual H2O2 reduces the chloroauric acid, only incompletely coated gold nanoshells can be formed; carrying out characterization on the SiO2/GNPs composite particles and the gold nanoshells with different coating degrees by an ultraviolet/visible light spectrophotometer; comparing the maximum absorption wavelengths of the SiO2/GNPs composite particles and the gold nanoshells to obtain the clearancerates of the antioxidants with different concentrations on the H2O2; and using the reciprocal of the concentration as the magnitude of the capability for clearing the H2O2. The invention is based on the change of optical properties in the growing process of the SiO2/GNPs composite particles, and has simple operation and high detection sensitivity.
Description
Technical field
The invention belongs to the nano biological analysis technical field, particularly a kind of antioxidant for clearing H based on gold nanoshell
2O
2The assay method of ability.
Background technology
Active oxygen species in the organism metabolism process (ROS) constantly produces by non-enzymatic reaction and enzymatic reaction, and under the normal physiological situation, generation and the removing of ROS are in mobile equilibrium, can keep gain everything and lose nothing extremely low-level.Owing to making organism metabolism, endogenous or exogenous stimulation produce a large amount of ROS unusually, or body polyphenoils deficiency, make between prooxidant/antioxidant balance not normal, then make body be in oxidative stress status, oxidable damage biomolecule, and further cause cell death and tissue damage, relevant with a lot of lysises.This shows that antioxidant is that it is maintained a reduced levels for the removing ability of ROS, can not produce the important investigation index of health threat human body.H
2O
2Be a kind of important active oxygen species, it can produce by multiple peroxisome under the Human Physiology condition, as glucose oxidase, D-amino acid oxidase etc.In addition, superoxide radical also can produce H under the catalytic action of hepatocuprein
2O
2H
2O
2And ultra-oxygen anion free radical (O
2 -) can cause cellular damage together, and further be transformed into other ROS, as hydroxy radical (OH) etc.H
2O
2Important component part as active oxygen species, antioxidant is to estimate the important indicator to health and health-care efficacy such as vegetables, fruit and health products to its size of removing ability, also is simultaneously the important indicator of vegetables, fruit and health products quality assessment in production and preservation process.At present, existing evaluation antioxidant for clearing H
2O
2The method of ability mainly comprises following several: (1) utilizes H
2O
2This is in the uv absorption phenomenon at 230nm place, and when having antioxidant, its absorption peak strength obviously weakens.But, just reduced the accuracy of this detection method because also might there be absorption peak in testing sample at this wavelength place.(2) H
2O
2Can under the effect of horseradish peroxidase, scopoletin be oxidized to a kind of non-fluorescence-causing substance, when there being H
2O
2During scavenger, the oxidation of scopoletin is suppressed, and this removing ability can detect by fluorophotometer.Another kind of widely used fluorophotometric method based on homovanillic acid (HVA) at H
2O
2Form a kind of stable biphenyl dimer down with the effect of horseradish peroxidase with fluorescent effect, and H
2O
2The existence of scavenger can hinder the oxidation of HVA.This class is direct and H based on the method for peroxidase for antioxidant
2O
2Reaction or and H
2O
2Act on mutually with the intermediate product of enzyme reaction and can not make clear and definite judgement.In addition, some antioxidant itself promptly is the substrate of peroxidase as ascorbic acid, quercetin dihydrate, mercaptan etc., removes H for it so
2O
2Ability also can produce wrong evaluation.(3) a kind of peroxide oxalic acid lipid chemiluminescence detecting method of non-enzyme.This method is utilized H
2O
2Form a kind of high-octane intermediate product dioxetanedione with the oxidation of the fragrant oxalic acid fat of imidazoles catalysis, it gives fluorophore 9 with NE BY ENERGY TRANSFER again, 10-diphenylanthracene, the process that this fluorophore is got back to ground state from excited state promptly gives off energy with the form of light.In reaction system, exist and remove H
2O
2Compound the time, this chemiluminescence reaction will be suppressed, and can come detection by quantitative by photofluorometer.This reaction is carried out in nonpolar environment, so this method is used to detect lipophilic antioxidant removing H usually
2O
2Ability.The major defect of this method is to be used as 9 of fluorophore, and 10-diphenylanthracene is a kind of carcinogenic substance.
Summary of the invention
The purpose of this invention is to provide a kind of easy and simple to handle and antioxidant for clearing H that detection sensitivity is high based on gold nanoshell
2O
2The assay method of ability.
The present invention adopts following technical scheme:
Mensuration antioxidant for clearing H of the present invention
2O
2The method of ability is promptly utilized at H
2O
2Add behind the antioxidant variation of spectral quality in the mediation gold nanoshell formation system and measure antioxidant for clearing H
2O
2Ability.
Mensuration antioxidant for clearing H of the present invention
2O
2The method of ability, that is:
1. amination SiO
2Colloid micro ball, ADSORPTION OF GOLD nano particle (GNPs) forms SiO again
2/ GNPs composite particles.
2. choice reaction system final concentration is the H of 200 μ M
2O
2Antioxidant hybrid reaction with variable concentrations adds SiO again
2/ GNPs composite particles and gold chloride, SiO
2/ GNPs composite particles concentration is 6.7 * 10
-11M, gold chloride concentration is 3.3 * 10
-4M mixes and stirs.
3. utilize and add SiO in the mixed liquor of antioxidant front and back
2Antioxidant for clearing H is calculated in the variation of/GNPs composite particles spectral quality
2O
2Ability.
The present invention is concrete to adopt following technical scheme to solve the technical matters that is proposed:
A kind of antioxidant for clearing H based on gold nanoshell
2O
2The assay method of ability, step is:
1. with gold nano grain and amidized SiO
2Colloidal solution mixes, stirs, and the amount of added gold nano grain should make gold nano grain at amidized SiO
2The coverage rate calculated value on bead surface is no less than 30%, and gold nano grain is adsorbed in amidized SiO by electrostatic adsorption
2Colloidal grain surface gets SiO
2/ GNPs composite particles aqueous solution is to SiO
2After/GNPs composite particles aqueous solution is carried out centrifugal treating, remove the gold nano grain that the upper strata is not adsorbed, again the SiO after removing the gold nano grain that is not adsorbed
2Add the pure water dilution in the/GNPs composite particles aqueous solution, and make precipitation be scattered in the SiO that obtains purifying in the pure water
2/ GNPs composite particles, SiO
2The SiO of/GNPs composite particles after dilution
2Concentration in the/GNPs composite particles aqueous solution is 2 * 10
10Individual/mL～2 * 10
12Individual/mL;
2. in the phosphate buffered solution of 0.01M, add sal tartari and be 1% chlorauric acid solution as the stabilizing agent of reaction system and mass volume ratio concentration, volume mL, the quality mg of phosphate buffered solution, sal tartari and chlorauric acid solution, volume mL ratio are 20～500: 5～125: 0.3～7.5, stir, in 4 ℃ of ageings 24h at least, obtain the chlorauric acid solution that sal tartari is made stabilizing agent;
3. in the phosphate buffered solution of 0.01M, add antioxidant and H to be detected
2O
2, (antioxidant to be detected volumetric molar concentration in reaction system is 3 μ M～1200 μ M, H
2O
2Volumetric molar concentration in reaction system is 50 μ M～500 μ M), phosphate buffered solution, antioxidant and H to be detected
2O
2Volume ratio be 0.6～15: 0.02～0.5: 0.04～1, after mixing and reacting 1～5min, again to wherein adding SiO
2The sal tartari of/GNPs composite particles aqueous solution and step 2 gained is done the chlorauric acid solution of stabilizing agent, at this moment SiO
2The whole volumetric molar concentration of/GNPs composite particles in reaction system is 1.34 * 10
-11M～13.4 * 10
-11M, the whole volumetric molar concentration of gold chloride is 0.66 * 10
-4M～6.6 * 10
-4M, reaction 2～20min, remaining H
2O
2Gold chloride is reduced into gold nano grain and is deposited on SiO
2/ GNPs composite particles surface forms and coats incomplete gold nanoshell; The incomplete gold nanoshell of coating that above-mentioned reaction is formed characterizes under ultraviolet spectrophotometer, and record coats the maximum absorption wavelength of incomplete gold nanoshell aqueous solution, is designated as W
1In the time of will not adding antioxidant by same concentrations H
2O
2The maximum absorption wavelength of the gold nanoshell aqueous solution for preparing is designated as W; To not add antioxidant and H
2O
2The time same concentrations SiO
2The maximum absorption wavelength of/GNPs composite particles aqueous solution is designated as W
0, pass through formula
The antioxidant that calculates this concentration is to H
2O
2Clearance rate percentage;
4. calculate the antioxidant of gained to H according to step 3
2O
2The clearance rate numerical values recited, by increasing and/or reduce the concentration of antioxidant, obtain being no less than the antioxidant of 4 variable concentrations, respectively repeat steps 3, calculate under the variable concentrations antioxidant to H
2O
2Clearance rate, with resulting antioxidant to H
2O
2Clearance rate in minimum value be that lower limit, maximal value are the upper limit, constitute antioxidant to H
2O
2The clearance rate scope, if antioxidant is to H
2O
2The clearance rate scope can not cover the IC of antioxidant
50Value, i.e. antioxidant for clearing 50%H
2O
2Needed concentration, then repeating step 4, up to IC
50Value falls into antioxidant to H
2O
2The clearance rate scope;
5. the antioxidant that obtains according to step 3-step 4 is to H
2O
2The clearance rate data, adopt the ORIGIN mapping software, draw out H
2O
2The relation curve of clearance rate and corresponding antioxidant concentration, and to read clearance rate from figure be that the concentration of 50% o'clock antioxidant is c, unit is M, c is the IC of selected antioxidant
50Value is got inverse with c, and promptly 1/c is antioxidant for clearing H
2O
2The size of ability, unit is M
-1
Compared with prior art, the present invention has following advantage:
1. the present invention can finish under the operation of ultraviolet-visible spectrophotometer, and is easy and simple to handle, do not need complicated instrument and equipment.
2. do not relate to enzyme reaction in the experimental implementation process, experimental principle is clear and definite, does not also relate to poisonous and harmful carcinogen etc., can not produce any damaging effect for environment and human body.
3. experimental cost is low, and required reagent is the common reagent in laboratory, nano material easy to prepare, and single reaction only needs a few minutes to finish, and the running time is short.
4. among the present invention the plasmon resonance absorption peak wavelength of gold nanoshell is used for detection signal, with absorbance was compared as the method for optically measuring of detection signal in the past, spike length migrates near infrared region from visible region, the migration amount is big, detect sensitively more, detect the example as can be seen from Fig. 4 tannic acid of Figure of description, from the spectrum change of a～g, the spike length of absorption peak has been moved about 220nm, and the migration value of absorbance has only 0.523.
Since the peak wavelength change corresponding to the significant change of solution colour, and before with in the method for absorbance as detection signal, it is not obvious that solution colour changes, so this method also can be used in the visual qualitatively detection.
6. the present invention all is suitable for for water-soluble and fat-soluble antioxidant, and sensing range is extensive.
Description of drawings
Fig. 1 is the experimentation principle schematic.
Fig. 2 is antioxidant for clearing H
2O
2The ability schematic diagram calculation.
Fig. 3 is that 6 kinds of antioxidants are to H
2O
2Clearance rate and concentration relationship curve map.
Fig. 4 is the ultraviolet-visible light spectrogram (a:SiO behind the adding variable concentrations tannic acid in the reaction system
2/ GNPs, b-g: tannic acid concentration reduces successively from 200 μ M～0 μ M).
Fig. 5 is (a) SiO
2The TEM of/GNPs composite particles figure and (b)-(d) be to add SiO behind the variable concentrations tannic acid in the reaction system
2The TEM figure of/GNPs composite particles growth conditions, (b) 200 μ M, (c) 25 μ M, (d) 0 μ M.
Fig. 6 is the experimental procedure synoptic diagram.
Embodiment
A kind of antioxidant for clearing H based on gold nanoshell
2O
2The assay method of ability, step is:
1. with gold nano grain and amidized SiO
2Colloidal solution mixes, stirs, and the amount of added gold nano grain should make gold nano grain at amidized SiO
2The coverage rate calculated value on bead surface is no less than 30%, and for example: present embodiment selects 30%, 50%, 70%, 90% respectively, and gold nano grain is adsorbed in amidized SiO by electrostatic adsorption
2Colloidal grain surface gets SiO
2/ GNPs composite particles aqueous solution is to SiO
2After/GNPs composite particles aqueous solution is carried out centrifugal treating, remove the gold nano grain that the upper strata is not adsorbed, again the SiO after removing the gold nano grain that is not adsorbed
2Add the pure water dilution in the/GNPs composite particles aqueous solution, and make precipitation be scattered in the SiO that obtains purifying in the pure water
2/ GNPs composite particles, SiO
2The SiO of/GNPs composite particles after dilution
2Concentration in the/GNPs composite particles aqueous solution is 2 * 10
10Individual/mL～2 * 10
12Individual/mL, for example, present embodiment is diluted to 2 * 10 respectively
10Individual/mL, 1 * 10
11Individual/mL, 5 * 10
11Individual/mL, 2 * 10
12Individual/mL;
2. in the phosphate buffered solution of 0.01M, add sal tartari and be 1% chlorauric acid solution as the stabilizing agent of reaction system and mass volume ratio concentration, phosphate buffered solution, the volume mL of sal tartari and chlorauric acid solution, quality mg, volume mL ratio is 20～500: 5～125: 0.3～7.5, for example, present embodiment is selected 20: 5: 0.3 respectively, 100: 25: 1.5,200: 75: 5,500: 125: 7.5, stir, in 4 ℃ of ageings 24h at least, for example, present embodiment is selected 24h respectively, 36h, 48h, 60h obtains the chlorauric acid solution that sal tartari is made stabilizing agent;
3. in the phosphate buffered solution of 0.01M, add antioxidant and H to be detected
2O
2, (antioxidant to be detected volumetric molar concentration in reaction system is 3 μ M～1200 μ M, and for example, present embodiment is selected 3 μ M, 200 μ M, 500 μ M, 1200 μ M, H respectively
2O
2Volumetric molar concentration in reaction system is 50 μ M～500 μ M, and for example, present embodiment is selected 50 μ M, 100 μ M, 200 μ M, 500 μ M respectively), phosphate buffered solution, antioxidant and H to be detected
2O
2Volume ratio be 0.6～15: 0.02～0.5: 0.04～1, for example, present embodiment is selected 0.6: 0.02: 0.04 respectively, 1: 0.1: 0.06,3: 0.2: 0.1,15: 0.5: 1, after mixing and reacting 1～5min, for example, present embodiment is selected 1min, 2min, 3min respectively, 5min is again to wherein adding SiO
2The sal tartari of/GNPs composite particles aqueous solution and step 2 gained is done the chlorauric acid solution of stabilizing agent, at this moment SiO
2The whole volumetric molar concentration of/GNPs composite particles in reaction system is 1.34 * 10
-11M～13.4 * 10
-11M, for example, present embodiment selects 1.34 * 10 respectively
-11M, 5 * 10
-11M, 10 * 10
-11M, 13.4 * 10
-11M, the whole volumetric molar concentration of gold chloride is 0.66 * 10
-4M～6.6 * 10
-4M, for example, present embodiment selects 0.66 * 10 respectively
-4M, 2 * 10
-4M, 4 * 10
-4M, 6.6 * 10
-4M, reaction 2～20min, for example, present embodiment is selected 2min respectively, 5min, 10min, 20min, remaining H
2O
2Gold chloride is reduced into gold nano grain and is deposited on SiO
2/ GNPs composite particles surface forms and coats incomplete gold nanoshell; The incomplete gold nanoshell of coating that above-mentioned reaction is formed characterizes under ultraviolet spectrophotometer, and record coats the maximum absorption wavelength of incomplete gold nanoshell aqueous solution, is designated as W
1In the time of will not adding antioxidant by same concentrations H
2O
2The maximum absorption wavelength of the gold nanoshell aqueous solution for preparing is designated as W; To not add antioxidant and H
2O
2The time same concentrations SiO
2The maximum absorption wavelength of/GNPs composite particles aqueous solution is designated as W
0, pass through formula
The antioxidant that calculates this concentration is to H
2O
2Clearance rate percentage;
4. calculate the antioxidant of gained to H according to step 3
2O
2The clearance rate numerical values recited, by increasing and/or reduce the concentration of antioxidant, obtain being no less than the antioxidant of 4 variable concentrations, respectively repeat steps 3, calculate under the variable concentrations antioxidant to H
2O
2Clearance rate, with resulting antioxidant to H
2O
2Clearance rate in minimum value be that lower limit, maximal value are the upper limit, constitute antioxidant to H
2O
2The clearance rate scope, between 0-100%, if antioxidant is to H
2O
2The clearance rate scope can not cover the IC of antioxidant
50Value, then repeating step 4, up to IC
50Value falls into antioxidant to H
2O
2The clearance rate scope;
5. the antioxidant that obtains according to step 3-step 4 is to H
2O
2The clearance rate data, adopt the ORIGIN mapping software, draw out H
2O
2The relation curve of clearance rate and corresponding antioxidant concentration, and to read clearance rate from figure be that the concentration of 50% o'clock antioxidant is c, unit is M, c is the IC of selected antioxidant
50Value is got inverse with c, and promptly 1/c is antioxidant for clearing H
2O
2The size of ability, unit is M
-1
Embodiment 2
1. the preparation of gold nano grain (GNPs)
Utilize the method for reduction gold chloride to prepare gold nano grain.The 1g gold chloride is dissolved in the 100mL pure water, gets 1% aqueous solution of chloraurate, 4 ℃ of refrigerations.Get the pure water of 200mL precooling, adding 3mL concentration and be 1% aqueous solution of chloraurate and 1mL concentration is the wet chemical of 0.2M, stirring and evenly mixing, again to wherein adding the sodium borohydride aqueous solution that 9mL concentration is 0.5mg/mL rapidly, mixed solution becomes claret by dark brown, promptly gets the gold nano grain of particle diameter about 5nm.Stir 10min again, the gold nano grain aqueous solution for preparing is placed 4 ℃ of stored refrigerated.
2.SiO
2The amination of colloid
Get the SiO that 40mL concentration is 0.013g/mL
2Alcosol, to the γ-An Jibingjisanyiyangjiguiwan that wherein adds 60 μ L (APTES), in 70 ℃ of following stirring reaction 3h, reaction places centrifuge tube with above-mentioned solution after finishing, and with the centrifugal 20min of 10000rpm, gets bottom SiO
2Solute adds the ultrasonic dispersion of absolute ethyl alcohol, and above step repeats 3 times, to remove unnecessary APTES.
3.SiO
2The preparation of/GNPs composite particles
Get the amidized SiO of 500 μ L
2Alcosol adds the dilution of 20mL absolute ethyl alcohol, with the SiO after the dilution
2Alcosol dropwise adds in the 200mL gold nano grain, and about 30min drips off, and constantly stirs, and electronegative gold nano grain is adsorbed in positively charged SiO by electrostatic interaction
2The bead surface forms SiO
2/ GNPs composite particles after continuing to stir 1h, places centrifuge tube with above-mentioned mixed liquor, with the centrifugal 20min of 3000rpm, gets bottom SiO
2/ GNPs composite particles adds the ultrasonic dispersion of pure water, and above step repeats 3 times, gets the SiO of purifying
2/ GNPs composite particles aqueous solution.
4.K
2CO
3/ HAuCl
4The preparation of mixed solution
Get the phosphate buffered solution that 100mL concentration is 0.01M, to wherein adding 25mg K
2CO
3, stir 10min, be 1% chlorauric acid solution to wherein adding 1.5mL concentration again, stir 20min and be placed on 4 ℃ of ageings and use behind the 24h at least.
5. forulic acid is removed H
2O
2The mensuration of ability
Get the phosphate buffered solution that 3mL concentration is 0.01M, to wherein adding 0.1mLH
2O
2With 0.2mL forulic acid, H
2O
2Final concentration in reaction system is 200 μ M, and the final concentration of forulic acid in reaction system is 3 μ M, stirs 2min, more respectively to wherein adding 0.5mL SiO
2/ GNPs composite particles aqueous solution and 3mL K
2CO
3/ HAuCl
4Mixed solution, reaction 5min, remaining H
2O
2Gold chloride is reduced into gold nano grain and is deposited on SiO
2/ GNPs composite particles surface forms and coats incomplete gold nanoshell.Reaction back solution characterizes with ultraviolet-visible spectrophotometer, and maximum absorption wavelength is designated as W
1The reference experiment replaces with the phosphate buffered solution that 0.2mL concentration is 0.01M with the forulic acid of 0.2mL, and all the other are constant, by same concentrations H
2O
2The maximum absorption wavelength of the gold nanoshell aqueous solution for preparing is designated as W.Control experiment is with the H of 0.1mL
2O
2Replace with the phosphate buffered solution that 0.3mL concentration is 0.01M with the forulic acid of 0.2mL, all the other are constant, record same concentrations SiO
2The maximum absorption wavelength of/GNPs composite particles aqueous solution is W
0Utilize formula
The forulic acid that calculates 3 μ M is to H
2O
2Clearance rate percentage be 14.3%.
Increase the concentration of forulic acid, make its final concentration in reaction system be respectively 5 μ M, 10 μ M, 50 μ M, 100 μ M.All the other operation stepss are the same, calculate 5 μ M, 10 μ M, and 50 μ M, the forulic acid of 100 μ M is to H
2O
2Clearance rate percentage be respectively 27.4%, 65.9%, 83.4%, 90.1%.
6. the variable concentrations forulic acid that obtains according to above-mentioned experiment is to H
2O
2The clearance rate data, adopt the ORIGIN mapping software, draw out H
2O
2The relation curve of clearance rate and corresponding forulic acid concentration, and to read clearance rate from figure be that the concentration of 50% o'clock forulic acid is 8 μ M, the i.e. IC of forulic acid
50Value is 8 μ M, with IC
50Value is got inverse, gets 12.5 * 10
-2μ M
-1, be forulic acid and remove H
2O
2The size of ability.
Embodiment 3
1. with embodiment 2 steps 1.
2. with embodiment 2 steps 2.
3. with embodiment 2 steps 3.
4. with embodiment 2 steps 4.
5. tartrate is removed H
2O
2The mensuration of ability
Selecting the final concentration of tartrate in reaction system is 1200 μ M, and all the other experimental implementation steps are with embodiment 2 steps 5, and the tartrate that calculates 1200 μ M is to H
2O
2Clearance rate percentage be 92.5%.Reduce tartaric concentration, make its final concentration in reaction system be respectively 800 μ M, 400 μ M, 200 μ M, 50 μ M.Repeat above operation steps, calculate 800 μ M, 400 μ M, 200 μ M, the tartrate of 50 μ M is to H
2O
2Clearance rate percentage be respectively 90.1%, 62.9%, 36.7%, 9.1%.
6. the variable concentrations tartrate that obtains according to above-mentioned experiment is to H
2O
2The clearance rate data, adopt the ORIGIN mapping software, draw out H
2O
2The relation curve of clearance rate and corresponding tartaric acid concentration, and to read clearance rate from figure be that 50% o'clock tartaric concentration is 273 μ M, promptly tartaric IC
50Be 273 μ M, with IC
50Value is got inverse, gets 0.36 * 10
-2μ M
-1, be tartrate and remove H
2O
2The size of ability.
Embodiment 4
1. with embodiment 2 steps 1.
2. with embodiment 2 steps 2.
3. with embodiment 2 steps 3.
4. with embodiment 2 steps 4.
5. citric acid is removed H
2O
2The mensuration of ability
Selecting the final concentration of citric acid in reaction system is 100 μ M, and all the other experimental implementation steps are with embodiment 2 steps 5, and the citric acid that calculates 100 μ M is to H
2O
2Clearance rate percentage be 48.7%.Increase, reduce the concentration of citric acid, make its final concentration in reaction system be respectively 400 μ M, 150 μ M, 20 μ M, 5 μ M.Repeat above operation steps, calculate 400 μ M, 150 μ M, 20 μ M, the citric acid of 5 μ M is to H
2O
2Clearance rate percentage be respectively 92.7%, 76.1%, 22.2%, 3.4%.
6. the variable concentrations citric acid that obtains according to above-mentioned experiment is to H
2O
2The clearance rate data, adopt the ORIGIN mapping software, draw out H
2O
2The relation curve of clearance rate and corresponding citric acid concentration, and to read clearance rate from figure be that the concentration of 50% o'clock citric acid is 106 μ M, the i.e. IC of citric acid
50Be 106 μ M, with IC
50Value is got inverse, gets 0.94 * 10
-2μ M
-1, be citric acid and remove H
2O
2The size of ability.
Embodiment 5
1. with embodiment 2 steps 1.
2. with embodiment 2 steps 2.
3. with embodiment 2 steps 3.
4. with embodiment 2 steps 4.
5. salicylic acid is removed H
2O
2The mensuration of ability
Selecting the final concentration of salicylic acid in reaction system is 10 μ M, and all the other experimental implementation steps are with embodiment 2 steps 5, and the salicylic acid that calculates 10 μ M is to H
2O
2Clearance rate percentage be 1.2%.Increase salicylic concentration, make its final concentration in reaction system be respectively 20 μ M, 50 μ M, 100 μ M, 200 μ M.Repeat above operation steps, calculate 20 μ M, 50 μ M, 100 μ M, the salicylic acid of 200 μ M is to H
2O
2Clearance rate percentage be respectively 3.2%, 7.6%, 12.3%, 21.8%.
Salicylic acid is to H
2O
2The clearance rate scope do not cover IC
50Value, continuing increases salicylic concentration, makes its final concentration in reaction system be respectively 400 μ M, 600 μ M, 800 μ M repeat above experimental implementation step, calculate 400 μ M, 600 μ M, the salicylic acid of 800 μ M is to H
2O
2Clearance rate percentage be respectively 45.3%, 68.7%, 90.5%.
6. the variable concentrations salicylic acid that obtains according to above-mentioned experiment is to H
2O
2The clearance rate data, adopt the ORIGIN mapping software, draw out H
2O
2The relation curve of clearance rate and corresponding salicylic acid concentration, and to read clearance rate from figure be that 50% o'clock salicylic concentration is 470 μ M, promptly salicylic IC
50Be 470 μ M, with IC
50Value is got inverse, gets 0.21 * 10
-2μ M
-1, be salicylic acid and remove H
2O
2The size of ability.
Embodiment 6
1. with embodiment 2 steps 1.
2. with embodiment 2 steps 2.
3. with embodiment 2 steps 3.
4. with embodiment 2 steps 4.
5. tannic acid is removed H
2O
2The mensuration of ability
Selecting the final concentration of tannic acid in reaction system is 200 μ M, and all the other experimental implementation steps are with embodiment 2 steps 5, and the tannic acid that calculates 200 μ M is to H
2O
2Clearance rate percentage be 88.1%.Reduce the concentration of tannic acid, make its final concentration in reaction system be respectively 100 μ M, 50 μ M, 25 μ M, 10 μ M.Repeat above operation steps, calculate 100 μ M, 70 μ M, 50 μ M, the tannic acid of 25 μ M is to H
2O
2Clearance rate percentage be respectively 87.5%, 86.2%, 85.2%, 79.1%.Tannic acid is to H
2O
2The clearance rate scope do not cover IC
50Be worth, continue to reduce the concentration of tannic acid, make its final concentration in reaction system be respectively 10 μ M, 5 μ M, 3 μ M repeat above experimental implementation step, calculate 10 μ M, 5 μ M, the tannic acid of 3 μ M is to H
2O
2Clearance rate percentage be respectively 64.7%, 53.3%, 38.6%.
6. the variable concentrations tannic acid that obtains according to above-mentioned experiment is to H
2O
2The clearance rate data, adopt the ORIGIN mapping software, draw out H
2O
2The relation curve of clearance rate and corresponding tannic acid concentration, and to read clearance rate from figure be that the concentration of 50% o'clock tannic acid is 7 μ M, the i.e. IC of tannic acid
50Be 7 μ M, with IC
50Value is got inverse, gets 14.28 * 10
-2μ M
-1, be tannic acid and remove H
2O
2The size of ability.
The checking example
1. the preparation of gold nano grain (GNPs)
Utilize the method for reduction gold chloride to prepare gold nano grain.The 1g gold chloride is dissolved in the 100mL pure water, gets 1% aqueous solution of chloraurate, 4 ℃ of refrigerations.Get the pure water of 200mL precooling, adding 3mL concentration and be 1% aqueous solution of chloraurate and 1mL concentration is the wet chemical of 0.2M, stirring and evenly mixing, again to wherein adding the sodium borohydride aqueous solution that 9mL concentration is 0.5mg/mL rapidly, mixed solution becomes claret by dark brown, promptly gets the gold nano grain of particle diameter about 5nm.Stir 10min again, the gold nano grain aqueous solution for preparing is placed 4 ℃ of stored refrigerated.
2.SiO
2The amination of colloid
Get the SiO that 40mL concentration is 0.013g/L
2Alcosol, to the γ-An Jibingjisanyiyangjiguiwan that wherein adds 60 μ L (APTES), in 70 ℃ of following stirring reaction 3h, reaction places centrifuge tube with above-mentioned solution after finishing, and with the centrifugal 20min of 10000rpm, gets bottom SiO
2Solute adds the ultrasonic dispersion of absolute ethyl alcohol, and above step repeats 3 times, to remove unnecessary APTES.
3.SiO
2The preparation of/GNPs composite particles
Get the amidized SiO of 500 μ L
2Alcosol adds the dilution of 20mL absolute ethyl alcohol, with the SiO after the dilution
2Alcosol dropwise adds in the 200mL gold nano grain, and about 30min drips off, and constantly stirs, and electronegative gold nano grain is adsorbed in positively charged SiO by electrostatic interaction
2The bead surface forms SiO
2/ GNPs composite particles after continuing to stir 1h, places centrifuge tube with above-mentioned mixed liquor, with the centrifugal 20min of 3000rpm, gets bottom SiO
2/ GNPs composite particles adds the ultrasonic dispersion of pure water, and above step repeats 3 times, gets the SiO of purifying
2/ GNPs composite particles aqueous solution.
4.K
2CO
3/ HAuCl
4The preparation of mixed solution
Get the phosphate buffered solution that 100mL concentration is 0.01M, to wherein adding 25mg K
2CO
3, stir 10min, be 1% chlorauric acid solution to wherein adding 1.5mL concentration again, stir 20min and be placed on 4 ℃ of ageings and use behind the 24h at least.
5. forulic acid is removed H
2O
2The mensuration of ability
Get the phosphate buffered solution that 3mL concentration is 0.01M, to wherein adding 0.1mLH
2O
2With 0.2mL forulic acid, H
2O
2Final concentration in reaction system is 200 μ M, and the final concentration of forulic acid in reaction system is followed successively by 3 μ M, 5 μ M, and 10 μ M, 50 μ M, 100 μ M stir 2min, more respectively to wherein adding 0.5mL SiO
2/ GNPs composite particles aqueous solution and 3mL K
2CO
3/ HAuCl
4Mixed solution, reaction 5min, remaining H
2O
2Gold chloride is reduced into gold nano grain and is deposited on SiO
2/ GNPs composite particles surface forms and coats incomplete gold nanoshell.Reaction back solution characterizes with ultraviolet-visible spectrophotometer, and maximum absorption wavelength is designated as W
1The reference experiment replaces with the phosphate buffered solution that 0.2mL concentration is 0.01M with the forulic acid of 0.2mL, and all the other are constant, by same concentrations H
2O
2The maximum absorption wavelength of the gold nanoshell aqueous solution for preparing is designated as W.Control experiment is with the H of 0.1mL
2O
2Replace with the phosphate buffered solution that 0.3mL concentration is 0.01M with the forulic acid of 0.2mL, all the other are constant, record same concentrations SiO
2The maximum absorption wavelength of/GNPs composite particles aqueous solution is W
0Utilize formula
Calculate 3 μ M, 5 μ M, 10 μ M, 50 μ M, the forulic acid of 100 μ M concentration is to H
2O
2Clearance rate percentage.
The pairing clearance rate percentage of each forulic acid concentration is utilized ORIGIN mapping software curve plotting, shown in forulic acid data and curves figure among Fig. 3 of Figure of description.But its corresponding detectable concentration scope, IC
50Value and H
2O
2Remove ability value shown in forulic acid data in the table 1.The IC of forulic acid
50Value and H
2O
2Remove ability value and be respectively 8 μ M and 12.5 * 10
-2μ M
-1
Existing a kind of employing peroxide oxalic acid lipid chemoluminescence method detects antioxidant for clearing H
2O
2The method of ability, this method detects principle and is: H
2O
2Can be under the effect of fluorophore the oxidation of a kind of fragrant oxalic acid lipoid substance be formed fragrant oxalic acid fat/fluorophore compound, in this process, give a kind of HEI with an electron transfer, then, this electronics is transferred to fluorophore again makes it be in a kind of high energy excited state, thereby produce the chemiluminescence phenomenon, luminous intensity can detect by fluorescence intensity, when containing antioxidant in the reaction system, and a part of H
2O
2Be eliminated, luminous intensity is suppressed.The forulic acid that utilizes this method to detect is removed 50%H
2O
2Needed concentration, i.e. IC
50Value is 10.37 μ M, H
2O
2Removing ability value is 9.7 * 10
-2μ M
-1Compare with our detection method, at first the detection principle of two kinds of detection methods is different, and it is luminous that existing method is based on chemi-excitation, and our method is based on the optical absorption characteristic of nano material; Secondly, concrete operations step and reaction conditions also are different fully, and the data that two kinds of methods draw can not be in full accord.Therefore, though final data result is variant, still within the variation range that experiment allows.The method that we are described is correct, effectively.
But table 16 kind of antioxidant detectable concentration scope, IC
50Value and H
2O
2Remove ability value
The contrast experiment:
1. this experimental technique: because we place SiO with the growth of gold nano grain
2The surface of bead has formed a kind of nano level nucleocapsid structure, and in the growth course of gold nano grain, except the variation of absorbance, wavelength also moves in the hundreds of nanometer range, and we adopt wavelength change as optical detector signal first, work as H
2O
2When the final concentration in reaction system changed between 0-200 μ M, wavelength had moved about 220nm, the H of promptly every variation 1 μ M
2O
2Concentration, the about 1.1nm of wavelength variations, during the parameter of general ultraviolet-visible spectrophotometer was provided with, the I of the resolution of wavelength reached 0.1nm, that is to say to be the H that can tell per 1 μ M fully if adopt wavelength as detection signal
2O
2The caused wavelength variations value of concentration.
2. existing method: with the gold nano grain for preparing as seed in solution for continuous growth, also adopt H
2O
2As the reductive agent of reaction system, existing method as optical detector signal, is worked as H with the variation of absorbance in the gold nano grain growth course in the experimental implementation
2O
2When the final concentration in reaction system changed between 0-600 μ M, it is about 0.55 that absorbance has changed, the H of promptly every variation 1 μ M
2O
2Concentration, the absorbance changing value is about 0.00092, and during the parameter of general ultraviolet-visible spectrophotometer was provided with, the I of the resolution of absorbance reached 0.001, that is to say to be the H that can't tell per 1 μ M if adopt absorbance as detection signal
2O
2The caused absorbance changing value of concentration.
Claims (1)
1. antioxidant for clearing H based on gold nanoshell
2O
2The assay method of ability is characterized in that, step is:
1) with gold nano grain and amidized SiO
2Colloidal solution mixes, stirs, and the amount of added gold nano grain should make gold nano grain at amidized SiO
2The coverage rate calculated value on bead surface is no less than 30%, and gold nano grain is adsorbed in amidized SiO by electrostatic adsorption
2Colloidal grain surface gets SiO
2/ GNPs composite particles aqueous solution is to SiO
2After/GNPs composite particles aqueous solution is carried out centrifugal treating, remove the gold nano grain that the upper strata is not adsorbed, again the SiO after removing the gold nano grain that is not adsorbed
2Add the pure water dilution in the/GNPs composite particles aqueous solution, and make precipitation be scattered in the SiO that obtains purifying in the pure water
2/ GNPs composite particles, SiO
2The SiO of/GNPs composite particles after dilution
2Concentration in the/GNPs composite particles aqueous solution is 2 * 10
10Individual/mL～2 * 10
12Individual/mL;
2) adding sal tartari in the phosphate buffered solution of 0.01M is 1% chlorauric acid solution as the stabilizing agent of reaction system and mass volume ratio concentration, volume mL, the quality mg of phosphate buffered solution, sal tartari and chlorauric acid solution, volume mL ratio are 20～500: 5～125: 0.3～7.5, stir, in 4 ℃ of ageings 24h at least, obtain the chlorauric acid solution that sal tartari is made stabilizing agent;
3) in the phosphate buffered solution of 0.01M, add antioxidant and H to be detected
2O
2, antioxidant to be detected whole volumetric molar concentration in reaction system is 3 μ M～1200 μ M, H
2O
2Whole volumetric molar concentration in reaction system is 50 μ M～500 μ M, phosphate buffered solution, antioxidant and H to be detected
2O
2Volume ratio be 0.6～15: 0.02～0.5: 0.04～1, after mixing and reacting 1～5min, again to wherein adding SiO
2/ GNPs composite particles aqueous solution and step 2) sal tartari of gained does the chlorauric acid solution of stabilizing agent, this moment SiO
2The whole volumetric molar concentration of/GNPs composite particles in reaction system is 1.34 * 10
-11M～13.4 * 10
-11M, the whole volumetric molar concentration of gold chloride is 0.66 * 10
-4M～6.6 * 10
-4M, reaction 2～20min, remaining H
2O
2Gold chloride is reduced into gold nano grain and is deposited on SiO
2/ GNPs composite particles surface forms and coats incomplete gold nanoshell; The incomplete gold nanoshell of coating that above-mentioned reaction is formed characterizes under ultraviolet spectrophotometer, and record coats the maximum absorption wavelength of incomplete gold nanoshell aqueous solution, is designated as W
1In the time of will not adding antioxidant by same concentrations H
2O
2The maximum absorption wavelength of the gold nanoshell aqueous solution for preparing is designated as W; To not add antioxidant and H
2O
2The time same concentrations SiO
2The maximum absorption wavelength of/GNPs composite particles aqueous solution is designated as W
0, pass through formula
The antioxidant that calculates this concentration is to H
2O
2Clearance rate percentage;
4) calculate the antioxidant of gained to H according to step 3)
2O
2The clearance rate numerical values recited, by increasing and/or reduce the concentration of antioxidant, obtain being no less than the antioxidant of 4 variable concentrations, respectively repeat steps 3), calculate under the variable concentrations antioxidant to H
2O
2Clearance rate, with resulting antioxidant to H
2O
2Clearance rate in minimum value be that lower limit, maximal value are the upper limit, constitute antioxidant to H
2O
2The clearance rate scope, if antioxidant is to H
2O
2The clearance rate scope can not cover the IC of antioxidant
50Value, then repeating step 4), up to IC
50Value falls into antioxidant to H
2O
2The clearance rate scope;
5) antioxidant that obtains according to step 3)-step 4) is to H
2O
2The clearance rate data, adopt the ORIGIN mapping software, draw out H
2O
2The relation curve of clearance rate and corresponding antioxidant concentration, and to read clearance rate from figure be that the concentration of 50% o'clock antioxidant is c, unit is M, c is the IC of selected antioxidant
50Value is got inverse with c, and promptly 1/c is antioxidant for clearing H
2O
2The size of ability, unit is M
-1
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| CN200910036204XA CN101661003B (en) | 2009-09-25 | 2009-09-25 | Gold nanoshell-based method for determining capability of antioxidant for clearing H2O2 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910036204XA CN101661003B (en) | 2009-09-25 | 2009-09-25 | Gold nanoshell-based method for determining capability of antioxidant for clearing H2O2 |
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| Publication Number | Publication Date |
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Citations (6)
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| US5395755A (en) * | 1990-06-12 | 1995-03-07 | British Technology Group Limited | Antioxidant assay |
| JP2000009650A (en) * | 1998-06-18 | 2000-01-14 | Sapporo Breweries Ltd | Method for evaluating anti-oxidation property of carbonated drink |
| JP2004233164A (en) * | 2003-01-29 | 2004-08-19 | Shizuoka Prefecture | Radical trapping ability evaluation method using light emitted from animal cell |
| CN1740789A (en) * | 2004-08-25 | 2006-03-01 | 中国科学院海洋研究所 | Research method for positioning antioxidant activity of chitosan sulfate |
| JP2008203088A (en) * | 2007-02-20 | 2008-09-04 | Aloka Co Ltd | Anti-oxidation ability evaluation method and anti-oxidation ability evaluation kit |
| CN101377471A (en) * | 2007-08-27 | 2009-03-04 | 英科新创(厦门)科技有限公司 | Electrochemical method for evaluating antioxidant ability of substance to be tested |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5395755A (en) * | 1990-06-12 | 1995-03-07 | British Technology Group Limited | Antioxidant assay |
| JP2000009650A (en) * | 1998-06-18 | 2000-01-14 | Sapporo Breweries Ltd | Method for evaluating anti-oxidation property of carbonated drink |
| JP2004233164A (en) * | 2003-01-29 | 2004-08-19 | Shizuoka Prefecture | Radical trapping ability evaluation method using light emitted from animal cell |
| CN1740789A (en) * | 2004-08-25 | 2006-03-01 | 中国科学院海洋研究所 | Research method for positioning antioxidant activity of chitosan sulfate |
| JP2008203088A (en) * | 2007-02-20 | 2008-09-04 | Aloka Co Ltd | Anti-oxidation ability evaluation method and anti-oxidation ability evaluation kit |
| CN101377471A (en) * | 2007-08-27 | 2009-03-04 | 英科新创(厦门)科技有限公司 | Electrochemical method for evaluating antioxidant ability of substance to be tested |
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