Summary of the invention
In order to solve above technical problem, the invention provides a kind of hyaluronic acid elastomer.It can be used as cosmetic material, for physics smooth out wrinkles, keeps moisture of skin, slow release functional component, improvement use sensation etc.
The present invention is achieved by the following measures:
A kind of hyaluronic acid elastomer, is obtained by following steps:
(1) hyaluronic acid and cross-linking agent are reacted, obtain cross-linking sodium hyaluronate gel A;
(2) select the screen cloth with suitable aperture, cross-linking sodium hyaluronate gel A is granulated, obtains the different gel B of size and gel C;
(3) by gel B and gel C mixing, again carry out cross-linking reaction, adjust ph is to neutral, and dialysis, obtains hyaluronic acid elastomer.
Described hyaluronic acid elastomer, preferred cross-linking agent is the one in carbodiimide, divinylsulfone, Ethylene glycol diglycidyl ether, BDDE, the many glycidyl ethers of polyglycereol.
Cross-linking reaction can be acid condition in step (3), pH value 2 ~ 6, more preferably 2 ~ 4, and also can be alkali condition, pH value 9 ~ 14, more preferably 11 ~ 14.
Described hyaluronic acid elastomer, in preferred steps (1), cross-linking agent and hyaluronic quality accounting are 0.02 ~ 3.0%.
Described hyaluronic acid elastomer, in preferred steps (3), gel B and gel C mixed proportion are 1-9:9-1.
Described hyaluronic acid elastomer, in preferred steps (1) (3), cross-linking reaction temperature is 10 DEG C ~ 60 DEG C, preferably 15 DEG C ~ 50 DEG C; Response time 1 ~ 50 h, preferably 2 ~ 24 h.
So the particle diameter (X of gel B
50) select 100 ~ 800 μm.
So the particle diameter (X of gel C
50) select 70 ~ 100 μm.
Hyaluronic acid sodium gel after crosslinked is made the gel that particle diameter varies in size by the present invention, then carries out two steps and be cross-linked, and different hyaluronic acid network structure is interted together, and gel has excellent rheologic behavio(u)r.
The present invention stops crosslinked being completed by dialysis removing cross-linking agent and unreacted small-molecule substance.
Object of the present invention additionally provides the purposes of this gel, and in cosmetics, physics smooth out wrinkles, keeps moisture of skin, slow release functional component.
This gel can be used for filling fine, moderate or deep wrinkles, and tissue filling.
This gel can be used for recovering skin beauty water balance by mesotherapy, improves skin texture and elasticity.
This gel can be used for supplementing or alternative synovial fluid.
A kind of or the wherein several combination in the additive of noncrosslinking hyaluronic acid, sunscreen, light protective agent, antioxidant, nutrient, vitamin, skin conditioning agent, irritated inhibitor, disinfectant, antiseptic, antimicrobial, antiparasitic, plant extract, special efficacy can be added in this gel.
According to embodiment of the present invention, this gel can sterilizing or add antiseptic, and moist heat sterilization mode is selected in sterilizing.
Beneficial effect of the present invention:
Hyaluronic acid elastomer of the present invention, be again cross-linked with the cross-linking sodium hyaluronate gel of two kinds of different-grain diameters, dosage of crosslinking agent is few, pollutes few, is easy to realize industrialization; Gel of the present invention has excellent rheologic behavio(u)r and biocompatibility, can physics smooth out wrinkles, keeps moisture of skin, slow release functional component, improves and use sensation.
Detailed description of the invention
In order to better the present invention is described, further illustrate below in conjunction with specific embodiment.
Embodiment 1
The gel B size difference that the present embodiment is investigated is on the impact of invention gelling properties, and preparation method is as follows:
(1) by 10 g hyaluronic acid dissolves in the NaOH solution of 100 ml (pH value is 11 ~ 13), after mixing, add cross-linking agent 1,4-butanediol diglycidyl ether, cross-linking agent and hyaluronic quality accounting are 1%, stirring and evenly mixing, reacts 6 h in 35 DEG C of water-baths, obtains cross-linking sodium hyaluronate gel A;
(2) granulated by cross-linking sodium hyaluronate gel A, the particle diameter of gel B is as shown in table 1, and the particle diameter of gel C is 72 μm of (X
50);
(3) gel B and gel C are pressed 1: 1(w: w) mix, adjust ph to 2 ~ 4, add BDDE, and cross-linking agent and hyaluronic quality accounting are react 8 h in 0.8%, 30 DEG C of water-baths.Adjust ph is to neutral, and dialysis removes unreacted small-molecule substance.
The viscoelasticity of the gel that the gel B comparing different-grain diameter prepares and resistance to enzymatic, assay method is as follows:
Viscoelasticity method of testing: match to write from memory flying generation that science and technology (China) company with Haake RS6000() Instrument measuring viscoelasticity, condition is: rotor: P20 Ti L; Gap value: 1.00 mm; Temperature: 25 DEG C; Mode determination; Oscillation frequency sweep CD; Stress; 1%; Frequency range: 0.01 ~ 1 Hz.Elastic modelling quantity when recording 0.1 Hz and viscous modulus.
Resistance to enzymatic: precision takes the gel obtained in embodiment, and (hyaluronic acid contents is 0.5 g), add 0.1 mol/L phosphate buffer (pH 7.0) 9 mL and hyaluronidase liquid (100 U/mL) 1 mL, mix homogeneously, be placed in 37 DEG C of water-bath enzymolysis 8 h, then boil 10 min deactivations at 100 DEG C.0.45 μm of filtering with microporous membrane, gets filtrate 1.0 ml, adds water and be settled to 10 ml.Adopt improvement carbazole development process (list of references: Bitter .T, Muir H.M, (1962) A modified uronic acid carbarbazole reation .Anal.Biochem.4,330-333.) measuring glucuronic acid content, after being multiplied by 2.07, converting the content a of cross-linking hyaluronic acid sodium in the sample for adding enzyme liquid; Cross-linking hyaluronic acid sodium content in not enzyme-added liquid sample is b, calculates enzymatic degradation rate=a/b × 100%.Enzymatic degradation rate is lower, and show that the ability of the slow release functional component of gel is stronger, the functional component maintainable time is long.
The impact of the gel B of table 1 different-grain diameter
Gel B selects viscoelasticity to be suitable for, and degradation rate is moderate.When the granule of gel B is greater than 800 μm, the resistance to enzymatic of final gained gel is poor, and effect is held time short, so the particle diameter of gel B selects 100 ~ 800 μm.
Embodiment 2
The gel C size difference that the present embodiment is investigated is on the impact of invention gelling properties, and preparation method is as follows:
(1) by 10 g hyaluronic acid dissolves in 100 ml NaOH solution in (pH value is 11 ~ 13), after mixing, add cross-linking agent 1,4-butanediol diglycidyl ether, cross-linking agent and hyaluronic quality accounting are 1.0%, stirring and evenly mixing, reacts 6 h in 35 DEG C of water-baths, obtains cross-linking sodium hyaluronate gel A;
(2) cross-linking sodium hyaluronate gel A is granulated, gel B particle diameter be 198 μm of (X
50), the particle diameter of gel C is as shown in table 2;
(3) gel B and gel C are pressed 1: 1(w: w) mix, adjust ph to 2 ~ 4, add BDDE, and cross-linking agent and hyaluronic quality accounting are react 8 h in 0.8%, 30 DEG C of water-baths.Adjust ph is to neutral, and dialysis removes unreacted small-molecule substance.
Reference example 1 method measures gel viscoelastisity and resistance to enzymatic, and data are in table 2.
The impact of the gel C of table 2 different-grain diameter
Gel C selects viscoelasticity to be suitable for, and degradation rate is moderate.When the granule of gel C is less than 60 μm, final gained gel elastomer is comparatively large, is difficult to smear, so the particle diameter (X of gel C
50) select 70 ~ 100 μm.
Embodiment 3
Gel B(198 μm by embodiment 2) and gel C (72 μm) with different quality than after mix homogeneously, pH value is transferred to 2 ~ 4, and add 1,4-butanediol diglycidyl ether, cross-linking agent and hyaluronic quality accounting are 0.8%(w/w), in 30 DEG C of water-baths, react 6 h, then adjust ph is to neutral, the unreacted small-molecule substance of dialysis removing.
Reference example 1 method measures gel viscoelastisity and resistance to enzymatic, and viscoelasticity test data is in table 3.
The ratio of table 3 gel X and gel Y
Can see from above-mentioned data, the ratio of gel B is larger, and enzymatic degradation rate is higher, and functional component discharges faster, elasticity and viscosity lower, be easy to smear; The ratio of gel C is larger, and enzymatic degradation rate is lower, and resistance to enzymatic is better, and functional component discharges slower.Suitable ratio can be selected according to functional component release time and viscoelastic needs.
Embodiment 4
The present embodiment investigates the impact of the crosslinker ratio that a step is cross-linked, and method is as follows:
(1) by 10 g hyaluronic acid dissolves in 100 ml NaOH solution in (pH value is 13 ~ 14), after mixing, add cross-linking agent divinylsulfone (DVS), cross-linking agent and hyaluronic mass ratio as shown in table 4, stirring and evenly mixing, in 25 DEG C of water-baths, react 8 h, obtain cross-linking sodium hyaluronate gel A;
(2) cross-linking sodium hyaluronate gel A is granulated, gel B particle diameter be 198 μm of (X
50), the particle diameter of gel C is 81 μm of (X
50);
(3) gel B and gel C are pressed 1: 1(w: w) mix, adjust ph to 11 ~ 12, add divinylsulfone (DVS), and cross-linking agent and hyaluronic acid mass ratio are react 30 h in 1.0%, 25 DEG C of water-baths.Adjust ph is to neutral, and dialysis removes unreacted small-molecule substance.
Table 4 one step is cross-linked the impact of crosslinker ratio
When the cross-linking agent that one step is crosslinked and hyaluronic acid mass ratio are 0.02 ~ 3.0%, the viscoelasticity of gel is moderate, and enzymatic degradation rate is adjustable; When cross-linking agent and hyaluronic acid mass ratio are less than 0.02%, the viscoelasticity of gel is very poor, and enzymatic degradation obtains very fast, so the crosslinked cross-linking agent of a step and hyaluronic acid mass ratio are decided to be 0.02 ~ 3.0%.
Embodiment 5
The present embodiment investigates the impact of the crosslinker ratio that two steps are cross-linked, and method is as follows:
(1) by 10 g hyaluronic acid dissolves in the NaOH solution of 100 ml (pH value is 13 ~ 14), after mixing, add cross-linking agent divinylsulfone (DVS), cross-linking agent and hyaluronic acid mass ratio are 1.0%, stirring and evenly mixing, reacts 8 h in 25 DEG C of water-baths, obtains cross-linking sodium hyaluronate gel A;
(2) cross-linking sodium hyaluronate gel A is granulated, gel B particle diameter be 198 μm of (X
50), the particle diameter of gel C is 81 μm of (X
50);
(3) by gel B and gel C by 1: 1(w: w) mix, adjust ph to 11 ~ 12, add divinylsulfone (DVS), cross-linking agent and hyaluronic mass ratio as shown in table 5, react 30 h in 25 DEG C of water-baths.Adjust ph is to neutral, and dialysis removes unreacted small-molecule substance.
Table 5 two step is cross-linked the impact of crosslinker ratio
When the cross-linking agent that two steps are crosslinked and hyaluronic acid mass ratio are 0.1 ~ 3.0%, the viscoelasticity of gel is moderate, and enzymatic degradation rate is adjustable; When cross-linking agent and hyaluronic acid mass ratio are less than 0.1%, the viscoelasticity of gel is very poor, and enzymatic degradation obtains very fast, so the crosslinked cross-linking agent of two steps and hyaluronic acid mass ratio are decided to be 0.1 ~ 3.0%.
Embodiment 6
The present embodiment investigates the elastomeric moisture retention of hyaluronic acid, and method is as follows:
Gel B(198 μm by embodiment 2) and gel C (72 μm) by 1: 1(w: w) after mix homogeneously, pH value is transferred to 2 ~ 4, and add 1,4-butanediol diglycidyl ether, cross-linking agent and hyaluronic acid mass ratio are 0.8%(w/w), in 15 DEG C of water-baths, react 30 h, then adjust ph is to neutral, and the unreacted small-molecule substance of dialysis removing obtains hyaluronic acid elastomer sample.
The sample of 5% and the HA solution of 0.1% is prepared respectively with the essence containing polyhydric alcohol, thickening agent and gels such as glycerol.Bend the pilot region of side labelling 5 4cm × 4cm at 10 left and right forearms of experimenter, smear the essence (w/w) containing 5% sample respectively, 0.1%HA essence (w/w) and contrast (essence), applying amount is 3.0 ± 0.1 mg/cm
2, be massaged into absorption of sample gently.Use moisture of skin analyzer and skin water loss analyzer to measure to smear front and skin moisture content after being coated with when 30min, 1h, 3h, 6h, 8h and 24h in each region and skin water loss amount.
Date processing (averaging):
Skin moisture content increment rate (%)=
× 100
Skin water loss increment rate (%)=
× 100
Hyaluronate sodium elastomer sample on the impact of skin moisture content in table 6, table 7.
Front and back skin moisture content increment rate (%) smeared by table 6
Result show, all sustainable 24h of the effect that 5% sample makes skin beauty water content increase, and moistening effect always than 0.1%HA and blank good.
Front and back moisture of skin windage increment rate (%) smeared by table 7
Result shows, and within 3 h, 5% sample solution effectively can suppress moisture loss, and effect is better than 0.1%HA and blank.
Embodiment 7
The wrinkle that the present embodiment investigates hyaluronic acid elastomer (sample of embodiment 6) fills efficacy assessments, and method is as follows:
Experimenter smears at left and right canthus sample and contrast (essence containing the polyhydric alcohol such as glycerol, thickening agent and gel) respectively, and applying amount is 3.0 ± 0.1 mg/cm2, is massaged into absorption of sample gently.3D skin fast imaging system on probation (PRIMOS, Germany) is evaluated and is smeared front and smear the change of canthus wrinkle mean depth of rear 30min, 1h, 3h and 6h.
Wrinkle mean depth Sa increment rate (%)=
× 100
Table 8 canthus wrinkle mean depth increment rate
Sa relative value (%) |
30min |
1h |
3h |
6h |
5% sample |
-2.67 |
-2.24 |
-1.96 |
-1.85 |
Contrast |
1.28 |
2.40 |
2.36 |
2.72 |
Hyaluronic acid elastomer, uses rear canthus wrinkle mean depth increment rate comparison to throw light on and shows reduction, so hyaluronic acid elastomer of the present invention has good wrinkle filling effect.
Embodiment 8
The present embodiment investigates the elastomeric cytotoxicity of hyaluronic acid, and according to EN ISO 10993-5: 2009 " biological assessment of medical apparatus and instruments--the 5th part: vitro cytotoxicity is tested " standard, detect cell proliferation rate, concrete grammar is as follows:
(1) prepare hyaluronic acid elastomer sample according to the method for embodiment 4, sample is added RPMI1640 culture fluid (0.2 g/ml), at 37 DEG C, lixiviate 72 h under 5% carbon dioxide conditions after mixing, 0.22 μm of membrane filtration is degerming, obtains lixiviating solution.
(2) by 1 × 10
5the L929 cell suspending liquid of individual/mL is inoculated in 96 porocyte culture plates, is placed in 37 DEG C of CO2 gas incubator and cultivates 24 hours, after cell attachment growth, removes supernatant, is divided into matched group and experimental group two groups.
(3) matched group adds RPMI1640 culture fluid; Experimental group adds the RPMI1640 culture fluid containing 50% above-mentioned lixiviating solution; Matched group and experimental group are placed in respectively 37 DEG C of CO2 gas incubator to continue to cultivate, took out after 2 days, the every hole of culture plate adds MTT solution (5mg/ml) 20 μ L, continues cultivation 4 h in 37 DEG C, stops cultivating.
(4) careful suction abandons culture supernatant in hole, and every hole adds 200 μ L DMSO, vibrates after mixing in 10 minutes, measures its absorbance with enzyme-linked immunosorbent assay instrument respectively under 630 nm.
(5) according to the relative appreciation rate of formulae discovery cell (RCR) below:
RCR(%)=(experimental group mean absorbance values/matched group mean absorbance values) × 100%.
Cell relative to appreciation rate RCR and cytotoxicity classification relationship as follows:
RCR is not less than 100%, and cytotoxicity is classified as 0 grade;
RCR is 75 ~ 99%, and cytotoxicity is classified as 1 grade;
RCR is 50 ~ 74%, and cytotoxicity is classified as 2 grades;
RCR is 25 ~ 49%, and cytotoxicity is classified as 3 grades;
RCR is 1 ~ 24%, and cytotoxicity is classified as 4 grades;
RCR is 0%, and cytotoxicity is classified as 5 grades;
The cell recorded with said method judges the elastomeric biocompatibility of hyaluronate sodium relative to appreciation rate.RCR is higher, shows that the elastomeric biocompatibility of cross-linked-hyaluronic acid to be measured is better.
Hyaluronic acid elastomer cytotoxicity testing result: the relative rate of increase of cell is the cell proliferation rate of 93.49%(negative control is 100%), cytotoxicity is I level.The elastomeric biocompatibility of gained hyaluronic acid of the present invention is very good.
To sum up, gained gel of the present invention has excellent viscoelasticity, moisture-retaining capacity, physics fill wrinkle ability, can slow release functional component, improve and use sensation, and there is good biocompatibility.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not by the restriction of embodiment; other is any do not deviate from spirit of the present invention and principle under make change, modification, combination, substitute, simplify and all should be equivalent substitute mode, be included within protection scope of the present invention.