A kind of preparation method of self-adhesive skin repair hydrogel
A skin repair and hydrogel technology, applied in capsule delivery, pharmaceutical formula, nanocapsules, etc., can solve problems such as insufficient skin donor sites, and achieve high efficacy, avoid drug resistance, and good adhesion
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Embodiment 1
[0021] The quaternized chitosan adopts prior art, and its preparation steps are as follows:
[0022] 1. Prepare chitosan solution: dissolve chitosan in acetic acid solution containing 2%-5% mass fraction (chitosan concentration: 1 wt.%-10 wt.%)
[0023] 2. Prepare glycidyltrimethylammonium chloride solution: dissolve 30 g glycidyltrimethylammonium chloride (ETA) in 30ml water, then add the ETA solution dropwise to the CS solution, and stir magnetically.
[0024] 3. React the mixed solution at 80°C for 10 h, then pour it into cold acetone, place it in the refrigerator for 24 h, then pour out the acetone, leaving a gel-like product.
[0025] 4. Dissolve the product in 100 ml methanol, and then pour it into a mixed solution of 250 ml ethanol: acetone (volume ratio 1:4) to precipitate the product.
[0026] 5. The product was dialyzed with deionized water at room temperature, and freeze-dried to obtain quaternized chitosan powder.
[0027] B. Preparation of dopamine-functionalize...
Embodiment 2
[0034] A. quaternization chitosan is with step A in example 1.
[0035] B. Preparation of dopamine-functionalized gelatin
[0036] Gelatin and dopamine were added to 200 ml of Tris buffer (10 mM, pH=8.5), wherein the mass ratio of gelatin to dopamine was 3:1, and the mixed solution was sonicated in an ice bath to disperse. The mixture was vigorously stirred overnight with heating. After the dopamine and gelatin fully react, the solution is filtered, washed, dialyzed and freeze-dried to obtain dopamine-functionalized gelatin.
[0037] C. Preparation of Bovine Serum Albumin (BSA) Nanoparticles Loaded with Epidermal Growth Factor (EGF)
[0038] Dissolve epidermal growth factor (EGF) which can promote skin regeneration in 20 mg / ml BSA solution. Slowly and uniformly add ethanol dropwise to the mixed solution of BSA and growth factors (volume ratio of ethanol-BSA solution is 1:4), and continue to stir for 24 hours to obtain nanoparticles, and finally obtain encapsulated epidermal...
Embodiment 3
[0042] A. quaternization chitosan is with step A in example 1.
[0043] B. Preparation of dopamine-functionalized gelatin
[0044] Gelatin and dopamine were added to 200 ml of Tris buffer (10 mM, pH=8.5), wherein the mass ratio of gelatin to dopamine was 4:1, and the mixed solution was sonicated in an ice bath to disperse. The mixture was vigorously stirred overnight with heating. After the dopamine and gelatin fully react, the solution is filtered, washed, dialyzed and freeze-dried to obtain dopamine-functionalized gelatin.
[0045] C. Preparation of Bovine Serum Albumin (BSA) Nanoparticles Loaded with Vascular Endothelial Growth Factor (VEGF)
[0046]Dissolve vascular endothelial growth factor (VEGF) which can promote skin regeneration in 40 mg / ml BSA solution. Ethanol was slowly and uniformly added dropwise to the mixed solution of BSA and growth factors (the volume ratio of the ethanol-BSA solution was 1:4), and the stirring was continued for 24 hours to obtain nanopart...
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