Medicament sustained-release carrier for eyes with cooperation treatment function
A technology of slow-release carrier and therapeutic effect, which is applied in the field of slow-release carrier of ophthalmic drugs, which can solve the problems of many impurities and wide molecular weight distribution, and achieve good therapeutic effect, inhibition of new blood vessels, and good suppression and prevention effect
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Embodiment 1
[0020] Extraction of Bletilla striata gum: extract and purify the bletilla striata gum required by the present invention with the following process.
[0021] The preparation of the refined bletilla striata gum required by the present invention comprises following two major steps:
[0022] 1. Crude polysaccharide extraction
[0023] Grind, sieve, and dry the dried bletilla striata tuber products, add 20 times the volume of distilled water, and extract under reflux at 60°C for 4 hours. Repeat the extraction once. Combine the two extracts. Centrifuge (5000×g, 10min), take the supernatant, concentrate under reduced pressure at 70°C, add three volumes of 95% ethanol to precipitate. The precipitate was collected by centrifugation and freeze-dried to obtain crude bletilla striata gum, which is common commercialized bletilla striata gum.
[0024] 2. Separation and purification
[0025] (1) Dissolve common commercial bletilla striata gum in the smallest volume of water, deproteini...
Embodiment 2
[0028] Select the bletilla striata gum prepared in Example 1 to prepare a 12% bletilla striata gum aqueous solution, take 20.0 ml of the bletilla striata gum aqueous solution in a sterile glass bottle, add 20.0 mg of ethylene glycol bisglycidyl ether, stir evenly, and place in a water bath at 55°C for 3 After ~5 hours, fully wash with water for injection to remove unreacted ethylene glycol bisglycidyl ether. Take it out, pour the cross-linked glue solution into a polytetrafluoroethylene mold, and place it in an oven at 40°C to dry to form a film. After the diaphragm is fully dried, take it out and put it in normal saline for injection to fully soak and wash it, take out the diaphragm, and after it is completely dry, a sheet with a thickness of 1.5-2 mm can be obtained, which can be cut into different shapes and sizes according to needs .
Embodiment 3
[0030] In Example 1, ethylene glycol diglycidyl ether is replaced with propylene glycol diglycidyl ether, and the rest of the conditions are unchanged, and the same crosslinking effect can also be obtained.
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