Controlled drug release system of retinoic acid
First Claim
1. A controlled drug release system for retinoic acid characterized in that retinoic acid is incorporated into a microsphere prepared by mixing a biodegradable polymer, which is selected from the group consisting of poly-L-lactic acid, poly-D,L-lactic acid and poly(lactic-co-glycolic acid), and an amphiphilic AB type di-block copolymer, which is poly-L-lactic acid-polyethyleneglycol or poly(lactic acid-co-glycolic acid)-polyethyleneglycol, together, wherein the retinoic acid is selected from the group consisting of all-trans-retinoic acid, 13-cis-retinoic acid, 9-cis-retinoic acid, other retinoids and the mixture thereof, and the mixing ratio of the biodegradable polymer and the amphiphilic block copolymer is 1-20% by weight.
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Abstract
The present invention relates to a controlled drug release system in which a certain ratio or retinoic acid is incorporated into a microsphere comprising biodegradable polymer and amphoteric block copolymer having both hydrophilic and hydrophobic groups.
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5 Claims
- 1. A controlled drug release system for retinoic acid characterized in that retinoic acid is incorporated into a microsphere prepared by mixing a biodegradable polymer, which is selected from the group consisting of poly-L-lactic acid, poly-D,L-lactic acid and poly(lactic-co-glycolic acid), and an amphiphilic AB type di-block copolymer, which is poly-L-lactic acid-polyethyleneglycol or poly(lactic acid-co-glycolic acid)-polyethyleneglycol, together, wherein the retinoic acid is selected from the group consisting of all-trans-retinoic acid, 13-cis-retinoic acid, 9-cis-retinoic acid, other retinoids and the mixture thereof, and the mixing ratio of the biodegradable polymer and the amphiphilic block copolymer is 1-20% by weight.
Specification