화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.9, No.2, 153-158, March, 2003
Poly(acrylate-co-vinylacetate) Adhesive Patch for Sustained Dermal Delivery of Vitamin A
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An adhesive patch-type delivery system is suggested for sustained dermal application of vitamin A. Poly(acrylate-co-vinylacetate) was used as a pressure-sensitive adhesive. In vivo skin permeation of vitamin A from the patch was studied and compared with that of a conventional oil-in-water cream. The patch was found to enable to prolong the skin permeation of vitamin A, whereas the cream showed an initial burst skin absorption. The relative vitamin A bioavailability of the patch was about 76.9%, compared with that of the cream. Patches were less irritable to skin than the cream when the same amount of vitamin A was loaded. The lower skin irritancy might be due to the sustained release of vitamin A from the patch matrix. Silicon replica analysis was carried out as a clinical study to quantify the effects of the vitamin A patch on cutaneous relief. Repeated application of vitamin A-loaded patches onto crow's feet wrinkles for 12 weeks resulted in a reduction of the total surface area and the length of the wrinkles by up to 23% and 17%, respectively, without irritation.
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