Encapsulation of ethanol by spray drying technique: effects of sodium lauryl sulfate

Encapsulation of ethanol by spray drying technique: effects of sodium lauryl sulfate


Kim CK Seoul Natl Univ, Coll Pharm San 56-1,Shinlim Dong,Kwanak Gu Seoul 151742 South Korea Seoul Natl Univ, Coll Pharm Seoul 151742 South Korea
Lee SW, Kim MH, Kim CK
Microcapsules composed of ethanol, water and dextrin as a water-soluble polymer can be used to encapsulate poorly water-soluble drugs by splay drying technique. For the encapsulation of a high dose of poorly water-soluble drugs, large amounts of ethanol and consequently large quantities of dextrin are needed for the dissolution of drug and the encapsulation of ethanol, respectively. In order to increase the ethanol content with the decreased amount of dextrin. sodium lauryl sulfate (SLS) was employed in the preparation of microcapsules without drug by a spray drying method. Phase diagrams were prepared to determine the region of microcapsule formation with a three-component system of ethanol, dextrin and water. The homogeneous phase indicated in the phase diagram was used to prepare the alcoholic microcapsules since this phase was not separated rapidly and not too viscous to be spray-dried. Interestingly, SLS at concentrations below 2% remarkably increased both the ethanol content and the encapsulation efficiency of ethanol, The maximum ethanol content and encapsulation efficiency were observed with 0.5-1% of SLS (35.4 and 67.6%, respectively). Furthermore, the increase by SLS was more pronounced at the low dextrin/water ratios than at the high dextrin/water ratios. In particular, the ethanol content and the encapsulation efficiency with the dextrin/ethanol/water ratio of 0.4/1/1, which had relatively small amounts of dextrin, were about ten times higher in the presence of SLS than those without SLS, In conclusion, this study shows that small amounts of SLS can increase the ethanol content and the encapsulation efficiency of ethanol, and allow the reduction in the amount of dextrin required to encapsulate ethanol in the preparation of microcapsules. These findings suggest that the use of SLS may permit the effective encapsulation of high dose of water-insoluble drug into microcapsules. (C) 1999 Elsevier Science B.V. All rights reserved. [References: 9]

기본적인 원리 설명
1) 물+덱스트린+에탄올로 구성된 마이크로 캡슐은 물에 잘 녹지 않는 약품의 encapsulation에 이용되는데, 이 microcapsule은 spray drying 방식에 의해 만들 수 있다.
2) 그런데, SLS(sodium lauryl surfate)를 소량추가하면 dextrine을 소량 넣고서도 ethanol을 많이 포함시키면서 encapsulation의 효과를 높일 수 있다.
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