期刊
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
卷 17, 期 5, 页码 321-324出版社
ELSEVIER
DOI: 10.1016/S1773-2247(07)50049-3
关键词
elastic liposomes; positively-charged liposomes; acyclovir; skin deposition
Elastic positively-charged liposomes of soya lecithin were prepared using sucrose monopalmitate as deforming agent, and L alanine benzyl ester or stearylamine as cationic charge-inducing agent. The positive charge of the liposomes was confirmed by zeta potential measurements and their elasticity by filtration through microporous filter. Positively-charged liposomes had a higher acyclovir entrapment efficiency than negatively-charged liposomes. Elastic positively-charged liposomes containing acyclovir, applied non-occlusively to pig-ear skin, determined a skin flux similar to that of non-elastic positively-charged liposomes, prepared using soya lecithin, cholesterol and stearylamine, but higher than that of non-elastic negatively-charged liposomes or control suspension. Skin deposition of acyclovir from elastic positively-charged liposomes was higher (up to 600 nmol/cm(2)) than that from non-elastic positively- or negatively-charged liposomes (respectively 344 nmol/cm(2), 237 nmol/em(2)) and than that from elastic negatively-charged liposomes (435 nmol/cm(2)). The enhanced ACV accumulation within the skin obtained with elastic positively-charged liposomes might help to optimize drug targeting, creating new opportunities for well-controlled, modern, topical application of ACV in the treatment of Herpes simplex.
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