A microcapsule containing an amorphous water-soluble 2-piperazinone-1-acetic acid compound or salt thereof and a polymer and a method of preparing said microcapsule, which comprises dispersing in an aqueous phase a dispersion of the amorphous water-soluble 2-piperazinone-1-acetic acid compound or salt thereof in a solution of a polymer in an organic solvent to give an s/o/w type emulsion and subjecting the emulsion to in-water drying.
The sustained-release microcapsule which is advantageous in entrapping 2-piperazinone-1-acetic acid compound or the salt thereof as a drug in a high concentration, and in the reduced initial release of the drug, thereby reducing undesirable side effects of the drug.
一种含有无定形
水溶性
2-哌嗪酮-1-乙酸化合物或其盐和聚合物的微胶囊,以及一种制备所述微胶囊的方法,其中包括将无定形
水溶性
2-哌嗪酮-1-乙酸化合物或其盐在有机溶剂中的聚合物溶液中的分散液分散在
水相中,得到s/o/w型乳液,并将乳液进行
水中干燥。
这种缓释微胶囊的优点是能以高浓度夹带作为药物的
2-哌嗪酮-1-乙酸化合物或其盐,并能减少药物的初始释放,从而减少药物的不良副作用。