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【单选题】
有关微囊的评价指标,下列表述不正确的是A.
一般采用溶剂提取法提取药物进行含量测定,选择的原则是应使药物最大限度的溶解而囊材溶解最少,且溶剂本身不干扰含量测定
B.
对于粉末状微囊,可以仅测定载药量,而对于液态介质中的微囊可用离心或滤过等方法分离微囊后,再计算载药量和包封率
C.
微囊载药量=投药量/(药物+囊材)×100%
D.
包封率=[微囊内药量/(微囊内药量+介质中药量)] ×100%
E.
微囊大小应均匀、可分散性好,常用自动测定仪、库尔特计数仪等测定,也可用显微镜测定
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