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以对二甲胺基苯甲醛为显色剂，用分光光度法测定罗红霉素片的溶出度，方法简便快速，选择性好，灵敏度高。回收率为１００．０５％，ＲＳＤ＝１．２８％。
With p-dimethylaminobenzaldehyde as chromogenic reagent, the dissolution of roxithromycin tablets was determined by spectrophotometry. The method was simple, rapid, selective and sensitive. The recovery was 100.05% with RSD = 1.28%.