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Dissolution Method Study of Ligustrazine Phosphate Pills

??OBJECTIVE To establish a new dissolution method of Ligustrazine Phosphate Pills, which provides reference for revising the quality standard. METHODS The dissolution media were hydrochloric acid solution(pH 1.2), acetate buffer solution(pH 4.5), phosphate buffer solution(pH 6.8) and water. The dissolution curves of six batches of Ligustrazine Phosphate Pills in the four kinds of dissolution media were compared to establish the dissolution method. Apparatus 2 was used for the new method of dissolution test,using 500 mL water as the dissolution medium,at the rate of 75 r??min^-1. The dissolution solution was taken at 20 min and analyzed by HPLC. The dissolution limit was set at 80%. RESULTS The dissolution curves of the six batches of samples were similar in the four kinds of dissolution media. The pills were dissolved completely within 15 min. CONCLUSION The determination method is highly reproducible, accurate and reliable, which can objectively reflect the dissolution of ligustrazine phosphate pills, and provides a basis for the reasonable unification and revision of the dissolution test of the current quality standard.