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药品的稳定性参数与三方面有关:微生物学的,化学的,物理学上的.高效液相色谱可测量药品的化学稳定性,但是需要花费大量的资源,如大量的时间、专业的培训和昂贵的设备投入。水活度（AW），一种相对湿度法，是一种快速、简单、低成本的方法可用来预测药品的微生物稳定性（AOAC1980,Enigl1999, Enigland Sorrells 1997,FDA 1979,
Friedel1999,Friedel and CundellI998)。


Pharmaceutical Stability Testing Using Water Activity

Introduction
Many pharmaceutical product stability parameters exist: microbiological,chemical, and physical. The HPLC, a chromatographic method, measures chemical stability but requires many resources such as extensive time, rigorous technician training and high equipment monetary value. Water activity(a.), a humidity method, Is fast, simple, and low cost, however, aw is known mostly for predicting microbiological stability(AOAC1980,Enigl1999,Enigland Sorrells 1997,FDA 1979, Friedel1999,Friedel and CundellI998). Aw is not currently as Well known for chemical or physical stability testing.



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