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Determination of nitrogen content in Mongolian heibingpian

XING Jiehong;YUE jingzhuo;LIU Qingling;Inner Mongolia Pharmaceutical Co.,Ltd.;  
Objective: To establish a method for the content determination of heibingpian and improve the quality control of heibingpian. Methods: The content of 10 batches of borneol was determined by nitrogen method, and the content index was established. Results: The average nitrogen content of 10 batches of borneol was 2.39%, the RSD of repeatability test was 0.79%, the average recovery rate of high, medium and low concentration was 97.08%, the RSD was 1.02%. Conclusion: The method of content determination is accurate and reliable, and can be used for quality control of Borneol nigra.
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