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《Research and Practice on Chinese Medicines》 2013-01
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Determination of Usnic Acid in Lichen Usneae by HPCE

ZHOU Xue-hong,Li Zhi-hao(Department of Pharmacy,Affiliated Dongfeng Hospital,Hubei Medical University,Shiyan 442008,China)  
Objective To establish an HPCE method for determining the usnic acid in Lichen Usneae.Method Sodium benzoate was used as internal standard.An uncoated fused silica capillary(57 cm×75 μm,effective length of 50 cm) was used.The electrolyte buffer composed of 40 mmol·L-1 borax-MeOH(85:15),applied voltage 28 kV,detection wavelength was 254 nm.Results Usnic acid was successfully separated within 20 min,the linear response range was 0.124-2.48 mg·mL-1.The average recovery was 98.6%.Conclusions The analytical results demonstrated the method was simple,rapid and well reproducible,and could be used as a reliable tool for the quantity control of Lichen Usneae and its descriptions.
【CateGory Index】: R284.1
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