Evaluation of uncertainty measurement in the assay of Danshu Capsule / 中成药

AIM: To establish a method for evaluating uncertainty of Danshu Capsule(peppermint oil). METHODS: The uncertainty originated from menthol in Danshu Capsule was analyzed by GC.The influencing factors on the uncertainty were evaluated, including solution strength of reference substance,sample weight,solution volume of sample,peak area of chemical reference substance,peak area of sample,average weight of capsule,etc. RESULTS: The expanded uncertainty U_95 was 1 mg(P=95%,k=2). CONCLUSION: It can be used for evaluation of uncertainty measurement by GC.