RESUMO
OBJECTIVE To improve the quality standard of T ibetan medicine of Qinjiaohua ，and to provide scientific basis for comprehensive quality evaluation. METHODS The qualitative analysis of 16 batches of Qinjiaohua with different producing areas and different origins was carried out by microscopic and TLC identification. According to the method stated in 2020 edition of Chinese Pharmacopoeia ，water content ，total ash content ，acid-insoluble ash content and alcohol-soluble extract content were determined. HPLC method was used to determine the contents of 5 components （loganic acid ，swertiamarin，gentiopicrin， swertionolin，isoorientin） in Qinjiaohua. RESULTS The medicinal powder of Qinjiaohua was light brown-yellow ，and the microscopic features of the powder were clear ，and pollen grains ，ducts，non-glandular hairs ，corolla epidermal cells and calyx epidermal cells were all found. The results of TLC indentification showed that there were fluorescent spots of the same color in the chromatogram of the tested product and the corresponding position of substance control （isoorientin）. The content ranges of water content，total ash content ，acid-insoluble ash content and alcohol-soluble extract were 5.40％-8.87％，3.76％-6.40％，0.27％-0.58％， 26.81％-42.51％，respectively. The results of content determination methodology met the requirements of pharmacopoeia ；the content ranges of loganic acid ，swertiamarin，gentiopicrin，swertionolin and isoorientin in 16 batches of Qinjiaohua were 3.13-9.36，1.26-22.39，13.80-74.60，1.24-12.22，2.58-14.96 mg/g，respectively. CONCLUSIONS On the basis of the original quality standard of Qinjiaohua ，microscopic identification ，TLC identification ，content determination and examination items of water，total ash ，acid-insoluble ash and alcohol-soluble extract are added. It is preliminarily proposed that water content ，total ash content and acid-insoluble ash content should not exceed 9.0％，6.5％ and 0.6％，while the contents of ethanol-soluble extract and gentiopicrin should not be less than 26.0％ and 13.8 mg/g，respectively.