Objective  To establish an ultra-high performance liquid chromatography (UPLC) fingerprint and multi-index content determination method of Siraitiae fructus standard decoction.

Methods  15 batches of Siraitiae fructus from different producing areas were collected, Siraitiae fructus standard decoction was prepared according to Technical Requirements for Quality Control and Standardization of Traditional Chinese Medicine Formula Granules, and the extract rate was calculated. UPLC was used to establish the fingerprint of 15 batches of Siraitiae fructus standard decoction and determine the contents of 11-O-mogroside V, kaempferitrin and mogroside V, which were the main effective components. The chemometrics analysis was used to evaluate the quality of Siraitiae fructus standard decoction and find possible quality markers.

Results  The extraction rate of 15 batches Siraitiae fructus standard decoction ranged from 24.79% to 34.95%. There were 16 common peaks in the fingerprint, and 4 components were identified. The Siraitiae fructus standard decoction was divided into 2 categories by chemometrics analysis, among which samples from Liuzhou, Guangxi were in one category and samples from Guilin, Guangxi were in another category. Seven differential markers were screened out under the condition of variable importance projection value, and the order was as follows: peak 8>peak 7>peak 5>peak 12 (kaempferitrin) >peak 1>peak 13>peak 4. The contents of kaempferitrin, 11-O-mogroside V and mogroside V in samples from Guilin, Guangxi were slightly higher than those in samples from Liuzhou, Guangxi.

Conclusion  The UPLC fingerprint and content determination method established in this study are feasible, which can provide a basis for the quality evaluation of Siraitiae fructus. The results of principal component analysis show that kaempferol is likely to become a quality marker of Siraitiae fructus.

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