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The antioxidant activity of caffeic acid compounds was significantly higher than that of flavonoids, implying that the antioxidant activity was related to the presence of hydroxyl groups, but not be facilitated by the number of hydroxyl groups. The antioxidant activity was associated with the existence of phenolic hydroxyl group [27]: compounds had the antioxidant activity by containing the phenolic hydroxyl group, while they had no antioxidant activity due to the lack of a phenolic hydroxyl structure. The antioxidant activity of caffeoylquinic acid compounds could be ranked as follows: 3,4-Dicaffeoylquinic acid > 1,5Dicaffeoylquinicacid > 3,5-Dicaffeoylquinic acid, indicating that the substitution position of caffeoyl on quinic acid had a greater influence on DPPH activity. [Extracted from the article]

To evaluate the quality of Polyporus umbellatus, we established a simple, repeatable and reliable method based on high performance liquid chromatography (HPLC) for specific chromatogram and fingerprint analysis, which was applied to analyze samples of medicinal materials and decoction pieces collected from different regions. Finally, ten characteristic peaks were designated in the specific chromatograms and applied to the authenticate identification of P. umbellatus samples. Nine common peaks were designated in the fingerprints, and then the similarities between 32 batches of samples were calculated. Among them, eight compounds were identified by HPLC-APCI-IT-TOF-MSn, four of which were identified in specific chromatograms and four in fingerprints. In the present study, we, for the first time, combined HPLC specific chromatograms and fingerprints for the species identification and quality evaluation of P. umbellatus. Collectively, our findings provided a new method for establishing a comprehensive quality standard of P. umbellatus. [ABSTRACT FROM AUTHOR]