title: Rapid Screening and Structural Characterization of Antioxidants from the Extract of Selaginella doederleinii Hieron with DPPH-UPLC-Q-TOF/MS Method.
abstract: 2,2-Diphenyl-1-picrylhydrazyl-ultra-high performance liquid chromatography-Q-time-of-flight mass spectrometry (DPPH-UPLC-Q-TOF/MS), as a rapid and efficient means, now was used for the first time to screen antioxidants from Selaginella doederleinii. The nine biflavone compounds were screened as potential antioxidants. The biflavones were structurally identified and divided into the three types, that is, amentoflavone-type, robustaflavone-type, and hinokiflavone-type biflavonoids. Among the compounds bilobetin (3) and putraflavone (8) were found from Selaginella doederleinii for the first time and others including amentoflavone (1), robustaflavone (2), 4'-methoxy robustaflavone (4), podocarpusflavone A (5), hinokiflavone (6), ginkgetin (7), and heveaflavone (9) were identified previously in the plant. Moreover, nine biflavones possessed a good antioxidant activity via their DPPH free radical scavenging. It demonstrates that DPPH-UPLC-Q-TOF/MS exhibits strong capacity in separation and identification for small molecule. The method is suitable for rapid screening of antioxidants without the need for complicated systems and additional instruments.
authors: Zunyi Medical College, Zunyi, Guizhou 563003, China ; Sichuan University, Chengdu, Sichuan 610000, China.
authors: Gang
authors: G
authors: Wang
authors: Sichuan University, Chengdu, Sichuan 610000, China.
authors: Shun
authors: S
authors: Yao
authors: Zunyi Medical College, Zunyi, Guizhou 563003, China.
authors: Xiu-Xiu
authors: XX
authors: Zhang
authors: Sichuan University, Chengdu, Sichuan 610000, China.
authors: Hang
authors: H
authors: Song