International Journal of Analytical Chemistry

Research Article

Rapid Screening and Structural Characterization of Antioxidants from the Extract of Selaginella doederleinii Hieron with DPPH-UPLC-Q-TOF/MS Method

Table 3

Identification of 9 biflavonoids from Selaginella doederleinii by UPLC/Q-TOF MS/MS.


Peak number	tR (min)	Measured (M+H)⁺	Calculated	ESI-MS/MS	Formula	Identification

1	5.25	539.0956	538.0899	539 [M+H]⁺ 421 [M+H-C₈H₆O]⁺ 403 [M+H-C₈H₆O-H₂O]⁺ 377 [M+H-C₉H₆O₃]⁺ 153 [C₇H₄O₄]⁺ 121 [C₇H₆O₂]⁺	C₃₀H₁₈O₁₀	Amentoflavone

2	6.19	539.0977	538.0899	539 [M+H]⁺ 413 [M+H-C₆H₄O₃]⁺ 387 [M+H-C₇H₄O₄]⁺ 270 [M+H-C₁₅H₉O₅]⁺	C₃₀H₁₈O₁₀	Robustaflavone

3	7.28	553.1110	552.1056	553 [M+H]⁺ 435 [M+H-C₈H₆O]⁺ 403 [M+H-C₈H₆O-CH₃OH]⁺ 391 [M+H-C₉H₆O₃]⁺ 297 [M+H-C₈H₆O-C₂H₂O-C₃O₂-CO]⁺ 153 [C₇H₄O₄]⁺ 121 [C₇H₆O₂]⁺	C₃₁H₂₀O₁₀	Bilobetin

4	8.32	553.1127	552.1056	553 [M+H]⁺ 427 [M+H-C₆H₄O₃]⁺ 401 [M+H-C₇H₄O₄]⁺ 270 [M+H-C₁₅H₉O₅]⁺	C₃₁H₂₀O₁₀	4′-Methoxy robustaflavone

5	8.81	553.1086	552.1056	553 [M+H]⁺ 421 [M+H-C₉H₈O]⁺ 403 [M+H-C₉H₈O-H₂O]⁺ 377 [M+H-C₁₀H₈O₃]⁺ 153 [C₇H₄O₄]⁺ 135 [C₈H₈O₂]⁺	C₃₁H₂₀O₁₀	Podocarpusflavone A

6	9.27	539.0963	538.0899	539 [M+H]⁺ 286 [M+H-C₁₅H₉O₄]⁺ 270 [M+H-C₁₅H₉O₅]⁺ 257 [M+H-C₁₅H₉O₄-CO]⁺ 242 [M+H-C₁₅H₉O₅-CO]⁺	C₃₀H₁₈O₁₀	Hinokiflavone

7	10.92	567.1273	566.1212	567 [M+H]⁺ 449 [M+H-C₈H₆O]⁺ 417 [M+H-C₈H₆O-CH₃OH]⁺ 405 [M+H-C₉H₆O₃]⁺ 167 [C₈H₆O₄]⁺ 121 [C₇H₆O₂]⁺	C₃₂H₂₂O₁₀	Ginkgetin

8	11.47	567.1283	566.1212	567 [M+H]⁺ 435 [M+H-C₉H₈O]⁺ 417 [M+H-C₉H₈O-H₂O]⁺ 391 [M+H-C₁₀H₈O₃]⁺ 167 [C₈H₆O₄]⁺ 135 [C₈H₈O₂]⁺	C₃₂H₂₂O₁₀	Putraflavone

9	14.92	581.1434	580.1369	581 [M+H]⁺ 449 [M+H-C₉H₈O]⁺ 417 [M+H-C₉H₈O-CH₃OH]⁺ 405 [M+H-C₁₀H₈O₃]⁺ 167 [C₈H₆O₄]⁺ 135 [C₈H₈O₂]⁺	C₃₃H₂₄O₁₀	Heveaflavone