Extracts of Coreopsis tinctoria Nutt. Flower Exhibit Antidiabetic Effects via the Inhibition of α-Glucosidase Activity

Table 1

Chemical composition in EEC and WEC identified by LC-MS.

Peak	(min)	Constituents	[M-H]^−	Daughter ions	EEC	WEC
1	4.60	3′,5,5′,7-Tetrahydroxyflavanone-O-hexoside	449.1057	287 [M-H-hexose]^−	√
2	4.97	Coreopsin	433.1132	271 [M-H-glucose]^−		√
3	5.17	Quercetagitin-7-O-glucoside	479.0811	317 [M-H-glucose]^−	√	√
4	5.69	Okanin	287.0546	151 (^1,3A^−), 135	√	√
5	5.93	3,4′,5,6,7-Pentahydroxyflavanone	303.0501	285 [M-H-H2O]^−	√
6	6.33	Luteolin-7-O-glucoside	447.0919	285 [M-H-glucose]^−	√	√
7	7.16	Chlorogenic Acid	353.0861	191 [M-H-caffeic acid]^−	√
8	7.50	Luteolin	285.0398	133	√
9	7.76	Coreopsin	433.1118	271 [M-H-glucose]^−, 135	√
10	7.88	Dicaffeoylquinic Acid	515.1171	353 [M-H-caffeic acid]^−	√	√
11	9.23	3′,5,5′,7-Tetrahydroxyflavanone	287.0544	151 (^1,3A^−)	√	√

: retention time (minute), [M-H]⁻: the primary Mass Spectrometry.