Antidiabetic Effect of an Active Components Group from Ilex kudingcha and Its Chemical Composition

Table 4

HR-ESI-TOF-MSn data of flavonoids and triterpenoid saponins identified in ACG.

peak no.*	Rt min	CID spectra of [M-H]^− (relative intensity, %)			Identification	Lit. report
		[M-H]^−	Base ion	Other ions
Flavonoids
4	20.3	609 (1.8)	301 (100)	463 (9.0), 271 (22.2)	Quercetin 3-rutinoside	[10]
5	22.4	463 (1.8)	301 (100)	285 (6.2), 271 (77.7)	Quercetin 3-glucoside
6 **	23.0	595 (4.6)	301 (100)	463 (24.7), 285 (8.4)	Quercetin 3-vicianoside
7 **	23.7	593 (4.3)	285 (100)	447 (23.8), 255 (37.6)	Kaempferol 3-rutinoside	[10]
Triterpenoid saponins
11	31.5	745 (1.1)	467 (100)	599 (48.3), 369 (14.6)	3-O-𝛼-L-Rhamnopyranosyl-(1-2)-𝛼-L-arabinopy-ranosyl-𝛼-kudinlactone	[15]
12	32.0	1073 (0.1)	749 (100)	911 (19.8), 603 (7.9), 471 (3.6)	Macranthoside B	[16]
13	32.4	1073 (0.2)	749 (100)	911 (12.8), 603 (8.0), 471 (7.8)	Isomer of 12	***
15	35.5	971 (0.1)	809 (100)	763 (49.9), 647 (6.5), 471 (8.9)	3-O-𝛽-D-Glucopyranosyl-(1-4)-𝛽-D-Glucuronopyranosyl siaresinolic acid-28-O-𝛽-D-glucopyranosyl ester	[17]
16	37.0	955 (0.3)	793 (100)	631 (42.6), 455 (8.5)	Isomer of 17	***
17	37.3	955 (0.8)	793 (100)	631 (38.6), 455 (10.2)	3-O-𝛽-D-Glucopyranosyl-(1-4)-𝛽-D-glucuronopyranosyl oleanolic acid-28-O-𝛽-D-glucopyranosyl ester	[17]
Unknown compound
14	34.1	582 (0.6)	374 (100)		Unknown

*The numbers of the peaks in this table coincide with the numbers of the peaks in Figure 5.
**Compounds 6 and 7 were not clearly separated in LC-MS analysis.
***Since NMR data and the corresponding standards of these compounds were not available, identification of these compounds could not be completed by the LC-MS/MS in this study.