Flavones isoorientin

Trigonella foenum-graecum L. Wu Ru Ba (Fenugreek) (seed) Trigonelline, saponins, flavone derivatives including vitex, saponaretin, isoorientin, vitexin-7-glucoside.33 Reduce plasma cholesterol levels, support hepatic and renal functions. 

Isoorientin (= Luteolin 6-C-glucoside) (flavone C-glycoside) Polygonum orientate (Polygonaceae) ACE (48% inhibition at 736 pM) [78]... 

Fig. 14 (-)-Epicatechin (flavan-3-ol, 62), (-)-epigallocatechin (flavan-3-ol, 63), (+)-catechin (flavan-3-ol, 43) and (+)-gallocatechin (flavan-3-ol, 64) in leaves of tea (Camellia sinensis L.), and analogs of luteolin (flavone, 65) and isoorientin C-glycoside (flavone C-glycoside, 66) in angiosperms...

The antioxidative role of anthocyanins and flavones in providing stable blue flower colors in the angiosperms has been studied. The leaf anthocyanins and flavones showed a protective effect against UV-B radiation. These protective UV-B flavonoids in angiosperms were mainly kaempferol (9), quercetin (10), cyanidin (51), luteolin (65), and isoorientin C-glycoside (flavone C-glycoside, 66) (Fig. 14) [35]. 

Fig. I6A A methanoiic extract of Lespedezae herba (4) contains more highly glycosidated flavonoids (R, range 0.05-0.35) such as kaempferol- and/or isorhamnetin-rhamno-glucoside and rutin (Tl). The EtAc extract (5,6) contains the enriched yellow zones of flavon-C-glyco.sides such as isoorientin (R, -- 0.S/T3), orientin (R, — 0.65/T3) overlapped by isovitexin, a.s well as flavonol-O-glycosides such as lespedin, hyperoside, isoquerdtrin and querdtrin (Rf 0.6-0.8).

Pereira, C.A.M., Yariwake, J.H., and McCuUagh, M. 2005. Distinction of the glycosyl-flavone isomer pairs orientin/isoorientin and vitexin/isovitexin using HPLC-MS exact mass measurement and in-source CID. Phytochem. Anal. 16 295-301. 

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