O-acylated flavonoid glycoside of the needles ofPicea obovata

Acylated Flavonol Glycosides from Leaves ofStenochlaena palustris

“…The identification of three known O -acylated flavonol glycosides, kaempferol 3- O -(3‘ ‘- O - E - p -coumaroyl)-(6‘ ‘- O - E feruloyl)-β- d -glucopyranoside ( 6 ), kaempferol 3- O -(3‘ ‘,6‘ ‘-di- O - E - p -coumaroyl)-β- d -glucopyranoside ( 7 ), and kaempferol 3- O -(3‘ ‘- O - E - p -coumaroyl)-β- d -glucopyranoside ( 8 ), were carried out by spectral analysis ( 1 H, 13 C NMR, DQF−COSY, HMQC, HMBC, and FABMS) and the comparison of 1 H NMR spectra with those published. ,, They have all been previously isolated only from the needles of Picea obovata Ledeb. (Pinaceae). ,, Compound 9 was identified as kaempferol 3- O -(6‘ ‘- O - E - p -coumaroyl)-β- d -glucopyranoside; compound 10 , as kaempferol 3- O -β- d -glucopyranoside, by MS, 1 H NMR, and 13 C NMR data analysis and comparison with the reported data of authentic samples. , …”

Seasonal accumulation of ultraviolet‐B screening pigments in needles of Norway spruce (Picea abies (L.) Karst.)

“…The authors calculated that approximately 40% of the kaempferol 3‐ O ‐glucoside was possibly translocated to an ester‐bound insoluble cell wall‐pool in their experiments. They postulated a putative unknown sink for kaempferol 3‐ O ‐glucoside and speculated that it might be transformed to diacylated flavonol glucosides which at that time were only known from other Picea species (Ivanova et al 1978; Zapesochnaya et al 1979). In our experiments, at least 75% of kaempferol 3‐ O ‐glucoside would be possibly conjugated with cinnamic acids to give diacylated flavonoids (sum of flavonoids 1 and 2) and approximately 11% would be translocated from the soluble pool into the cell wall, within 30 d from mid‐June to mid‐July.…”

“…In previous studies a group of closely related diacylated flavonol glucosides has been isolated and characterized from Scots pine (Ivanova et al 1978;Jungblut et al 1995;Jungblut 1996), and Picea obovata Ledeb. (Zapesochnaya et al 1979). On the basis of these data, four flavonoids were identified in UV-B, (in 1995, n = 12;in 1996, n = 7 in the cabinets, n = 5 in the field; median, 25 and 75 percentiles).…”

The Flavonoids

“…This is true of the mono-p-coumaroyl esters of kaempferol 3-glucoside. Two are of certain structure: the ff' -ester, tiliroside from Tilea argentea petals and recently described [rom Anapha/is contorta (Compositae) and [rom Pinus contorta needles ; and the 3" -ester, found in needles of Picea obovata by Zapesochnaya et al (1978). An ester (of undefined …”

“…The rate of discovery of new glycosides is apparent from the increase in the number of known kaempferol derivatives from 50 to 104, of quercetin derivatives from 62 to 112, and of myricetin derivatives from 12 to 25. Zapesochnaya (1969) Chauhan and Chauhan et al (1979a) Stepien et al (1978) Wollenweber et al (1978b) Ishikura and Sato (1977) Okuyama et al (1978) 282 The Flavonoids Ishikura and Hayashida (1979) Williams et al (1981) Hiraoka (1978) Ishikura et al (1976) Vancraenenbroeck et al (1969) Buttery and Buzzell (1975) EI Sherbeiny et af. ( 1977) Ishikura and Sato (1977) Flavone Yamasaki et al (1977) 3{.…”