- CARDENOLIDE DIGLYCOSIDES FROM OXYSTELMA ESCULENTUM
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Two new cardenolide diglycosides, named oxystelmoside and oxystelmine, were isolated from the dried roots of Oxystelma esculentum.On the basis of chemical and spectroscopic evidence their structures were established as uzarigenin 3-O-β-D-xylopyranosyl(1->4)-O-β-D-digitalopyranoside and periplogenin 3-O-6-deoxy-β-D-glucopyranosyl(1->4)-α-D-digitalopyranoside. Key Word Index - Oxystelma esculentum; Asclepiadaceae; roots; oxystelmoside; oxystelmine; steroid; cardenolide glycoside.
- Srivastava, Suman,Khare, Maheshwari P.,Khare, Anakshi
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p. 1019 - 1022
(2007/10/02)
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- Degradation of Cardenolide Glycosides
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The thermal degradation of cardenolide glycosides consisting of different sugar moieties and aglycones was examined.On simple heating, the sugar - aglycone linkage of cardenolide glycosides having 2,6-dideoxy sugar moieties is readily cleaved, to afford their genuine aglycones.On the contrary, cardenolide glycosides possessing 6-deoxy sugar moieties are resistant to the degradative reaction.Besides the fission of the glycosidic linkages, some interesting reactions also took place.The pyrolyzed products were isolated by chromatography, and the structures were elucidated by spectroscopic evidence.
- Kim, Youn Chul,Higuchi, Ryuichi,Komori, Tetsuya,Abe, Fumiko,Yamauchi, Tatsuo
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p. 943 - 947
(2007/10/02)
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- BIOTRANSFORMATION OF DIGITOXIGENIN BY GINSENG HAIRY ROOT CULTURES
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Five new compounds (three esters and two glycosides) and seven previously reported compounds were isolated as biotransformation products of digitoxigenin by ginseng hairy root cultures.The new esters and glycosides were elucidated as digitoxigenin stearate, digitoxigenin palmitate, digitoxigenin myristate, 3-epidigitoxigenin β-D-gentiobioside and digitoxigenin β-D-sophoroside using 1H and 13C NMR and FAB mass spectral data.Biotransformations involving esterification (of stearic acid, palmitic acid, myristic acid and lauric acid) and glycosylation (of gentiobiose and sophorose) of digitoxigenin have been demonstrated for the first time in the plant cell and tissue cultures.The hairy roots showed high glycosylation ability to the digitoxigenin molecule.
- Kawaguchi, Kiichiro,Hirotani, Masao,Yoshikawa, Takafumi,Furuya, Tsutomu
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p. 837 - 843
(2007/10/02)
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