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spirostanol/nyam
L'enllaç es desa al porta-retalls
Pàgina 1 des de 16 resultats
Polyhydroxylated spirostanol saponins from the tubers of Dioscorea polygonoides.
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Three new polyhydroxylated spirostanol saponins (1-3) were isolated from the tubers of Dioscorea polygonoides. The structures of these new compounds were determined on the basis of extensive spectroscopic analysis and the results of acid or enzymatic hydrolysis as
Antineoplastic agents; I. Three spirostanol glycosides from rhizomes of Dioscorea collettii var. hypoglauca.
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By activity-guided fractionation, three known steroidal saponins, prosapogenin A of dioscin, dioscin and gracillin, were isolated from the total saponin fraction of Dioscorea coiletti var. hypoglauca as active compounds causing morphological abnormality of Pyricularia oryzae mycelia. The compounds
Application of high-speed countercurrent chromatography-evaporative light scattering detection for the separation of seven steroidal saponins from Dioscorea villosa.
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BACKGROUND
Steroidal saponins in Dioscorea species are chemically characterised as spirostanol and furostanol saponins, and have been used as standard marker compounds due to their chemotaxonomical significance and their important biological activities.
OBJECTIVE
To design a simple, rapid and
Ultrahigh-performance liquid chromatography-ion trap mass spectrometry characterization of the steroidal saponins of Dioscorea panthaica Prain et Burkill and its application for accelerating the isolation and structural elucidation of steroidal saponins.
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Dioscorea panthaica is a traditional Chinese medicinal herb used in the treatment of various physiological conditions, including cardiovascular disease, gastropathy and hypertension. Steroidal saponins (SS) are the main active ingredients of this herb and have effects on myocardial ischemia and
Determination of steroidal saponins in different organs of yam (Dioscorea pseudojaponica Yamamoto).
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Yams (Dioscorea spp.) are perennial trailing rhizome plants. Steroidal saponins, furostanol and spirostanol glycosides are the marked functional compounds in yams. In this investigation, a C18 solid phase extraction method was developed for yam saponins purification. The contents of saponins in
Effects of domestic processing on steroidal saponins in Taiwanese yam cultivar (Dioscorea pseudojaponica Yamamoto).
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The effects of domestic processing on steroidal saponins and furostanol and spirostanol glycosides in Taiwanese yam cultivar (Dioscorea pseudojaponica Yamamoto) were studied. The baking or frying of yam slices was conducted at 150, 180, and 200 degrees C for 3, 5, and 10 min. Yam slices were steamed
Isolation and identification of steroidal saponins in Taiwanese yam cultivar (Dioscorea pseudojaponica Yamamoto).
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A new furostanol pentaoligoside and spirostanol tetraoligoside were isolated for the first time from yam tubers (Dioscorea pseudojaponica Yamamoto) from Taiwan, together with four known yam saponins, methyl protodioscin, methyl protogracillin, dioscin, and gracillin. Their structures were
Lipidated steroid saponins from Dioscorea villosa (wild yam).
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Two groups of lipidated steroid saponins including seven new compounds (2, 3, 5, and 7-10) were isolated from the widely used botanical, wild yam (Dioscorea villosa), employing a fractionation protocol of metabolomic mining. This methodology recently led to the isolation of 14 diarylheptanoids from
[Composition and biological activity of steroid glycosides from a suspended culture of Dioscorea deltoidea Wall cells].
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Two major steroid spirostanol glycosides (oligospirostanosides): deltoside (melting point, 296 degrees C, [alpha]D10:-90.8 degrees C (c 5.0,Py) and dioscine (melting point, 285-285 degrees C, [alpha]D10:-106.5 degrees C (c 5.0, Py) and a minor glycoside
Preparation of progenin III from total steroidal saponins of Dioscorea nipponica Makino using a crude enzyme from Aspergillus oryzae strain.
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Progenin III, one of the most active spirostanol saponins, is a potential candidate for anti-cancer therapy due to its strong antitumor activity and low hemolytic activity. However, the concentration of progenin III is extremely low in natural Dioscorea plants. In this paper, the progenin III
Bioactive saponins from Dioscorea futschauensis.
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A new anti-neoplastic spirostanol saponin, (25S)-spirost-5-en-3 beta, 27-diol-3O-[alpha-L-rhamnopyranosyl(1-->2)-beta-D-glucopyranosyl (1-->3)]-beta-D-glucopyranoside and three known compounds viz. prosapogenin A of dioscin, dioscin and gracilin were isolated from Dioscorea futschauensis by
Improvement of Diosgenin Yield from Dioscorea deltoidea Plant Cell Cultures by Use of a Non-Traditional Hydrolysis Method.
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The attractiveness of fermentor cultures of DIOSCOREA DELTOIDEA Wall. (Dioscoreaceae) as a source of diosgenin has been greatly improved by switching away from the traditional product recovery method that has been used in all previous studies. By using a known but little-used hydrolysis method
The cytotoxicity of methyl protoneogracillin (NSC-698793) and gracillin (NSC-698787), two steroidal saponins from the rhizomes of Dioscorea collettii var. hypoglauca, against human cancer cells in vitro.
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In our continuous studies of anticancer activity of steroidal saponins from the rhizomes of Dioscorea collettii var. hypoglauca (Dioscoreaceae), methyl protoneogracillin (NSC-698793) and gracillin (NSC-698787) were tested for cytotoxicity against human cancer cell lines from leukemia and eight solid
Novel steroidal saponins from Dioscorea esculenta (Togedokoro).
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Fifteen steroidal saponins 1-15, which include 4 furostanol glycosides 1-3 and 15, and 11 spirostanol glycosides 4-14, were isolated from the tubers and leaves of lesser yam (Dioscorea esculenta, Togedokoro). Their structures were identified by nuclear magnetic resonance and liquid chromatography
ESI-QqTOF-MS/MS and APCI-IT-MS/MS analysis of steroid saponins from the rhizomes of Dioscorea panthaica.
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Using high-resolution quadrupole time-of-flight mass spectrometry along with an electrospray ionization source (ESI-QqTOF-MS), accurate molecular weights of 13 steroid saponins extracted from the rhizomes of Dioscorea panthaica were acquired and the corresponding molecular formulae obtained. In
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