The Experts below are selected from a list of 3600 Experts worldwide ranked by ideXlab platform
Masayuki Yoshikawa - One of the best experts on this subject based on the ideXlab platform.
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hydrangeamines a and b novel polyketide type pseudoalkaloid coupled Secoiridoid glycosides from the flowers of hydrangea macrophylla var thunbergii1
Tetrahedron Letters, 2013Co-Authors: Seikou Nakamura, Hisashi Matsuda, Masayuki YoshikawaAbstract:Abstract Two novel Secoiridoid glycosides with a pyridine ring named hydrangeamines A and B have been isolated from the flowers of Hydrangea macrophylla SERINGE var. thunbergii MAKINO (Saxifragaceae). The absolute stereostructures of the two hydrangeamines were characterized on the basis of chemical and physiochemical analyses, which included the application of CD for the 4,5-dihydro-[6H]-pyrano chromophore. This is the first isolation of the unique polyketide-type pseudoalkaloid-coupled Secoiridoid glycosides.
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Hydrangeamines A and B, novel polyketide-type pseudoalkaloid-coupled Secoiridoid glycosides from the flowers of Hydrangea macrophylla var. thunbergii
Tetrahedron Letters, 2013Co-Authors: Jiang Liu, Hisashi Matsuda, Seikou Nakamura, Masayuki YoshikawaAbstract:Two novel Secoiridoid glycosides with a pyridine ring named hydrangeamines A and B have been isolated from the flowers of Hydrangea macrophylla SERINGE var. thunbergii MAKINO (Saxifragaceae). The absolute stereostructures of the two hydrangeamines were characterized on the basis of chemical and physiochemical analyses, which included the application of CD for the 4,5-dihydro-[6H]-pyrano chromophore. This is the first isolation of the unique polyketide-type pseudoalkaloid-coupled Secoiridoid glycosides. ?? 2012 Elsevier Ltd. All rights reserved.
Vijay Kumar - One of the best experts on this subject based on the ideXlab platform.
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LC-ESI/MS determination of xanthone and Secoiridoid glycosides from in vitro regenerated and in vivo Swertia chirayita
Physiology and Molecular Biology of Plants, 2015Co-Authors: Vijay Kumar, Sheela ChandraAbstract:A rapid analytical method has been developed to determine xanthone and Secoiridoid glycoside in in vitro and in vivo Swertia chirayita extracts. Ultra performance liquid chromatography–electrospray ionization mass spectrometry (LC-ESI/MS) was applied and validated for the analysis of xanthone and Secoiridoid glycoside a potential active component isolated from methanolic extracts of in vitro and in vivo Swertia chirayita plantlets. Chromatographic separation was achieved on a RP-C18 column using gradient elution. Mangiferin (Xanthone), Amarogentin and Swertiamarin (Secoiridoid glycosides) were identified in both the extracts. In the LC/ESI-MS spectra, major [M + H] ^+ and [M + Na] ^+ ions were observed in positive ion mode and provided molecular mass information. An ultra-performance liquid-chromatography in combination with electrospray ionization tandem mass spectrometry involving metal cationisation was successfully utilized for the rapid identification of xanthone and Secoiridoid glycosides. This method is suitable for the routine analysis, as well as for the separation and identification of known and novel Secoiridoid glycoside and xanthone.
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lc esi ms determination of xanthone and Secoiridoid glycosides from in vitro regenerated and in vivo swertia chirayita
Physiology and Molecular Biology of Plants, 2015Co-Authors: Vijay Kumar, Sheela ChandraAbstract:A rapid analytical method has been developed to determine xanthone and Secoiridoid glycoside in in vitro and in vivo Swertia chirayita extracts. Ultra performance liquid chromatography–electrospray ionization mass spectrometry (LC-ESI/MS) was applied and validated for the analysis of xanthone and Secoiridoid glycoside a potential active component isolated from methanolic extracts of in vitro and in vivo Swertia chirayita plantlets. Chromatographic separation was achieved on a RP-C18 column using gradient elution. Mangiferin (Xanthone), Amarogentin and Swertiamarin (Secoiridoid glycosides) were identified in both the extracts. In the LC/ESI-MS spectra, major [M + H] + and [M + Na] + ions were observed in positive ion mode and provided molecular mass information. An ultra-performance liquid-chromatography in combination with electrospray ionization tandem mass spectrometry involving metal cationisation was successfully utilized for the rapid identification of xanthone and Secoiridoid glycosides. This method is suitable for the routine analysis, as well as for the separation and identification of known and novel Secoiridoid glycoside and xanthone.
Sheela Chandra - One of the best experts on this subject based on the ideXlab platform.
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LC-ESI/MS determination of xanthone and Secoiridoid glycosides from in vitro regenerated and in vivo Swertia chirayita
Physiology and Molecular Biology of Plants, 2015Co-Authors: Vijay Kumar, Sheela ChandraAbstract:A rapid analytical method has been developed to determine xanthone and Secoiridoid glycoside in in vitro and in vivo Swertia chirayita extracts. Ultra performance liquid chromatography–electrospray ionization mass spectrometry (LC-ESI/MS) was applied and validated for the analysis of xanthone and Secoiridoid glycoside a potential active component isolated from methanolic extracts of in vitro and in vivo Swertia chirayita plantlets. Chromatographic separation was achieved on a RP-C18 column using gradient elution. Mangiferin (Xanthone), Amarogentin and Swertiamarin (Secoiridoid glycosides) were identified in both the extracts. In the LC/ESI-MS spectra, major [M + H] ^+ and [M + Na] ^+ ions were observed in positive ion mode and provided molecular mass information. An ultra-performance liquid-chromatography in combination with electrospray ionization tandem mass spectrometry involving metal cationisation was successfully utilized for the rapid identification of xanthone and Secoiridoid glycosides. This method is suitable for the routine analysis, as well as for the separation and identification of known and novel Secoiridoid glycoside and xanthone.
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lc esi ms determination of xanthone and Secoiridoid glycosides from in vitro regenerated and in vivo swertia chirayita
Physiology and Molecular Biology of Plants, 2015Co-Authors: Vijay Kumar, Sheela ChandraAbstract:A rapid analytical method has been developed to determine xanthone and Secoiridoid glycoside in in vitro and in vivo Swertia chirayita extracts. Ultra performance liquid chromatography–electrospray ionization mass spectrometry (LC-ESI/MS) was applied and validated for the analysis of xanthone and Secoiridoid glycoside a potential active component isolated from methanolic extracts of in vitro and in vivo Swertia chirayita plantlets. Chromatographic separation was achieved on a RP-C18 column using gradient elution. Mangiferin (Xanthone), Amarogentin and Swertiamarin (Secoiridoid glycosides) were identified in both the extracts. In the LC/ESI-MS spectra, major [M + H] + and [M + Na] + ions were observed in positive ion mode and provided molecular mass information. An ultra-performance liquid-chromatography in combination with electrospray ionization tandem mass spectrometry involving metal cationisation was successfully utilized for the rapid identification of xanthone and Secoiridoid glycosides. This method is suitable for the routine analysis, as well as for the separation and identification of known and novel Secoiridoid glycoside and xanthone.
Yoshiki Kashiwada - One of the best experts on this subject based on the ideXlab platform.
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Rigenolides D-H, norSecoiridoid and Secoiridoids from Gentiana rigescens Franch.
Journal of Natural Medicines, 2018Co-Authors: Yoshihiro Suyama, Kazuyoshi Kawazoe, Kotaro Murakami, Shunlin Li, Naonobu Tanaka, Yoshiki KashiwadaAbstract:Five new compounds, rigenolides D-H (1-5), were isolated from the aerial parts of Gentiana rigescens Franch. Their structures were assigned by detailed spectroscopic analyses and chemical conversions. Rigenolides D (1) and E (2) were elucidated to be a Secoiridoid and a norSecoiridoid, respectively, possessing a dienone moiety in common. Rigenolides F-H (3-5) were assigned as acylated Secoiridoid glucosides.
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rigenolide a a new Secoiridoid glucoside with a cyclobutane skeleton and three new acylated Secoiridoid glucosides from gentiana rigescens franch
Fitoterapia, 2013Co-Authors: Yoshihiro Suyama, Shinichiro Kurimoto, Kazuyoshi Kawazoe, Kotaro Murakami, Shunlin Li, Yoshihisa Takaishi, Yoshiki KashiwadaAbstract:Rigenolide A (1, a new Secoiridoid glucoside with a cyclobutane skeleton and three new acylated Secoiridoid glucosides, 2'-(2,3-dihydroxybenzoyl)-gentiopicroside (2), 2'-(2,3-dihydroxybenzoyl)-swertiamarin (3), 3'-(2,3-dihydroxybenzoyl)-sweroside (4), along with two noriridoids (7 and 8) and two known Secoiridoid glucosides (5 and 6), were isolated from Gentiana rigescens Franch. The structures of new compounds were elucidated by extensive spectroscopic analyses. The isolated compounds were evaluated for DPPH free-radical scavenging activity. (C) 2013 Elsevier B.V. All rights reserved.
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conjugates of a Secoiridoid glucoside with a phenolic glucoside from the flower buds of lonicera japonica thunb
Phytochemistry, 2013Co-Authors: Yoshiki Kashiwada, Shinichiro Kurimoto, Yuka Omichi, Hirofumi Shibata, Yoshiyuki Miyake, Tsukasa Kirimoto, Yoshihisa TakaishiAbstract:Secoiridoid glucosides, including two conjugates with a phenolic and two conjugates with a nicotinic acid derivative (3 and 4), together with seven known Secoiridoid derivatives, were isolated from flower buds of Lonicera japonica. The structures were elucidated by spectroscopic analyses. Anti-influenza activities of six isolated compounds were also evaluated by plaque assay and neuraminidase inhibitory assay.
Yang Chongren - One of the best experts on this subject based on the ideXlab platform.
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Secoiridoid coumarin and Secoiridoid coumarin glucosides from fraxinus chinensis
Phytochemistry, 1992Co-Authors: Hiroshi Kuwajima, Kiyokazu Takaishi, Kenichiro Inoue, Tetsuro Fujita, Masami Morita, He Zhengdan, Yang ChongrenAbstract:Besides the known glucosides, oleuropein, neooleuropein and cichoriin, a new Secoiridoid glucoside, frachinoside, was isolated from the leaves of Fraxinus chinensis and its structure elucidated.
