T
Toshio Kawasaki
Researcher at Kyushu University
Publications - 143
Citations - 2554
Toshio Kawasaki is an academic researcher from Kyushu University. The author has contributed to research in topics: Glycoside & Dioscoreaceae. The author has an hindex of 28, co-authored 143 publications receiving 2463 citations. Previous affiliations of Toshio Kawasaki include Kumamoto University & Setsunan University.
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Journal ArticleDOI
Detection of Proto-type Compounds of Diosgenin-and Other Spirostanol-Glycosides
Journal ArticleDOI
Structure of desacylsaponins obtained from the bark of Quillaja saponaria
Ryuichi Higuchi,Yoshinori Tokimitsu,Toshihiro Fujioka,Tetsuya Komori,Toshio Kawasaki,David G. Oakenful +5 more
TL;DR: A triterpenoid saponin mixture (so-called quillajasaponin) obtained from the bark of Quillaja saponaria was treated with weak alkali and two major desacylsaponins were isolated as mentioned in this paper.
Journal ArticleDOI
Steroid Saponins and Sapogenins of Underground Parts of Trillium kamtschaticum PALL. II. Pennogenin- and Kryptogenin 3-O-Glycosides and Related Compounds
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Studies on the constituents of Momordica charantia L. I. Isolation and characterization of momordicosides A and B, glycosides of a pentahydroxy-cucurbitane triterpene.
TL;DR: In this paper, two triterpene glycosides, momordicosides A and B, were isolated from the seeds of Momordica charantia L. (Cucurbitaceae).
Journal ArticleDOI
Pericarp Saponins of Akebia quinata DECNE. I. Glycosides of Hederagenin and Oleanolic Acid
Ryuichi Higuchi,Toshio Kawasaki +1 more
Abstract: Two free triterpenoids and twelve triterpenoid saponins were isolated from the fresh pericarps of Akebia quinata DECNE. (Lardizabalaceae). Ten saponins, PA-G, PJ2, PJ3 and PK, of the above twelve were characterized as follows : PA (I), hederagenin (hederag.) 3-O-α-L-ara·pyranoside ; PF (II), hederag. 3-O-β-D-glc·pyr-(1→2)-α-L-ara·pyranoside ; PB (III), oleanolic acid (ol. acid) 3-O-α-L-rha·pyr-(1→2)-α-L-ara·pyranoside ; Pc (VI), hederag. 3-O-β-D-xyl·pyr-(1→3)-α-L-ara·pyranoside ; PD (IX), hederag. 3-O-α-L-rha·pyr-(1→2)-α-L-ara·pyranoside ; PE (XI), ol, acid 3-O-β-D-glc·pyr-(1→2)-α-L-ara·pyranoside ; PG (XIII), hederag. 3-O-β-D-xyl·pyr-(1→3)-α-L-rha·pyr-(1→2)-α-L-ara·pyranoside ; PJz (XV') 3-O-α-L-ara·pyranosyl-hederag. 28-O-α-L-rha·pyr-(1→4)-β-D-glc·pyr-(1→6)-β-D-glc·pyranoside ; PJs (XIX'), 3-O-α-L-rha·pyr-(1→2)-α-L-ara·pyranosyl-ol. acid 28-O-α-L-rha·pyr-(1→4)-β-D-glc·pyr-(1→6)-β-D-glc·pyranoside ; PK (XXI), 3-O-α-L-rha·pyr-(1→2)-α-L-ara·pyranosyl-hederag. 28-O-α-L-rha·pyr-(1→4)-β-D-glc·pyr-(1→6)-β-D-glc·pyranoside. VI, XI and XV'are new members of the group of hederagenin and oleanolic acid oligoglycosides. It is noted that they all have the common unit, 3-O-α-L-ara·pyranoside, and that XV', XIX'and XX, having the same trisaccharide combined with the 28-carboxyl group of the aglycone, are corresponding to I, III and IX, respectively.