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Identification and characterization of foliar polyphenolic composition in sweetpotato (Ipomoea batatas L.) genotypes.
- M. S. Islam, M. Yoshimoto, S. Yahara, S. Okuno, Koji Ishiguro, O. Yamakawa
- Chemistry, Medicine
- Journal of agricultural and food chemistry
- 15 May 2002
Trials over two years were conducted using 1389 sweetpotato (Ipomoea batatas L.) genotypes collected from all over the world to characterize the polyphenolic composition in sweetpotato leaves. Wide… Expand
Isolation and Characterization of Phenolic Compounds from Magnoliae Cortex Produced in China.
- S. Yahara, T. Nishiyori, A. Koda, T. Nohara, I. Nishioka
- Chemistry
- 25 August 1991
A chemical examination of Magnoliae Cortex produced in China (Magnolia officinalis REHD. et WIL S., Magnoliaceae) has led to the isolation of eighteen new lignans and related compounds [four… Expand
Degradation of ginseng saponins under mild acidic conditions.
Ginseng saponins, ginsenosides Rg (1), Re and Rb (1), decomposed under mild acidic conditions to yield prosapogenins. The structures of the prosapogenins were investigated by (13)C-NMR spectroscopy… Expand
New Acyclic Diterpene Glycosides, Lyciumoside IV-IX from Lycium chinese Mill.
- M. Terauchi, H. Kanamori, M. Nobuso, S. Yahara, K. Yamasaki
- Medicine, Biology
- 1998
- 18
- 5
Steroidal glycosides from Solanum torvum
- S. Yahara, T. Yamashita, Nobuyo Nozawa, T. Nohara
- Chemistry
- 1 November 1996
Abstract Seven new steroidal glycosides, named torvosides A-G, were isolated from the aerial parts and from the roots of Solanum torvum . Their structures were characterized as (25S)-26-O-β- d… Expand
Antimutagenicity of Mono-, Di-, and Tricaffeoylquinic Acid Derivatives Isolated from Sweetpotato (Ipomoea batatas L.) Leaf
- M. Yoshimoto, S. Yahara, S. Okuno, M. S. Islam, Koji Ishiguro, O. Yamakawa
- Chemistry, Medicine
- Bioscience, biotechnology, and biochemistry
- 1 January 2002
The caffeoylquinic acid derivatives, 3-mono-O-caffeoylquinic acid (chlorogenic acid, ChA), 3,4-di-O-caffeoylquinic acid (3,4-diCQA), 3,5-di-O-caffeoylquinic acid (3,5-diCQA), 4,5-di-O-caffeoylquinic… Expand
Dammarane saponins of leaves of Panax pseudo-ginseng subsp. himalaicus
Abstract From dried leaves of Panax pseudo-ginseng subsp. himalaicus collected in Eastern Himalaya, new dammarane saponins, named pseudo-ginsenosides-F 11 and -F 8 were isolated along with the known… Expand
Cyclic peptides, acyclic diterpene glycosides and other compounds from Lycium chinense Mill.
- S. Yahara, C. Shigeyama, T. Ura, K. Wakamatsu, T. Yasuhara, T. Nohara
- Chemistry, Medicine
- Chemical & pharmaceutical bulletin
- 15 April 1993
The chemical structures of four cyclic peptides, lyciumins A-D (1-4), three acyclic diterpene glycosides, lyciumosides I-III (5-7) and other three compounds, a tryptophan derivative glycoside (8), a… Expand
Antimicrobial components in leaves of Lycium chinense Mill.
- M. Terauchi, Hisayuki Kanamori, M. Nobuso, S. Fukuda, S. Yahara, K. Yamasaki
- Chemistry
- 5 December 1998
Biologically active compounds in leaves of Lycium chinense (Lycii Folium) were examined to develop the effective use of this plant as a health food. The methanol extract of Lycii Folium exhibited… Expand
Inhibitory effect of green tea polyphenols on membrane-type 1 matrix metalloproteinase, MT1-MMP.
- N. Oku, M. Matsukawa, +4 authors T. Akizawa
- Chemistry, Medicine
- Biological & pharmaceutical bulletin
- 1 September 2003
Matrix metalloproteinases (MMPs), especially membrane-type 1 matrix metalloproteinase (MT1-MMP), which generates an active form of MMP-2 from proMMP-2, are deeply involved in angiogenesis as well as… Expand