Identification and characterization of foliar polyphenolic composition in sweetpotato (Ipomoea batatas L.) genotypes.
- M. Islam, M. Yoshimoto, S. Yahara, S. Okuno, K. Ishiguro, O. Yamakawa
- Biology, MedicineJournal of Agricultural and Food Chemistry
- 15 May 2002
Six different polyphenolic compounds were identified and quantified by NMR, FABMS, and RPHPLC analysis procedures and are reported on in what is the first report ofpolyphenolic compositions in sweetpotato leaves.
Isoflavan and related compounds from Dalbergia odorifera. I
Twenty-seven isoflavonoid monomer and dimer derivatives were obtained from the heartwood of Dalbergia odorifera T. CHEN (Leguminosae). The structure elucidation of twelve monomeric and five dimeric…
Degradation of ginseng saponins under mild acidic conditions.
The structures of the prosapogenins were investigated by (13)C-NMR spectroscopy and Rg (1)-prosapogenin II was shown to be a mixture of ginsenoside Rh (1), and its C-20 epimer, produced by hydrolysis followed by epimerization at C- 20.
Steroidal glycosides from Solanum torvum
New Acyclic Diterpene Glycosides, Lyciumoside IV-IX from Lycium chinese Mill.
In vitro regeneration of the medicinal woody plant Phellodendron amurense Rupr. through excised leaves
- M. Azad, S. Yokota, T. Ohkubo, Y. Andoh, S. Yahara, N. Yoshizawa
- BiologyPlant Cell Tissue and Organ Culture
Shoot organogenesis and plant establishment has been achieved for Phellodendron amurense Rupr. from excised leaf explants. Young leaf explants were collected from in vitro established shoot cultures…
Antimutagenicity of Mono-, Di-, and Tricaffeoylquinic Acid Derivatives Isolated from Sweetpotato (Ipomoea batatas L.) Leaf
- M. Yoshimoto, S. Yahara, S. Okuno, M. Islam, K. Ishiguro, O. Yamakawa
- Chemistry, MedicineBioscience, biotechnology and biochemistry
- 1 January 2002
A comparison of the activities and structures of these compounds suggested that the number of caffeoyl groups bound to quinic acid played a role in the antimutagenicity of the caffeineoylquinic acid derivatives.
Species Differences of Serum Albumins: III. Analysis of Structural Characteristics and Ligand Binding Properties During N-B Transitions
- T. Kosa, T. Maruyama, Norifumi Sakai, N. Yonemura, S. Yahara, M. Otagiri
- ChemistryPharmaceutical Research
- 25 May 1998
The overall mechanisms of the N-B transition may be similar for all the albumins, but its impact is considerably different among the species in terms of both structural characteristics and ligand binding properties.
Dammarane saponins of leaves of Panax pseudo-ginseng subsp. himalaicus
Cyclic peptides, acyclic diterpene glycosides and other compounds from Lycium chinense Mill.
- S. Yahara, C. Shigeyama, T. Ura, K. Wakamatsu, T. Yasuhara, T. Nohara
- ChemistryChemical and 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…