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Your search keyword '"Katsuki, Shigeki"' showing total 16 results
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16 results on '"Katsuki, Shigeki"'

2. Identification of Curcuma plants and curcumin content level by DNA polymorphisms in the trnS-trnfM intergenic spacer in chloroplast DNA

Author

Yozo Sakurai, Yui Ajioka, Kaneo Kinjo, Yamada Kazuno, Kaori Nishio, Motoyasu Minami, Kiyoshi Satoh, Hiroaki Kyushima, Masashi Nagai, and Katsuki Shigeki

Subjects
Curcumin, Biology, Polymerase Chain Reaction, law.invention, chemistry.chemical_compound, Intergenic region, Curcuma, RNA, Transfer, law, Polymerase chain reaction, Chromatography, High Pressure Liquid, Genetics, Polymorphism, Genetic, Nucleic acid sequence, DNA, Chloroplast, food and beverages, biology.organism_classification, Molecular biology, Rhizome, Chloroplast DNA, chemistry, Molecular Medicine, DNA, Intergenic, DNA
Abstract

With the goal of developing an accurate plant identification method, molecular analysis based on polymorphisms of the nucleotide sequence of chloroplast DNA (cpDNA) was performed in order to distinguish four Curcuma species: C. longa, C. aromatica, C. zedoaria, and C. xanthorrhiza. Nineteen regions of cpDNA were amplified successfully via polymerase chain reaction (PCR) using total DNA of all Curcuma plants. Using the intergenic spacer between trnS and trnfM (trnSfM), all four Curcuma plant species were correctly identified. In addition, the number of AT repeats in the trnSfM region was predictive of the curcumin content in the rhizome of C. longa.

Published
2008

10. Methyl Caffeate as an α-Glucosidase Inhibitor from Solanum torvum Fruits and the Activity of Related Compounds.

Author

Takahashi, Keisuke, Yoshioka, Yasuyuki, Kato, Eisuke, Katsuki, Shigeki, Iida, Osamu, Hosokawa, Keizo, and Kawabata, Jun

Subjects
METHYLTRANSFERASES, GLUCOSIDASE inhibitors, SOLANUM, SUCROSE, MALTOSE, HYPOGLYCEMIC agents
Abstract

The article discusses a study which examines the effectiveness of methyl caffeate as an α-glucosidase inhibitor from a Solanum torvum fruit. Findings reveal that methyl caffeate had significant structure for maltase and sucrase inhibition. It indicates that its inhibitory action against α-glucosidase could be a good prospect for Solanum torvum fruit as an antidiabetic element.

Published
2010
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13. Analysis of saponins of wild Panax ginseng.

Author

YAMAGUCHI, HIROYUKI, primary, MATSUURA, HIROMICHI, additional, KASAI, RYOJI, additional, TANAKA, OSAMU, additional, SATAKE, MOTOYOSHI, additional, KOHDA, HIROSHI, additional, IZUMI, HIROMASA, additional, NUNO, MARIKO, additional, KATSUKI, SHIGEKI, additional, ISODA, SUSUMU, additional, SHOJI, JUNZO, additional, and GOTO, KATSUMI, additional

Published
1988
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14. Studies on the constituents of Atractylodes lancea.

Author

YAHARA, Shoji, primary, HIGASHI, Tomoko, additional, IWAKI, Kazue, additional, NOHARA, Toshihiro, additional, MARUBAYASHI, Nobuhiro, additional, UEDA, Ikuhiko, additional, KOHDA, Hiroshi, additional, GOTO, Katsumi, additional, IZUMI, Hiromasa, additional, NUNO, Mariko, additional, KATSUKI, Shigeki, additional, ISODA, Susumu, additional, and SATAKE, Motoyoshi, additional

Published
1989
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15. Methyl caffeate as an alpha-glucosidase inhibitor from Solanum torvum fruits and the activity of related compounds.

Author

Takahashi K, Yoshioka Y, Kato E, Katsuki S, Iida O, Hosokawa K, and Kawabata J

Subjects
Animals, Caffeic Acids, Enzyme Assays, Enzyme Inhibitors chemistry, Enzyme Inhibitors pharmacology, Hypoglycemic Agents antagonists & inhibitors, Hypoglycemic Agents pharmacology, Intestines drug effects, Japan, Rats, Sucrase antagonists & inhibitors, Fruit enzymology, Glycoside Hydrolase Inhibitors, Solanum enzymology
Abstract

In screening experiments for rat intestinal alpha-glucosidase (sucrase and maltase) inhibitors in 325 plants cultivated in Japan's southern island, of Tanegashima, marked inhibition against both sucrase and maltase was found in the extract of the fruit of Solanum torvum. Enzyme-assay guided fractionation of the extract led to the isolation of methyl caffeate (1) as a rat intestinal sucrase and maltase inhibitor. We examined 13 caffeoyl derivatives for sucrase- and maltase-inhibitory activities. The results showed that methyl caffeate (1) had a most favorable structure for both sucrase and maltase inhibition, except for a higher activity of methyl 3,4,5-trihydroxycinnamate (14) against sucrase. Its moderate inhibitory action against alpha-glucosidase provides a prospect for antidiabetic usage of S. torvum fruit.

Published
2010
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16. Phenylpropanoid derivatives from edible canna, Canna edulis.

Author

Yun YS, Satake M, Katsuki S, and Kunugi A

Subjects
Benzofurans chemistry, Benzofurans isolation & purification, Caffeic Acids chemistry, Caffeic Acids isolation & purification, Chromatography, High Pressure Liquid, Cinnamates chemistry, Cinnamates isolation & purification, Depsides, Esters isolation & purification, Magnetic Resonance Spectroscopy, Molecular Structure, Optical Rotation, Rosmarinic Acid, Esters chemistry, Marantaceae chemistry, Phenylpropionates chemistry, Sucrose chemistry
Abstract

Two phenylpropanoid sucrose esters were isolated from dry rhizomes of Canna edulis Ker Gawl., along with a known phenylpropanoid sucrose ester and four known phenylpropanoids. On the basis of analysis of spectroscopic data and chemical evidence, these two phenylpropanoid sucrose esters were shown to be 3-O-p-coumaroyl-6-O-feruloyl-beta-D-fructofuranosyl 6-O-acetyl-alpha-D-glucopyranoside and 3,6-di-O-p-coumaroyl-beta-D-fructofuranosyl 6-O-acetyl-alpha-D-glucopyranoside.

Published
2004
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