- 著者
- Hashimoto Takaharu Aga Hajime Tabuchi Akihiko Shibuya Takashi Chaen Hiroto Fukuda Shigeharu Kurimoto Masashi
- 出版者
- 日本生薬学会
- 雑誌
- 生薬學雜誌 (ISSN:13403443)
- 巻号頁・発行日
- vol.52, no.6, pp.518-520, 1998-12-20
- 被引用文献数
- 3
An ethanol extract from Brazilian propolis had antibacterial activity on Helicobacter pyroli, from which two active fractions were obtained by silica gel column chromatography. From one fraction, an anti-H. pylori compound was isolated which was identified as 4-hydroxycinnamic acid (p-coumaric acid: 1), and from the other fraction, 3-prenyl-4-hydroxy-cinnamic acid, 3-prenyl-4-dihydrocinnamoloxycinnamic acid, and 3,5-diprenyl-4-hydroxycinnamic acid were isolated, whose anti-H. pylori activities expressed as the minimal inhibitory concentration (MIC) in μg/ml, were 15.6〜31.3, 62.5, 125, and 250, respectively. 4-Hydroxycinnamic acid derivatives are likely to be major anti-H. pylori compounds in Brazilian propolis.
- 著者
- Maruta Kazuhiko Nakada Tetsuya Kubota Michio Chaen Hiroto Sugimoto Toshiyuki Kurimoto Masashi Tsujisaka Yoshio
- 出版者
- 社団法人日本農芸化学会
- 雑誌
- Bioscience, biotechnology, and biochemistry (ISSN:09168451)
- 巻号頁・発行日
- vol.59, no.10, pp.1829-1834, 1995-10-23
- 被引用文献数
- 40 97
A trehalose-producing bacterium, Arthrobacter sp. strain Q36, was isolated from soil. From a supernatant of the culture broth, two novel enzymes related to trehalose synthesis were partially purified by Sepabeads FP-DA column chromatography. One enzyme catalyzed the conversion of maltopentaose into maltotriosyl trehalose by intramolecular transglycosylation, showing it to be maltooligosyl trehalose synthase. The other hydrolyzed the product transferred by the former into maltotriose and trehalose specifically, showing it to be maltooligosyl trehalose trehalohydrolase. In addition to the bacterial strain isolated, several bacteria kept in our laboratory were found to produce these enzymes. The enzymatic system was proposed to be a novel biosynthesis of trehalose in bacteria involving the following reactions : maltodextrin→maltooligosyl trehalose, maltooligosyl trehalose→maltodextrin + trehalose. When these enzymes acted on amylose simultaneously, the trehalose in the reaction mixture reached more than 80% in content.