Antibacterial Activity of Sweetpotato (Ipomoea batatas L.) Fiber on Food Hygienic Bacteria

The antibacterial activity of sweetpotato fiber against pathogenic Escherichia coli (O157:H7), Salmonella typhimurium, Staphylococcus aureus, and Saccharomyces cerevisiae was investigated using microcalorimetry. The fiber enzymatically prepared from three varieties of sweetpotato storage roots (Koganesengan, Shiroyutaka, and Kyushu No. 124) exhibited bacteriostatic activity against pathogenic E. coli, S. typhimurium, and S. aureus; however, commercial fiber (Satsumaimo fiber) after citric acid fermentation of sweetpotato starch waste did not exhibit antibacterial activity against these bacteria. All sweetpotato fiber, including Satsumaimo fiber, used in this experiment exhibited no antibacterial activity against S. cerevisiae. Chitin exhibited no activity against pathogenic E. coli; however, clear activity of pectin, calcium alginate, and Kyushu No. 124 was observed, in that order. The yield of boiled-water extract from enzymatically prepared fiber was three times greater than that from Satsumaimo fiber. Chemical analysis of the boiled-water-soluble fraction suggested that its main component is pectin. The acid sugar content of sweetpotato fiber was much higher than that of Satsumaimo fiber. The boiled-water-insoluble fraction exhibited bacteriostatic activities, but the boiled-water-soluble fraction did not. Bacteriostatic activity of sweetpotato fiber was suggested to be due to the synergistic effect of cellulose, hemicellulose, and pectin of the fiber

The Interaction of Relativization and Noun Incorporation in Southern Hokkaidō Ainu

This paper focuses on relativization in Southern Hokkaidō Ainu. Specifically, evidential expressions constitute the scope of this study since within this semantic domain a morphosyntactic layout reminiscent of internally-headed relative clauses (IHRCs) is found. Moreover, the structure of some evidential expressions suggests that what gives rise to an IHRC in those instances is classificatory noun incorporation (CNI). Following from past studies on Ainu, where IHRCs and CNI are never discussed, and with reference to cross-linguistic approaches to relativization and incorporation, this study addresses the interaction of these two processes in Southern Hokkaidō Ainu and suggests their reconsideration

Editors\u27Preface

熊本裕先生退職記念号 Festschrift for Professor Hiroshi KUMAMOT