Nippon Shokuhin Kagaku Kogaku Kaishi
Online ISSN : 1881-6681
Print ISSN : 1341-027X
ISSN-L : 1341-027X
Volume 67 , Issue 2
Showing 1-3 articles out of 3 articles from the selected issue
  • Makoto Shimoyamada
    2020 Volume 67 Issue 2 Pages 45-57
    Published: February 15, 2020
    Released: February 27, 2020

    Soymilk production is increasing year-on-year due to being perceived as a good way to obtain many important functional dietary components. Indeed, compared to bovine milk, soymilk production is expected to increase in the future. Considering the balance between supply and demand for protein sources, replacing some meat protein with soybean protein by improving the quality of soybean product is considered valuable. Consequently, this review will examine and summarize the progress of research being conducted on soymilk. A knowledge of soymilk requires an understanding of its structure, and numerous approaches have been taken in this regard. Investigations on heating, milling and extraction in soymilk processing are considered essential. Further, investigations on secondary processing of soymilk, such as concentration, membrane treatment, drying, and freezing are also introduced.

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  • Chiaki Ishikawa, Shizusa Kodama, Ryoji Takagaki, Yasujiro Morimitsu
    2020 Volume 67 Issue 2 Pages 58-66
    Published: February 15, 2020
    Released: February 27, 2020

    Manninotriose is a characteristic trisaccharide contained in fermented soybean foods, and is produced by desorption of one molecule of fructose from stachyose. In this study, we examined the manninotriose content in several kinds of commercially available fermented soybean foods and homemade foods, such as natto, miso, and tempeh, to clarify the factors affecting manninotirose production. The water-soluble fraction was obtained from both purchased or homemade fermented food, and the oligosaccharide contents were measured using high-performance liquid chromatography. We observed difference in manninotriose content among different kinds of fermented soybean food, which suggests that production of manninotriose is dependent on the microorganisms involved in the fermentation. Manninotriose concentration differed among natto, miso and tempeh in decreasing order. This tendency shows that natto has higher production efficiency of manninotriose, defined as the ratio of manninotriose to the initial stachyose content in the molar basis. The time course study of fermentation demonstrated that manninotriose concentration increased with degradation of stachyose, and the concentration of manninotriose was maintained during fermentation and storage. It was suggested that the factors affecting manninotriose production were the difference in stachyose content in the soybeans used as raw materials, the types of microorganisms involved in fermentation, and the conditions of fermentation, such as temperature and salinity.

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  • Koji Nomura, Yasuhiko Tago, Toshihide Nakamura
    2020 Volume 67 Issue 2 Pages 67-74
    Published: February 15, 2020
    Released: February 27, 2020

    Ayu-narezushi is a traditional dish from Toyama, Japan that is produced by the fermentation of ayu (Plecoglossus altivelis) with rice-koji. The chemical and microbiological characteristics of ayu-narezushi made with and without koji were investigated to elucidate the effect of koji on fermentation. In both samples during fermentation, lactic acid and free amino acid content increased, and pH, carbohydrates and solid contents decreased. This tendency was more apparent in the samples fermented with koji. In both samples, the number of lactic acid bacteria increased during fermentation, especially in the samples prepared without koji. Throughout the fermentation period, the dominant lactic acid bacteria species in the samples prepared with koji was Lactobacillus sakei. The predominance of L. sakei in the samples prepared without koji gradually decreased during fermentation. It is suggested that the rice-koji used in this study contributed to both the formation of a stable microflora dominated by L. sakei and a pleasant flavor.

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