The presence of mitochondria during alcohol fermentation has not been studied. Here, we examined the yeast mitochondrial structure during sake brewing using the green fluorescent protein. Mitochondrial structures were observed throughout brewing and they fragmented as brewing proceeded. This study is the first to show direct evidence of the presence of mitochondria during alcohol fermentation.
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http://dx.doi.org/10.1263/jbb.104.227 | DOI Listing |
J Biosci Bioeng
January 2025
National Research Institute of Brewing, 3-7-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-0046, Japan.
Daki warm treatment (daki-ire) is performed during the process of seed mash preparation in the brewing of Japanese sake in order to promote the saccharification of rice by koji enzyme and to enhance the growth of Saccharomyces cerevisiae. Although it is important to control the growth of lactic acid bacteria in the preparation of kimoto-style seed mash (traditional sake-brewing method), it has not been known whether the transient increase in the temperature and/or appropriate temperature zone produced by daki-ire influences the growth of bacteria. A temperature increase generally helps bacterial growth, but we have found no published investigation of the influence of temperature changes in daki-ire on bacterial growth during the kimoto-style seed mash preparation process.
View Article and Find Full Text PDFJ Biosci Bioeng
January 2025
Industrial Technology Innovation Center of Ibaraki Prefecture, 3781 Nagaoka, Ibaraki-machi, Higashiibaraki-gun, Ibaraki 311-3195, Japan. Electronic address:
Sake brewed using the kimoto-style exhibits high antioxidant capacity and is expected to inhibit the deterioration of sake quality due to oxidation. However, the antioxidant capacity of the added lactic acid bacteria has not been explored. We aimed to screen the lactic acid bacterium, Leuconostoc mesenteroides, with excellent brewing and antioxidant capacity, to develop sake with high antioxidant capacity.
View Article and Find Full Text PDFMass Spectrom (Tokyo)
December 2024
Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Many previous studies have reported various phospholipids and elements that affect sake production; however, it seems to be challenging to investigate individual types in each rice variety due to their high diversity, not to mention their distribution patterns. Since its introduction, mass spectrometry imaging (MSI) has gained attention in various fields as a simple compound visualization technique. The current study highlights the progress of powerful MSI in comprehensively analyzing phospholipids and minerals in brown rice for sake production.
View Article and Find Full Text PDFJ Biosci Bioeng
February 2025
National Research Institute of Brewing, 3-7-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-0046, Japan; Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan. Electronic address:
Mycoscience
May 2024
Department of Bioengineering, Nagaoka University of Technology.
Sake is a Japanese alcoholic beverage produced by fermenting steamed rice and (a culture of on steamed rice) with sake yeast, a strain of Sake yeast strains are important for maintaining product quality and process efficiency. In this study, a strain from Muramatsu Park, Gosen City, Niigata Prefecture was isolated using a loop-mediated isothermal amplification (LAMP) assay. The yeast strain was cultured using the mass spore-cell/cell-cell mating method with a sake yeast haploid.
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