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논문 기본 정보

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학술저널
저자정보
Bal, Jyotiranjan (Department of Molecular Biology, Institute for Molecular Biology and Genetics, Chonbuk National University) Yun, Suk-Hyun (Department of Molecular Biology, Institute for Molecular Biology and Genetics, Chonbuk National University) Chun, Jeesun (Department of Molecular Biology, Institute for Molecular Biology and Genetics, Chonbuk National University) Kim, Beom-Tae (Department of Bioactive Material Sciences, Institute for Molecular Biology and Genetics, Chonbuk National University) Kim, Dae-Hyuk (Department of Molecular Biology, Institute for Molecular Biology and Genetics, Chonbuk National University)
저널정보
한국균학회 Mycobiology Mycobiology 제44권 제3호
발행연도
2016.1
수록면
155 - 161 (7page)

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The most economically important species used in a wide range of fermentation industries throughout Asia belong to Aspergillus section Flavi, which are morphologically and phylogenetically indistinguishable, with a few being toxigenic and therefore a major concern. They are frequently isolated from Korean fermentation starters, such as nuruk and meju. The growing popularity of traditional Korean alcoholic beverages has led to a demand for their quality enhancement, therefore requiring selection of efficient non-toxigenic strains to assist effective fermentation. This study was performed to classify the most efficient strains of Aspergillus section Flavi isolated from various types of traditional wheat nuruk, based on a polyphasic approach involving molecular and biochemical evaluation. A total of 69 strains were isolated based on colony morphology and identified as Aspergillus oryzae/flavus based on internal transcribed spacer and calmodulin gene sequencing. Interestingly, none were toxigenic based on PCR amplification of intergenic regions of the aflatoxin cluster genes norB-cypA and the absence of aflatoxin in the culture supernatants by thin-layer chromatography analysis. Saccharification capability of the isolates, assessed through ${\alpha}-amylase$ and glucoamylase activities, revealed that two isolates, TNA24 and TNA15, showed the highest levels of activity. Although the degrees of variation in ${\alpha}-amylase$ and glucoamylase activities among the isolates were higher, there were only slight differences in acid protease activity among the isolates with two, TNA28 and TNA36, showing the highest activities. Furthermore, statistical analyses showed that ${\alpha}-amylase$ activity was positively correlated with glucoamylase activity (p < 0.001), and therefore screening for either was sufficient to predict the saccharifying capacity of the Aspergillus strain.
#Aflatoxin #Amylase #Aspergillus #Nuruk #Protease

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참고문헌 (25)

참고문헌 신청
Park JW / 1995 / Identification of filamentous molds isolated from Korean traditional nuruk and their amylolytic activities / Korean J Appl Microbiol Biotechnol 23:737~746 google schola Machida M / 2008 / Genomics of Aspergillus oryzae : learning from the history of Koji mold and exploration of its future / DNA Res 15:173~183 google schola Rokas A / 2009 / The effect of domestication on the fungal proteome / Trends Genet 25:60~63 google schola Liang Y / 2009 / Analysis of extracelular proteins of Aspergillus oryzae grown on soy sauce koji / Biosci Biotechnol Biochem 73:192~195 google schola Yu TS / 1998 / Bibliographical study on microorganisms of traditional Korean nuruk(since 1945) / J Korean Soc Food Sci Nutr 27:789~799 google schola

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