Mycoflora Dynamics Analysis of Korean Traditional Wheat-based Nuruk

被引:26
|
作者
Bal, Jyotiranjan [1 ]
Yun, Suk-Hyun [1 ]
Song, Ha-Yeon [2 ]
Yeo, Soo-Hwan [3 ]
Kim, Jae Hyun [3 ]
Kim, Jung-Mi [2 ]
Kim, Dae-Hyuk [1 ]
机构
[1] Chonbuk Natl Univ, Ctr Fungal Pathogenesis, Dept Bioact Mat Sci, Dept Mol Biol, Jeonju 561756, South Korea
[2] Wonkwang Univ, Dept Bioenvironm Chem, Iksan 570749, South Korea
[3] RDA, NAAS, Dept Agrofood Resource, Fermented Food Sci Div, Wanju Gun 565851, South Korea
关键词
wheat; nuruk; mycoflora; Lichtheimia; Aspergillus; BETA-GLUCOSIDASE; PICHIA-ANOMALA; YEAST STRAINS; BACTERIAL; FUNGAL;
D O I
10.1007/s12275-014-4620-0
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The growing popularity of traditional Korean alcoholic beverages has led to a demand for quality enhancement of the traditional starter culture nuruk, which consists primarily of wheat. Therefore, this study focused on mycoflora characterization and the temporal variations in traditional wheat-based nuruks fermented at two representative traditional temperature conditions for 30 days. Nuruk A was fermented at a constant temperature of 36 degrees C for 30 days and nuruk B was fermented at a high initial temperature of 45 degrees C for 10 days followed by 35 degrees C for 20 days. The average mycoflora load in the two different nuruk conditions did not vary significantly between the 0 and 30 day cultures, and a maximum load of 8.39 log CFU/g was observed for nuruk A on culture day 3 and 7.87 log CFU/g for nuruk B on culture day 30. Within two samples, pH was negatively correlated with temporal changes in mycoflora load. The pH of nuruk A was significantly lower than that of nuruk B at all of the time points evaluated. Culture-dependent characterization led to the identification of 55 fungal isolates belonging to 9 genera and 15 species, with the most prominent genera comprising Lichtheimia, Penicillium, Trametes, Aspergillus, Rhizomucor, and Mucor. A total of 25 yeast isolates were characterized belonging to 6 genera and 7 species, the most prominent among which were Rhodotorula, Pichia, Debaryomyces, Saccharomycopsis, and Torulospora. Mycofloral community dynamics analysis revealed that both samples A and B varied considerably with respect to the fungal communities over a span of 30 days.
引用
收藏
页码:1025 / 1029
页数:5
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