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Department of Food Science and Technology, Chonbuk National University, Iksan 570-752, Korea(Received 30, October 2012., Revised 8, December 2012., Accepted 19, December 2012)ABSTRACT: We studied the effect of fermented Rhus verniciflua stem bark (FRVSB) extract (used in herbal med-icine by Koreans) on the microbial growth and enzyme activity of 12 soybean-fermenting microorganisms, includingBacillus spp., lactic acid bacteria, yeast, and other harmful bacteria. The ethanol and methanol extracts of FRVSBinhibited the growth of Bacillus subtilis, Bacillus licheniformis, Bacillus cereus, and Zygosaccharomyces rouxii, andin the disk diffusion assay, their inhibition zone diameters were 11.06-12.23, 12.32-18.38, 11.47-11.84, and 13.59-14.21mm, respectively. The water extract did not show any inhibitory effect. In fact, the water extract addition enhancedthe growth of B. subtilis and B. licheniformis by 1.3-4.5 fold and that of B. cereus by 1.2-1.4 fold. However, thewater extract did not affect the growth of Lactobacillus plantarum, Lactobacillus mesenteroides, Saccharomyces cer-evisiae, and Escherichia coli. The addition of water extract increased the amylase and protease activity of B. subtilisand B. licheniformis.KEYWORDS : Fomitella fraxinea, FRVSB, Rhus verniciflua, Soybean product

hangug gynnhaghoi ji/han-gukgyunhakoeji

Effect of the Extracts from Fermented-Rhus verniciflua Stem Bark with Fomitella fraxinea on the Growth and Enzyme Activity of Soybean Product-fermenting Microorganisms