Abstract
The purpose of this study was to identify the psychrotrophic lactic acid bacteria isolated from kimchi, a Korean traditional fermented vegetable food. Thirty isolates of psychrotrophic lactic acid bacteria were isolated randomly from kimchi-A and kimchi-B which were fermented at $5{\sim}7^{\circ}C$ for 20 days and 50 days, respectively. Among 30 isolates of lactic acid bacteria isolated from kimchi-A, 14 isolates were identified as Leuconostoc mesenteroides subsp. mesenteroides, 12 as Leuconostoc mesenteroides subsp. dextranicum and 4 as Lactobacillus bavaricus. Among 30 isolates isolated from kimchi-B, 20 isolates were identified as Lactobacillus bavaricus, 3 as Leuconostoc mesenteroides subsp. mesenteroides, 3 as Leuconostoc lactis, 2 as Leuconostoc paramesenteroides and 2 as Lactobacillus homohiochii. Though these strains were identified as above, there were many strains whose sugar fermenting patterns and $NH_3$ producing ability from arginine were inconsistent with those described in Bergey's Manual of Systematic Bacteriology, and some strains identified as Leuconostoc mesenteroides subsp. mesenteroides and Leuconostoc mesenteroides subsp. dextranicum even disclosed such contradictions as the comparisons of sugar fermenting patterns between the strains of different subspecies were much more coincident than those between the same subspecies. As there were difficulties in classifying these psychrotrophic lactic acid bacteria according to the current taxonomic system, further studies were needed to solve these problems.
$5{\sim}7^{\circ}C$의 저온에서 20일 및 50일간 각각 발효된 A 및 B의 두 김치시료에서 저온성 젖산균 각각 30주씩을 무작위로 분리하고 동정을 하였다. 김치 A에서 분리한 30주 중 14주는 Leu. mesenteroides subsp. mesenteroides로, 12주는 Leu. mesenteroides subsp. dextranicum으로, 4주는 Lac. bavaricus로 각각 동정되었고, 김치 B에서 분리한 30주 중 20주는 Lac. bavaricus로, 3주는 Leu. mesenteroides subsp. mesenteroides로, 3주는 Leu. lactis로, 2주는 Leu. paramesenteroides로, 2주는 Lac. homohiochii로 각각 동정되었다. 비록 본 균주들이 위와 같이 동정되었지만 당류발효 pattern과 arginine에서 $NH_3$의 생성능이 Bergey's Manual of Systematic Bacteriology에 기재된 내용과 일치하지 않는 균주가 많았고, Leu. mesenteroides subsp. mesenteroides와 Leu. mesenteroides subsp. dextranicum으로 동정된 균주들 중의 일부는 당류발효 pattern이 동일 subspecies의 균주들 사이보다 다른 subspecies와 더욱 일치하는 모순까지 드러내었다. 이들 저온성 젖산균들을 기존의 체제에 따라 분류함에는 어려움이 따랐으며 이의 해결을 위한 후속연구가 요구되었다.