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Effect of Adipic Acid on Growth of Psychrotrophic Kimchi Lactic Acid Bacteria and Its Effect on Mulkimchi Fermentation

김치 저온젖산균에 대한 아디프산의 항균효과 및 물김치 저장성 연장효과

  • Kang, Kyung-Ja (Dept. of Food Science and Technology, Chung-Ang University) ;
  • Song, Hyuk-Hwan (Dept. of Food Science and Technology, Chung-Ang University) ;
  • Kim, Young-Bae (Graudate School of Biotechnology, Korea University) ;
  • Jung, Dong-Hyo (Dept. of Food Science and Technology, Chung-Ang University) ;
  • Lee, Chan (Dept. of Food Science and Technology, Chung-Ang University)
  • 강경자 (중앙대학교 식품공학과) ;
  • 송혁환 (중앙대학교 식품공학과) ;
  • 김영배 (고려대학교 생명공학원) ;
  • 정동효 (중앙대학교 식품공학과) ;
  • 이찬 (중앙대학교 식품공학과)
  • Published : 2004.06.01

Abstract

The effects of adipic acid on the growth of psychrotrophic kimchi lactic acid bacteria and on the fermentatation of mulkimchi were investigated. Four Leuconostoc and one Lactobacillus species were isolated from kinnchi fermented for 50 days at 6$^{\circ}C$. The growth inhibition rate of adipic acid on psychrotrophic kimchi lactic acid bacteria and control strain, Leuconostoc mesenteroides KCCM l1324, was gradually increased from 0.1% of adipic acid concentration and its growth inhibition rate on selected strains reached 90% at 0.4% addition of adipic acid. On the bases of these results, the Preservative effect of adipic acid on the fermentation of mulkimchi was investigated for 25 days at 1$0^{\circ}C$. The pH of mulkimchi containing adipic acid was lower than that of control mulkimchi at the beginning of fermentation. However, the pH of the control mulkimchi decreased rapidly and the pH is lower at the end of fermentation than that of all samples containing adipic acid. The control increased rapidly during fermentation at the acidity. Adipic acid inhibited the growth of several microorganisms in mulkimchi including Lactobacilli. The number of Lactobacilli in control mutkimchi increased rapidly at the beginning stage of fermentation and it decreased at the end stage due to lowering of pH. However, that of mulkimchi with adipic acid slowly increased. Addition of 0.2% ethyl alcohol showed increase of preservative effect of 0.1% adipic acid in mulkimchi.

본 연구에서는 김치에서 분리한 5종의 저온성 젖산균들에 대한 아디프산의 항균력을 조사하고, 아디프산의 첨가가 물김치발효에 미치는 영향을 조사하였다. 5종의 김치에서 분리된 저온성 젖산균에 대하여 아디프산은 0.01%농도에서는 항균활성이 거의 나타나지 않았으나 0.1% 농도에서부터 저온성 김치 젖산균의 생육을 상당히 억제하였고,0.4%이상의 농도에서는 균의 생육을 완전히 저해하였다 각 농도별 저온성 김치 젖산균에 대한 저해율은 0.01% 농도에서 10%, 0.2%농도에서는 약 40% 그리고 0.4% 농도에서는 90% 이상이었다. 각각의 김치 젖산균에 대한 생육저해는 0.01%, 0.05%, 0.1%의 농도에서 benzoic acid, sorbic acid, 아디프산의 순으로 강하게 나타났으며, 0.5% 이상에서는 각 유기산에 따른 차이가 없었다. 아디프산 0.1%, 0.2%와 아디프산 0.1%와 ethyl alcohol 2%를 첨가시킨 세가지 물김치를 1$0^{\circ}C$에서 저장시 대조군에서 발효 4일 이후 pH가 크게 감소하여 발효 16일 이후 pH 4.0에 도달하였으나, 아디프산 등의 첨가군에서는 발효 25일 이후에도 pH가 4.3∼4.6의 값을 나타내었다. 25일간의 실험기간 중 12일까지는 아디프산과 ethyl alcohol을 첨가한 김치의 pH는 대조군 김치보다 낮았으며 나머지 기간 동안 일정하게 나타났다. 적정산도의 변화도 pH변화와 유사하게 나타났다. 대조군의 총균수는 발효초기에 급속히 증가하였으며, 발효후기 에는 pH의 저하로 그 수가 감소되었다. 아디프산의 첨가군에서는 총균수가 서서히 증가하였으며, 0.1 % 아디프산과 2% ethyl alcohol이 첨가된 경우는 총균 수의 변화가 크지 않았다. 젖산균의 수는 대조군에서 발효중기까지 그 수가 증가되었으나 발효후기에 감소하였으며, 첨가군에서는 젖산균의 수가 천천히 증가되었다 그러므로 아디프산과 ethyl alcohol의 첨가로 미생물의 생육이 억제되었음을 알 수 있었다.

Keywords

References

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