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김치유래 exo-polysaccharide 생성능 Leuconostoc 및 Weissella균을 이용한 발효유 제조

Yogurt Production Using Exo-polysaccharide-producing Leuconostoc and Weissella Isolates from Kimchi

초록

김치에서 분리된 Leuconosotc종과 Weissella종의 프로바이오틱스 특성시험과 요구르트에 접종하여 그 특성에 대해 알아보았다. 김치에서 분리한 균주들 대부분 85% 이상의 생존율을 보이며 산에 대한 높은 저항성을 보였다. 내담즙성 시험에서는 쓸개즙산을 0.3% 첨가한 MRS broth에 분리균주를 접종하여 측정한 결과 한 균주를 제외한 나머지 분리균주들의 생존율이 60% 이상으로 우수한 내성을 보였다. 내산성과 내담즙성 모두 우수한 Leuconostoc 6종, Weissella 3종을 E. coli와 S. Typimurium에 대한 생육억제 능력에 대한 시험을 진행하였다. 최종적으로 Leuconostoc 종인 KC. 5과 Weissella 종인 KC. 10을 최종 선발하였다. 선별된 김치분리균주 KC. 10의 덱스트란슈크레이스 활성 및 EPS 수율은 각각 15.91 DSU/mg protein 및 48.81%으로 일반 type 균주보다도 높았다. 선별 김치분리 균주를 이용하여 제조한 요구르트를 제조한 뒤 측정한 pH는 발효 6시간 때 pH 4.5에 도달하였으며 12일 저장기간 동안에 pH의 큰 변화는 없었다. 산도는 1.2-1.3%로 1.1-1.15% 사이인 대조군에 비해 산도가 높았다. $4^{\circ}C$ 저장기간 동안, 요구르트의 점도는 펙틴을 첨가한 대조군과 비교하였을 때 A12, KC. 5, KC. 10을 접종한 요구르트 중 슈크로스 함량이 4%인 첨가하고 선별된 김치 Leuconostoc 및 Wissella 접종 실험군이 12일째까지 유의적인 차이의 높은 점도를 나타내었다(p<0.05). 요구르트 저장 종료일에 시너레시스 측정값과 EPS수율 결과는 선별 김치균주를 이용한 4% 슈크로스첨가 요구르트는 대조군에 비해 시너레시스가 적은 값을 나타냈으며(p<0.05), EPS수율 또한 시료간 유의적인 차이를 나타내었다(p<0.05). 프로바이오틱 및 요구르트 특성시험을 종합해본 결과 선별 김치균주들을 요구르트 제조 시 혼합균주로 첨가할 경우 EPS 생성으로 인해 프로바이오틱 특성과 프리바이오틱 특성을 동시에 가져 신바이오틱 발효유의 생산이 가능하였다.

Abstract

The purpose of this study was to investigate the effect of exopolysaccharide (EPS)-producing Leuconostoc and Weissella isolates from kimchi as a probiotic starter and replacement for thickening agents such as pectin and gums in yogurt. Potential probiotic isolates were first screened for their acid and bile tolerance, and then evaluated for antimicrobial activity against Escherichia coli and Salmonella Typhimurium. When the selected Leuconostoc or Weissella isolates were co-inoculated in yogurt without a thickening agent, the yogurt with 4% sucrose produced lower syneresis values than the control and had higher EPS yields. The isolates were able to survive at a level of $10^6CFU/mL$ when incubated at $4^{\circ}C$ for 12 days. This study shows that EPS-producing Leuconostoc and Weissella strains have the potential to produce a synbiotic yogurt.

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