Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Optimization of γ-Aminobutyric Acid (GABA) Production Using Immobilized Lactobacillus plantarum K154 in Submerged Culture of Ceriporia lacerata

Ceriporia lacerata 배양액과 고정화 Lactobacillus plantarum K154를 이용한 감마아미노뷰티르산 생산 최적화

  • Lee, Eun-Ji (Department of Food Science and Technology, Keimyung University) ;
  • Lee, Sam-Pin (Department of Food Science and Technology, Keimyung University)
  • Received : 2015.01.28
  • Accepted : 2015.05.07
  • Published : 2015.08.31
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Abstract

The production of GABA was optimized by co-cultivation of immobilized Lactobacillus plantarum K154 (ILK) with Ceriporia lacerata cultures. The mycelial culture of C. lacerata was performed in a defined medium containing 3% glucose, 3% soybean flour, and 0.15% $MgSO_4$ in a submerged condition for 7 days at $25^{\circ}C$, resulting in the production of 29.7 g/L mycelia, 3.1 g/L exopolysaccharides, 2% (w/w) ${\beta}$-glucan, 68.96 unit/mL protease, and 10.37 unit/mL ${\alpha}$-amylase. ILK in C. lacerata culture showed viable cell counts of $3.13{\time}10^9CFU/mL$ for immobilized cells and $1.48{\time}10^8CFU/mL$ for free cells after 1 day. GABA production in the free and immobilized cells was 9.96 mg/mL and 6.30 mg/mL, respectively, after 7 days. A recycling test of ILK in the co-fermentation was consequently performed five times at $30^{\circ}C$ for 15 days, resulting in the highest production of GABA. GABA could also be efficiently overproduced by co-cultivation with the produced polysaccharides, ${\beta}$-glucan, peptides, and probiotics.

L. plantarum K154 고정화와 C. lacerata 균사체 배양물을 이용한 혼합발효를 통해서 다당류, ${\beta}$-glucan과 같은 생리활성물질과 기능성 GABA 생산을 최적화 하고자 하였다. C. lacerata 균사체의 최적 배양 조건으로 glucose 3%, soybean flour 3%, $MgSO_4$ 0.15%를 혼합하여 배지로 사용하였고, 5 L jar fermentor를 이용하여 $25^{\circ}C$에서 7일간 진탕 배양하였다. 배양물은 균사체 함량 29.7 g/L, 다당류 함량 3.1 g/L, ${\beta}$-glucan 2% (w/w), protease 활성 68.96 unit/mL, ${\alpha}$-amylase 활성 10.37 unit/mL로 매우 높게 나타났다. C. lacerata 균사체 배양물을 이용하여 젖산세균 고정화에 의한 혼합발효물의 생균수를 측정한 결과, 배양 1일 째 비드 내에서 젖산세균의 수는 $3.13{\time}10^9CFU/mL$로 높게 나타났고, 배지에 유리된 젖산세균의 수는 배양기간 동안 $1.48{\time}10^8CFU/mL$로 유지하였다. 알지네이트 1.5%를 사용하여 비드를 제조하였을 때, GABA 함량을 측정한 결과 배양 7일 째 비드 내에서 6.30 mg/mL, 배지에서 9.96 mg/mL로 높게 나타났다. 젖산세균 고정화의 재사용 가능성을 확인하기 위해 고정화 비드를 5회간 재사용하여 $30^{\circ}C$에서 15일간 혼합발효한 결과, GABA 생산이 급격히 증가하여 배양 기간 동안 유지하였다. 결론적으로 C. lacerata 균사체 배양물로부터 고정화된 젖산세균을 이용한 혼합발효는 고농도 GABA를 포함된 기능성 소재를 생산할 수 있었으며, 이는 식품 및 생물 산업의 원료로 활용이 기대된다.

Keywords

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