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Anti-inflammatory effects and GABA production of old antler and Auricularia auricula-judae extract fermented by Lactobacillus plantarum

녹각 및 목이버섯의 젖산발효를 통한 GABA 생산 및 항염증활성 효과

  • Kwon, soon young (Department of Food Science and Technology, Keimyung University) ;
  • Whang, ki (Department of Food Science and Technology, Keimyung University) ;
  • Lee, sam pin (Department of Food Science and Technology, Keimyung University)
  • 권순영 (계명대학교 식품가공학과) ;
  • 황기 (계명대학교 식품가공학과) ;
  • 이삼빈 (계명대학교 식품가공학과)
  • Received : 2017.01.23
  • Accepted : 2017.04.10
  • Published : 2017.04.30

Abstract

The optimization of lactic acid fermentation was conducted to produce an old antler fortified with functional ingredients. For the over-production of gamma aminobutyric acid (GABA), the extract of old antlers (OA) was fermented by Lactobacillus plantarum EJ2015 with 0.5% YE, 1.5% glucose, and 3.5% MSG at $30^{\circ}C$ for 7 days. The lactic acid fermented OA showed high viable cell counts of $2.0{\times}10^8CFU/mL$, pH 6.56 and 0.77% acidity after 7 days. Addition of Auricularia auricula-judae (AAJ) enhanced the cell growth of L. plantarum EJ2014, resulting in higher viable cell counts of $2.0{\times}10^9CFU/mL$ and acid production after fermentation for 1 day. In particular, acidity was greatly decreased after fermentation for 3 days and 1.4% GABA was produced by converting efficiently mono sodium glutamate as a substrate. Fermented OA/AAJ mixture indicated the reduced cytotoxicity compared with that of unfermented OA. The fermented OA/AAJ mixture indicated anti-inflammatory effect with less production of NO in microphage cells. The production of NO dropped to $17.75{\mu}M$ at 4 mg/mL, and to $5.58{\mu}M$ at 6 mg/mL old antler after fermentation. Thus, lactic acid fermented OA with AAJ could fortify GABA, probiotics and dietary fiber.

본 연구에서는 젖산발효를 통해서 얻어진 목이버섯과 녹각 추출액 혼합물의 항산화 및 생리활성평가를 수행하였다. 녹각 추출액의 GABA생성 최적조건에서 probiotics 및 기능성 강화를 위해 목이버섯을 2.5% 첨가하여 $30^{\circ}C$에서 7일간 젖산발효를 하였다. 발효 7일 pH 5.06, 산도 0.77%로 나타났으며 $1.3{\times}10^8CFU/mL$로 높은 균수를 유지하였고 GABA를 1.4% 생성하는 것으로 나타났다. 목이버섯을 첨가했을 때 젖산균 발효물의 물성이 개선되며 단기간에 고농도의 GABA를 생성하는 것으로 나타났다. 녹각 추출액의 젖산발효물의 세포 생존율을 실험한 목이버섯 2.5% 조건에서 발효 전 6 mg/mL에서 독성이 나타났으나 발효 후 독성이 완화되는 것으로 나타났다. 발효 후 6 mg/mL 농도에서는 $5.58{\mu}M$로 발효 후 NO 생성이 감소되는 것으로 나타났다. 결론적으로 녹각 추출액과 목이버섯 혼합물의 젖산균을 이용한 정치배양을 통해 단기간에 고농도의 GABA 생산이 가능하였으며, 젖산 발효물은 세포독성 완화 효과 및 NO 생성을 저해하는 것으로 나타났다. 따라서 발효물은 GABA, probiotic, 식이섬유 등을 함유하여 기능성 식품소재로 이용이 가능할 것으로 기대된다.

Keywords

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