Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Quality characteristics and antioxidative activity of fermented milk added with hot water extract of Cordyceps militaris grown upon Tenebrio molitor

갈색거저리 유래 밀리타리스 동충하초 열수 추출물을 첨가한 발효유의 품질 특성과 항산화 활성

  • Gim, Do-Woo (Department of Food Science and Technology, Sunchon National University) ;
  • Koo, Hui-Yeon (Insects and Sericultural Research Institute, Jeollanamdo Agricultural Research and Extention Services) ;
  • Kim, Seon-Gon (Insects and Sericultural Research Institute, Jeollanamdo Agricultural Research and Extention Services) ;
  • Park, Jun-Ki (Department of Food Science and Technology, Sunchon National University) ;
  • Kim, Yu-Jin (Department of Food Science and Technology, Sunchon National University) ;
  • Huh, Chang-Ki (Department of Food Science and Technology, Sunchon National University) ;
  • Kim, Yong-Doo (Department of Food Science and Technology, Sunchon National University) ;
  • Kim, Hyun-Jin (Insects and Sericultural Research Institute, Jeollanamdo Agricultural Research and Extention Services)
  • 김도우 (순천대학교 식품공학과) ;
  • 구희연 (전남농업기술원 곤충잠업연구소) ;
  • 김선곤 (전남농업기술원 곤충잠업연구소) ;
  • 박준기 (순천대학교 식품공학과) ;
  • 김유진 (순천대학교 식품공학과) ;
  • 허창기 (순천대학교 식품공학과) ;
  • 김용두 (순천대학교 식품공학과) ;
  • 김현진 (전남농업기술원 곤충잠업연구소)
  • Received : 2017.11.14
  • Accepted : 2017.12.19
  • Published : 2017.12.30
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Abstract

This study was carried out to investigate the physicochemical and antioxidant properties of fermented milk with addition of hot water extract of Cordyceps militaris grown upon Tenebrio molitor. The general components of Cordyceps militaris grown upon Tenebrio molitor are moisture 10.85%, crude protein 18.44%, crude fat 2.07%, crude ash 5.46%. The DPPH radical scavenging activities of different solvents were the highest (74.81 EDA%) with hot water extract sample. The acidity of fermented milk was high with increasing amount of extracts. The pH of fermented milk reached 4.60-4.66 after 4 h of fermentation, and the number of lactic acid bacteria was highest (11.70 log CFU/mL) with 1% fermented milk. The moisture content of fermented milk showed no significant difference. In addition, contents of crude protein were not significantly different according to addition amount. Regarding Hunter's color values, L value decreased as the amount of extract increased, whereas a value and b value increased. The content of free amino acid increased with increasing amount of extract. The DPPH free radical scavenging ability and ABTS free radical scavenging ability of fermented milk were significantly different as the addition amount of extract increased. In the sensory evaluation, fermented milk containing 1% of extract showed the highest preference.

본 연구는 갈색거저리 동충하초 열수 추출물을 첨가한 발효유의 물리화학적 특성과 항산화 효과에 대해 조사하였다. 갈색거저리 동충하초의 일반성분은 수분 10.85%, 조단백질 18.44%, 조지방 2.07%, 조회분 5.46%로 나타났으며 용매별 DPPH 자유 라디칼 소거 활성을 측정한 결과 물 추출물이 74.81 EDA%로 가장 높은 활성을 보였다. 갈색거저리 동충하초 열수 추출물 첨가 발효유의 발효시간에 따른 산도는 동충하초 추출물의 첨가량이 증가할수록 산도가 증가 하였다. pH는 발효 4시간째 4.60-4.66에 도달 하였고, 시료구별 유의적인 차이는 보이지 않았다. 유산균수는 동충하초 1% 첨가 발효유가 11.70 log CFU/mL으로 가장 높았고, 동충하초 0.5% 첨가 발효유가 10.63 log CFU/mL로 가장 낮았다. 동충하초 열수 추출물 첨가량에 따른 발효유의 수분함량은 유의적인 차이를 보이지 않았다. 조단백질의 함량과 조지방 및 조회분 함량 또한 갈색 거저리 첨가량에 따른 유의적인 차이를 보이지 않았다. 발효유의 무기성분 중 K가 3.02-4.35 mg%로 가장 높은 함량을 보였고, Na와 Ca가 2.31-3.10 mg%와 2.23-2.49 mg%로 검출 되었다. 발효유의 색도를 측정한 결과 L 값은 갈색거저리 동충하초 열수추출물의 농도가 증가 할수록 낮아졌고, a 값과 b 값은 갈색거저리 동충하초 추출물의 첨가량이 증가 할수록 값이 높아졌다. 발효유의 유리아미노산은 control군이 829.90 mg%인 것에 반해 갈색거저리 동충하초 추출물 0.5, 1, 3, 5, 8% 시료에서는 1,072.25-1,573.08 mg%로 추출물의 첨가량이 증가 할수록 높은 함량을 보였다. 발효유의 DPPH 자유라디칼 소거능을 측정한 결과 갈색거저리 동충하초 열수 추출물 8% 첨가 발효유가 58.05%로 가장 높게 나타났다. ABTS 자유라디칼 소거능은 동충하초 열수 추출물이 들어가지 않은 대조구에서는 42.60%로 가장 낮은 활성을 보였고, 동충하초 추출물의 첨가량이 증가 할수록 활성이 높아지는 농도에 따른 유의적 차이를 보였다. 갈색거저리 동충하초 열수 추출물을 첨가한 발효유의 관능평가 결과 종합적인 기호도는 1%, 3%, 0.5%, control, 5%, 8% 순으로 높았다. 갈색거저리 동충하초 열수 추출물을 첨가한 발효유의 저장기간에 따른 산도, pH 및 유산균수 변화를 측정한 결과 발효유는 저장기간 15일까지 액상 발효유 품질 규격의 산도, pH 및 유산균수의 기준치에 적합하였다.

Keywords

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