Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Effect of lemon grass hot-water extracts on the quality characteristics and antioxidant activity of curd yogurt

레몬그라스 열수 추출물의 첨가가 호상 요구루트의 품질 특성 및 산화방지 활성에 미치는 영향

  • Kim, MinJu (Department of Food Science and Technology, Seoul National University of Science and Technology) ;
  • Kang, SungTae (Department of Food Science and Technology, Seoul National University of Science and Technology)
  • 김민주 (서울과학기술대학교 식품공학과) ;
  • 강성태 (서울과학기술대학교 식품공학과)
  • Received : 2017.06.15
  • Accepted : 2017.08.23
  • Published : 2017.12.31
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Abstract

This study was performed to examine the quality characteristics and antioxidant activity of curd yogurt with varying content (0.5-2% (w/w)) of lemon grass hot-water extract (LGHWE). The pH decreased with higher LGHWE content until 8 h, with the treated groups showing higher pH values than the control group after 12 h. The viscosity and the viable cell counts of the yogurt with 2% LGHWE were significantly lower than those of the control group during fermentation. Color values of LGHWE yogurt were lower in terms of brightness, whereas redness and yellowness values were higher compared to the control. The DPPH radical scavenging activity and soluble content significantly increased with higher LGHWE content. Consumer acceptability score of yogurt with 0.5% LGHWE was ranked higher than that of other yogurts. Yogurt containing 0.5% LGHWE showed no differences in pH and titratable acidity compared to control after storage at $4^{\circ}C$ for 14 days.

본 연구에서는 레몬그라스 열수 추출물의 첨가량을 0-2% 첨가한 호상요구르트를 제조한 후 이에 따른 품질을 평가하였다. 레몬그라스 열수 추출물 요구르트의 pH를 측정한 결과, 발효 8시간까지는 레몬그라스 열수 추출물의 첨가량이 증가할수록 pH가 낮아졌으나, 발효 12시간 후에는 첨가군의 pH가 대조군보다 높았다. 젖산세균수 및 점성은 레몬그라스 열수 추출물 2% 첨가군이 대조군보다 유의적으로 낮게 나타났다. 요구르트의 색도의 경우 L값은 레몬그라스 열수 추출물 첨가량이 증가할수록 감소하였으나 a값과 b값은 레몬그라스 열수 추출물의 첨가량이 증가할수록 증가하였다. DPPH 라디칼 제거능에 대한 산화방지활성과 가용성 고형물 함량은 레몬그라스 열수 추출물의 첨가량이 많을수록 높아지는 경향을 보였다. 레몬그라스 열수 추출물 첨가 요구르트의 관능적 품질평가 결과 0.5% 첨가군의 전반적 기호도 점수가 가장 높게 나타났다. 발효가 완료된 요구르트를 $4^{\circ}C$에서 14일 간 저장한 결과, 레몬그라스 열수 추출물 0.5% 첨가군의 pH 및 적정산도는 저장초기와 유의적인 차이가 나타나지 않았고, 젖산세균수 및 점성은 유의적으로 증가는 경향이 나타났다. 이러한 결과로 보아 요구르트 제조 시 0.5%의 레몬그라스 열수 추출물 첨가는 요구르트의 발효와 품질특성에 부정적인 영향을 미치지 않으며 건강기능성 및 기호도를 향상시키는 것으로 사료된다.

Keywords

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