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Quality Characteristics and Antioxidant Activity of Yogurt Added with Acanthopanax Powder

오가피 분말을 첨가한 요구르트의 품질 특성 및 항산화 활성

  • Oh, HanSeul (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)
  • 오한슬 (서울과학기술대학교 식품공학과) ;
  • 강성태 (서울과학기술대학교 식품공학과)
  • Received : 2015.11.11
  • Accepted : 2015.12.15
  • Published : 2015.12.31

Abstract

This study was performed to examine the quality characteristics and antioxidant activity of the curd yogurt with different contents (0.5-2%, w/w) of acanthopanax powder (AP). The pH decreased with increasing AP content until 16 h, whereas the treated groups showed higher pH levels than the control group after 20 h. The viscosity and the viable cell counts of the yogurt with 2% AP were lower than those of the control group during fermentation, significantly. Color values of AP yogurt were lower in terms of brightness, whereas redness and yellowness values were higher compared to the control group. The 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity and soluble content significantly increased with increasing AP content. Consumer acceptability score of yogurt with 0.5% AP was ranked higher than other yogurts. Yogurt added with 0.5% AP showed no differences in pH, titrable acidity, and viable cell counts compared to the control group after storage at $4^{\circ}C$ for 14 days.

본 연구에서는 오가피 분말의 첨가량을 0.5-2% 첨가한 요구르트를 제조한 후 이에 따른 품질을 평가하였다. 오가피 분말 요구르트의 pH를 측정한 결과, 발효 16시간까지는 오가피 분말의 첨가량이 증가할수록 pH가 낮아졌으나, 발효 20시간 후에는 첨가군의 pH가 대조군보다 높았다. 유산균 수 및 점도는 오가피 분말 2% 첨가군이 대조군보다 유의적으로 낮게 나타났다. 요구르트의 색도의 경우 L값은 오가피 분말 첨가량이 증가할수록 감소하였으나 a값과 b값은 오가피 분말의 첨가량이 증가할수록 증가하였다. DPPH radical 소거능에 대한 항산화활성과 가용성 고형분 함량은 오가피 분말의 첨가량이 많을수록 높아지는 경향을 보였다. 오가피 분말 첨가 요구르트의 관능적 품질평가 결과 0.5% 첨가군의 점수가 가장 높게 나타났다. 발효가 완료된 요구르트를 $4^{\circ}C$에서 14일간 저장한 결과, 오가피 분말 0.5% 첨가군의 pH, 적정산도 및 유산균 수는 대조군과 유의적인 차이가 나타나지 않았다. 이러한 결과로 보아 요구르트 제조 시 0.5%의 오가피 분말 첨가는 요구르트의 발효와 품질 특성에 부정적인 영향을 미치지 않으며 건강기능성 및 기호도를 향상시키는 것으로 판단된다.

Keywords

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