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Physicochemical Characteristics of Seafood-Added Kimchi during Fermentation and Its Sensory Properties

수산물 첨가 김치의 이화학적 특성 변화 및 관능성

  • Woo, Minji (Dept. of Food Science and Nutrition, and Kimchi Research Institute, Pusan National University) ;
  • Choi, Jung Ran (Dept. of Food Science and Nutrition, and Kimchi Research Institute, Pusan National University) ;
  • Kim, Mijeong (Dept. of Food Science and Nutrition, and Kimchi Research Institute, Pusan National University) ;
  • Jang, Mi-Soon (Food and Safety Research Center, National Fisheries Research & Development Institute) ;
  • Cho, Eun Ju (Dept. of Food Science and Nutrition, and Kimchi Research Institute, Pusan National University) ;
  • Song, Yeong Ok (Dept. of Food Science and Nutrition, and Kimchi Research Institute, Pusan National University)
  • 우민지 (부산대학교 식품영양학과 및 김치연구소) ;
  • 최정란 (부산대학교 식품영양학과 및 김치연구소) ;
  • 김미정 (부산대학교 식품영양학과 및 김치연구소) ;
  • 장미순 (국립수산과학원 식품안전과) ;
  • 조은주 (부산대학교 식품영양학과 및 김치연구소) ;
  • 송영옥 (부산대학교 식품영양학과 및 김치연구소)
  • Received : 2012.08.20
  • Accepted : 2012.11.08
  • Published : 2012.12.31

Abstract

This study was conducted to investigate the physicochemical characteristics of seafood added kimchi (SAK) during fermentation and its sensory properties. Korean cabbage kimchi (KCK) and four different SAKs were prepared and stored at $5^{\circ}C$ for eight weeks. The SAKs contained pre-treated octopus, squid, abalone, and webfoot octopus added at 12% (w/w) to the brined Korean cabbage. The fermentation patterns of SAKs were similar to those of KCK, indicating that the SAKs followed a typical fermentation process. Comparison of the physicochemical characteristics of SAKs with KCK revealed that the pH and acidity of SAKs was higher. The maximum concentrations of Lactobacillus spp. and Leuconostoc spp. for SAKs ranged from 8.31~8.85 and 7.60~8.14 log CFU/mL, respectively, which were higher than those for KCK. Therefore, the production of organic acids by microorganisms was greater in SAKs, which explained the higher acidities of the SAKs. Nitrogenous compounds hydrolyzed during fermentation, as well as reducing sugars and other nutritious compounds in SAKs might provide a good medium for lactic acid bacterial growth. Sensory evaluation was carried out using optimally ripened kimchi (pH $4.3{\pm}0.1$, acidity $0.7{\pm}0.1$), and the scores for sour taste, sour smell, and carbonated taste were significantly lower for SAKs than KCK. In the preference test, texture and overall acceptability were significantly higher for SAKs than KCK. Significant differences were not observed among SAKs upon subjective and preference evaluations. In conclusion, the fermentation patterns of SAKs were normal, regardless of seafood sources, and their sensory characteristics were comparable to or superior than those of KCK due to free amino acids, nitrogenous compounds produced during the fermentation, and reducing sugar present in the seafood.

문어, 오징어, 전복 및 주꾸미를 첨가하여 담근 수산물 첨가 김치와 일반 배추김치를 $5^{\circ}C$에서 8주간 저장하면서 김치의 관능성 및 이화학적 특성을 관찰하였다. 수산물 첨가 김치의 pH와 산도는 일반 배추김치와 같이 정상 발효 패턴을 나타내었다. 저장기간 중 수산물 첨가 김치의 pH는 일반 배추김치에 비해 높았고 이에 반해 산도는 수산물 첨가 김치가 일반 배추김치보다 높았다. 수산물 김치의 젖산균 최대 균수는 Lactobacillus spp. 8.31~8.85 log CFU/mL, Leuconostoc spp. 7.60~8.14 log CFU/mL로 일반 배추김치에 비해 높았는데, 이는 수산물 첨가 김치의 환원당 함량이 높았기 때문이다. 적숙기(pH $4.3{\pm}0.1$, 산도 $0.7{\pm}0.1%$)에 도달하는 시기는 일반 배추김치, 전복김치 및 주꾸미김치가 저장 2주째, 문어김치 및 오징어김치가 저장 3주째로 나타났다. 과숙기(pH 4.0 이하, 산도 1.0% 이상)는 오징어김치(저장 6주째)를 제외한 모든 군이 저장 8주째로 나타났다. 과숙기의 산도는 일반 배추김치가 가장 낮았다. 적숙기 김치의 관능평가는 객관적 평가의 경우 수산물 첨가 김치의 신맛, 신내 및 탄산미가 일반 배추김치에 비해 유의적으로 낮게 평가되었다. 기호도 평가 항목 중 수산물 첨가 김치의 종합적인 평가는 일반 배추김치에 비해 유의적으로 높게 평가되었고, 특히 김치의 질감이 우수한 것으로 나타났다. 그 외 수산물 첨가 김치의 외관 및 맛은 일반 배추김치와 유사하였으며, 김치냄새는 다소 낮게 평가되었다. 이상의 연구 결과를 종합해보면 수산물을 첨가한 김치는 일반 배추김치와 같은 발효양상을 보였으며, 관능평가 결과 수산물 고유의 감칠맛으로 김치의 맛을 더욱 증진시킨 것으로 나타났다.

Keywords

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