Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Physicochemical Characteristics of Chokong and Soaking Solution on Soaking Period

담금기간에 따른 초콩과 담금액의 이화학적 특성

  • Jo, Yong-Jun (Dept. of Food Science and Technology, Keimyung University) ;
  • Jeong, Yong-Jin (Dept. of Food Science and Technology, Keimyung University) ;
  • Jang, Se-Young (Dept. of Food Science and Technology, Keimyung University) ;
  • Seo, Ji-Hyung (Div. of Food, Beverage & Culinary Art, Yeungnam College of Science & Technology)
  • 조용준 (계명대학교 식품가공학과) ;
  • 정용진 (계명대학교 식품가공학과) ;
  • 장세영 (계명대학교 식품가공학과) ;
  • 서지형 (영남이공대학 식음료조리계열)
  • Published : 2010.02.27
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Abstract

Effects of soaking period on physicochemical characteristics of chokong (black soybean picked in brown rice vinegar) and soaking solution were investigated. The pH and soluble solid contents in soaking solution increased rapidly whereas total acidity decreased during the first 4 days of soaking. The sudden drop of color 'L' and 'b' values in soaking solution occurred one day after start of soaking; in contrast, 'a' value increased by 1 day, and then decreased for soaking periods. The strength and hardness of chokong showed a decreasing trend as soaking for a long time, and the values of chokong were lower than those of control (black soybean soaked in water and freeze dried). The protein bands of chokong for soaking appeared only under 24,000 Da of molecular weight by electrophoresis. The content of total amino acids of chokong pickled for 7 days was 86.86 mg%, about 3 times for 28.36 mg% of raw black soybean. The contents of essential amino acids, especially, leucine and phenylalanine increased greatly in chokong. In vitro digestibility for protein was 62% in raw black soybean and 84% in chokong pickled for 7 days. Therefore, these results may assumed that chokong will be good source of amino acids.

검정콩을 현미식초에 절임한 초콩과 그 담금액의 담금기간에 따른 이화학적 특성 변화를 조사한 결과, 초콩 담금액에서 pH와 가용성 고형분 함량은 담금 4일째까지 급속히 증가한 반면, 총 산도는 감소하는 경향을 나타내었다. 담금액에서 침지 후 1일째에 색도 L값과 b값은 급격히 감소하였으나, a값은 1일째 크게 증가하였다가 담금기간 중 감소하였다. 초콩은 식초에 담금한 기간이 길어질수록 경도 및 강도가 감소하는 경향이었으며, 증류수에 침지한 검정콩(대조군)보다 경도 및 강도가 낮았다. 전기영동에서 담금기간 동안 초콩의 단백질은 대부분 분자량 24,000 Da 이하의 band만을 나타내어 저분자화 경향을 나타내었다. 식초에 7일간 담금한 초콩은 총 아미노산 함량이 86.86 mg%로 생콩의 28.36 mg%보다 약 3배 정도 증가하였고, 필수아미노산, 특히 leucine과 phenylalanine의 함량이 크게 증가하였다. 단백질에 대한 in vitro 소화율 또한 생콩에서 62%에 불과하였으나 식초에 7일간 담금한 초콩은 84%의 소화율을 나타내었다. 이러한 결과는 초콩이 아미노산의 우수한 공급원으로 활용될 수 있음을 제시하는 것으로 사료된다.

Keywords

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