Journal of agriculture & life science (농업생명과학연구)

Institute of Agriculture & Life Science, Gyeongsang National University (경상대학교 농업생명과학연구원)
권호 표지

Quality Properties of Commercial Chungkukjang in Korea

국내 시판 청국장의 품질 및 특성

  • Ko, Yu-Jin (Div. of Applied Life Science (BK21 program), Insti. of Agric. & Life Sci., Gyeongsang National Univ.) ;
  • Son, Yong-Hwi (Div. of Applied Life Science (BK21 program), Insti. of Agric. & Life Sci., Gyeongsang National Univ.) ;
  • Kim, Eun-Ja (Div. of Applied Life Science (BK21 program), Insti. of Agric. & Life Sci., Gyeongsang National Univ.) ;
  • Seol, Hui-Gyeong (Div. of Applied Life Science (BK21 program), Insti. of Agric. & Life Sci., Gyeongsang National Univ.) ;
  • Lee, Gyeong-Ran (Div. of Applied Life Science (BK21 program), Insti. of Agric. & Life Sci., Gyeongsang National Univ.) ;
  • Kim, Dong-Hyeon (Korea Jang Cooperative) ;
  • Ryu, Chung-Ho (Div. of Applied Life Science (BK21 program), Insti. of Agric. & Life Sci., Gyeongsang National Univ.)
  • 고유진 (경상대학교 응용생명과학부(BK 21 프로그램).농업생명과학연구원) ;
  • 손용휘 (경상대학교 응용생명과학부(BK 21 프로그램).농업생명과학연구원) ;
  • 김은자 (경상대학교 응용생명과학부(BK 21 프로그램).농업생명과학연구원) ;
  • 설희경 (경상대학교 응용생명과학부(BK 21 프로그램).농업생명과학연구원) ;
  • 이경란 (경상대학교 응용생명과학부(BK 21 프로그램).농업생명과학연구원) ;
  • 김동현 (한국장류협동조합) ;
  • 류충호 (경상대학교 응용생명과학부(BK 21 프로그램).농업생명과학연구원)
  • Received : 2012.01.10
  • Accepted : 2012.02.24
  • Published : 2012.02.28
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Abstract

This study aimed to improve the quality with acomparison of quality characteristics by collecting Chungkukjang in the market, and to establish the foundation data for starter, which support to manufacture standardized Chungkukjang products. Firstly, Chungkukjang was collected from the industrial company and home-made production which located in the several regions of Korea. Moisture contents of collected Chungkukjang were ranged from 56.3 to 62.1% and salinity was 0.23 to 11.51%. Total nitrogen and amino nitrogen contents of Chungkukjang ranged from 5.82 to 8.76% and 173.71 to 2,700.66 mg%, respectively. Nitrogen degradation ratio, which means the proportion of amino nitrogen to total nitrogen, was 2.88~26.93%. Collected Chungkukjang AG and Z have predominant value in histamine and tyramine contents as 755.40 and 1913.51 mg/kg, respectively, and viable cells count in collected Chungkukjang, maximum was $9.6{\times}10^9CFU/g$. As a result, most products showed various properties in flavor and nutrition, and it is supposed to be caused on use of different soybean species and unstandardized fermentation process.

본 연구에서는 국내에서 유통되고 있는 청국장을 수집하고 품질 특성을 분석하였으며, 우수한 품질의 청국장 제조를 위한 종균 개발의 기초 자료로 활용하고자 한다. 먼저 국내에서 시판되는 청국장을 수집하여 분석한 결과, 수분함량은 56.3~62.1%, 염도는 0.23~11.51%, 총질소 함량과 아미노태 질소 함량은 각각 5.82~8.76%, 173.71~2,700.66 mg%를 나타내었다. 총질소에 대한 아미노태 질소 함량의 비를 나타내는 질소분해율은 2.88~26.93%를 나타내었다. 수집된 청국장의 최대 히스타민과 티라민 함량은 각각 755.40, 1913.51 mg/kg로 나타냈다. 청국장의 최대 생균수는 $9.6{\times}10^9CFU/g$이었다. 이상의 결과로 국내 청국장은 종류가 매우 다양하며 제품마다 풍미와 영양성분이 현저한 차이가 있음을 확인하였다. 이는 지역마다 다른 품종의 원료대두의 사용 및 균일화 체계화되지 못한 발효공정에 기인한 것이라 사료된다.

Keywords

Acknowledgement

Supported by : 농림수산식품부

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