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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Quality and Functional Components of Commercial Chungkukjang Powders

시판 청국장 분말제품의 품질 및 기능성분

  • Lee, Hyo-Jin (Dept. of Food Science and Technology, Kyungpook National University) ;
  • Cho, Sang-A (Dept. of Food Science and Technology, Kyungpook National University) ;
  • Shin, Jin-Gi (Dept. of Food Science and Technology, Kyungpook National University) ;
  • Kim, Jeong-Sang (Dept. of Animal Science and Biotechnology, Kyungpook National University) ;
  • Jeong, Yong-Jin (Dept. of Food Science and Technology, Keimyung University and Keimyung Foodex Co.) ;
  • Moon, Kwong-Duck (Dept. of Food Science and Technology, Kyungpook National University) ;
  • Kwon, Joong-Ho (Dept. of Food Science and Technology, Kyungpook National University)
  • 이효진 (경북대학교 식품공학과) ;
  • 조상아 (경북대학교 식품공학과) ;
  • 신진기 (경북대학교 식품공학과) ;
  • 김정상 (경북대학교 동물공학과) ;
  • 정용진 (계명대학교 식품가공학과.(주)계명푸덱스) ;
  • 문광덕 (경북대학교 식품공학과) ;
  • 권중호 (경북대학교 식품공학과)
  • Published : 2007.01.31
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Abstract

Five different commercial chungkukjang powders (A$\sim$E) were compared based on their physicochemical, organoleptic and functional properties. The proximate composition of the five samples ranged from 6.07 to 8.54% in moisture, 15.31 to 27.07% in crude protein, 20.19 to 24.75% in crude lipid, 34.84 to 52.41% in carbohydrate, and 3.69 to 5.26% in ash. The pH of the samples ranged from 5.58 to 6.11, and Hunter's colors showed 70.01$\sim$77.22 for L value, 0.91$\sim$4.64 for a value and 23.72$\sim$31.00 for b value depending on the product. The microbial counts were 8.16$\sim$g.60 log CFU/g for aerobic bacteria, $\sim$4.16 log CFU/g for yeasts & molds, and 1.07$\sim$3.88 log CFU/g for coliforms. The contents of reducing sugars and amino-N were 1.89$\sim$2.41% and 2.83$\sim$7.31%, respectively. Free amino acids were mainly composed of glutamic acid, valine, leucine, phenylalanine, and lysine. The amounts of total phenolics and total flavonoids were 108$\sim$302 mg% and 2.73$\sim$9.41, respectively, with some variations in the products. However, the isoflavone contents, which were composed of genistein (63.26$\sim$217.16${\mu}g/g$), daidzein (58.24$\sim$166.65${\mu}g/g$), genistin (2.66$\sim$55.68${\mu}g/g$), and glycitein (12.26$\sim$17.82${\mu}g/g$), were apparently different per product. The sensory scores for color, smell, taste and overall preference for the five chungkukjang products, which were evaluated by panels in their 20's and 30's using 7-point scoring test, ranged from 3.20 to 4.05.

청국장 시료의 고품질화 연구의 일환으로 시판 청국장 분말제품(A$\sim$E사 시료)에 대한 이화학적, 관능적 품질과 몇 가지 기능성분을 분석 비교하였다. 시판 청국장 분말의 일반성분은 수분 6.07$\sim$8.54%, 조단백질 15.31$\sim$27.07%, 조지방질 20.19$\sim$24.75%, 탄수화물 34.84$\sim$52.41%, 조회분 3.69$\sim$5.26% 범위로 나타났다. 시료의 pH는 5.58$\sim$6.11 수준이었으며, 분말의 색상은 시료에 따라 약간의 차이를 보이면서 L값 70.01$\sim$77.22, a값 0.91$\sim$4.64, b값 23.72$\sim$31.00을 나타내었다. 미생물 농도에서 총 세균은 8.16$\sim$9.60 log CFU/g, 곰팡이와 효모는 $\sim$4.16 log CFU/g, 대장균군은 1.07$\sim$3.88 log CFU/g의 분포를 보였다. 시료의 환원당 함량은 1.89$\sim$2.41%, 아미노태질소는 2.83$\sim$7.31%이었으며, 유리아미노산 조성은 glutamic acid, valine, leucine, phenylalanine, lysine 등의 순으로 높게 나타났다. 청국장 분말의 총 페놀 함량은 108$\sim$302 mg%, 총 플라보노이드 함량은 2.73$\sim$9.41 mg%였다. 이소플라본 함량은 제조사별로 큰 차이를 보이면서 genistein 63.26$\sim$217.16 $\mu$g/g, daidzein 58.24$\sim$156.65 $\mu$g/ g, genistin 2.66$\sim$55.68 $\mu$g/g, glycitein 12.26$\sim$17.82 $\mu$g/g 등으로 나타났다. 관능적 품질평가(7점 채점법)에서 20$\sim$30대 패널들은 시료의 색, 냄새, 맛 등 전반적 기호도 평가에서 3.20$\sim$4.05 수준으로 비교적 낮은 평점을 나타내었다.

Keywords

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