To develop the protein materials by the reutilization of dead flatfish from fish farms in Jeju island, the physicochemical characteristics and the functional activities of collagen peptide extracts were investigated. Flatfish skin collagen peptide (FSCP) and flatfish protein hydrolysate (FPH) were manufactured from dead flatfish. The differences of pH, moisture and fat contents between FSCP and FPH were not significant, fat contents were analyzed less than 0.3%, and trans-fat, saturated fat and cholesterol were not detected in both samples. Protein contents of FSCP and FPH showed about 92% and 95%, respectively. In the analysis of amino acids, glycine and hydroxy proline content in FSCP was 24.22% and 6.15%, respectively, showed a typical characteristics of the collagen protein, but essential amino acids contents such as threonine, valine, methionine, isoleusine, leusine and phenylalanine were relatively higher than those of FPH. Average molecular weight of FSCP was measured as 1,102 which was almost equal value with that of tuna collagen peptide. The antioxidant activities and functional properties showed high but did not show significant difference between two samples.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 폐사어의 전처리
  2.2. 껍질의 콜라겐 펩타이드 및 통육(round) 가수분해물의제조
  2.3. 이화학적 특성 측정
  2.4. 기능특성 측정
 3. 결과 및 고찰
  3.1. 이화학적 특성
  3.2. 항산화 기능특성
 4. 결 론
 참 고 문 헌

• 강건희(영산홍어(주)) | Keon-Hee Kang (Yeongsan Skate Co.,Ltd.)
• 이민규(부경대학교 화학공학과) | Min-Gyu Lee (Department of Chemical Engineering, Pukyong National University)
• 감상규(제주대학교 환경공학과) | Sang-Kyu Kam (Department of Environmental Engineering, Jeju National University)
• 정갑섭(동명대학교 식품영양과학과) | Kap-Seop Jeong (Department of Food Science & Nutrition, Tongmyong University) Corresponding author