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      Characterization of Turbot ( Scophthalmus maximus) Skin and the Extracted Acid-Soluble Collagen

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          Abstract

          The biochemical composition of the turbot skin was investigated. The moisture level of the skin was found to be 51.4%. Based on dry matter content, there were relatively high protein (82.1%) and lipid (13.1%) concentrations in the turbot skin. Mineral element analysis revealed that the turbot skin had high Ca content (2069.0 mg kg −1), and the concentrations of toxic heavy metals Hg and Pb were less than 0.005 mg kg −1, which indicates that the turbot skin is a safe resource for collagen production. The sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis showed that acid-soluble collagen (ASC) extracted from the turbot skin was type-I collagen. The imino acid content of the ASC was 241.6 per 1000 amino acids, which suggests a relatively high denaturation temperature. The Fourier transform infrared (FTIR) spectra of ASC reflected a highly stable structure, and the measured denaturation temperature of ASC was 29.5℃, which is higher than those from many temperate fishes. ASC was the most soluble at pH 4.0, and when the pH values were below or above 4.0, the solubility decreased rapidly. The ASC exhibited a relatively high solubility when NaCl concentration was lower than 2%. These results show that turbo skin can be employed as a source for producing collagen with high quality.

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          Author and article information

          Journal
          JOUC
          Journal of Ocean University of China
          Science Press and Springer (China )
          1672-5182
          14 May 2019
          01 June 2019
          : 18
          : 3
          : 687-692
          Affiliations
          1 College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China
          2 Medical College, Qingdao Binhai University, Qingdao 266555, China
          Author notes
          *Corresponding author: LIU Zhen
          Article
          s11802-019-3837-2
          10.1007/s11802-019-3837-2
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2019.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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          Self URI (journal-page): https://www.springer.com/journal/11802

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