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Processing Optimization of Gelatin from Rockfish Skin Based on Yield

  • Kim, Hyung-Jun (Department of Seafood Science and Technology/Institute of Marine Industry, Gyeongsang National University) ;
  • Yoon, Min-Seok (Department of Seafood Science and Technology/Institute of Marine Industry, Gyeongsang National University) ;
  • Park, Kwon-Hyun (Department of Seafood Science and Technology/Institute of Marine Industry, Gyeongsang National University) ;
  • Shin, Joon-Ho (Department of Seafood Science and Technology/Institute of Marine Industry, Gyeongsang National University) ;
  • Heu, Min-Soo (Department of Food and Nutrition/Institute of Marine Industry, Gyeongsang National University) ;
  • Kim, Jin-Soo (Department of Seafood Science and Technology/Institute of Marine Industry, Gyeongsang National University)
  • Received : 2010.01.27
  • Accepted : 2010.03.15
  • Published : 2010.03.31

Abstract

The study was performed to optimize the processing conditions (alkali concentration, extraction time, and temperature) for rockfish skin gelatin based on yield using response surface methodology and comparison of the physicochemical properties with those of rockfish skin gelatin pretreated and extracted under ordinary conditions (alkali treatment concentration: 1.0 M; extraction time: 2 hr; extraction temperature: $60^{\circ}C$). Predicted maximum gelatin yield of 19.1% and gelatin content of 87.8% were obtained by extraction at $106.6^{\circ}C$ for 69.0 min after pretreatment with 1.1 M calcium hydroxide. Yield of gelatin extracted under high temperature/high pressure (G-HT/HP) was 54% higher than that extracted under ordinary temperature/time (G-OT/T). However, G-HT/HP was inferior in gel strength and gelling point to (G-OT/T), but comparable in transmission. Based on the physicochemical properties, G-HT/HP was unsuitable for use in products requiring higher physical properties, but could be useful for health-functional foods.

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