Journal
FOOD HYDROCOLLOIDS
Volume 36, Issue -, Pages 173-180Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2013.09.024
Keywords
Bighead carp scale; Fish gelatin; Ammonium sulfate fractional precipitation; Gel strength; Structure
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Funding
- National High Technology Research and Development Program of China (863 Program) [2011AA100803]
- Research Fund for the Doctoral Program of Higher Education [20123604110001]
- Jiangxi Province Science and Technology Support Program [20122BBF60060]
- Project of Education Department of Jiangxi Province [GJJ12018]
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Gelatin from bighead carp (Hypophthalmichthys nobilis) scale was extracted with the gel strength of 415.7 +/- 9.9 g. Ammonium sulfate fractional precipitation (ASFP) with different ammonium sulfate saturations (20%, 25%, 30%, 35% and 40%, respectively) separated fish gelatin components with different gel strengths (469.7 +/- 12.0 g, 419.7 +/- 9.9 g, 181.9 +/- 17.7 g, 83.9 +/- 9.9 g and 15.3 +/- 2.1 g, respectively). ASFP did not destroy characteristic FTIR peaks (amide A, amide I, amide II and amide III) and X-ray diffraction peaks (around 7 degrees and 20-21 degrees represented the triple-helix structure and the single left-hand helix chain, respectively) in the fish gelatin. In addition, lower ammonium sulfate saturation precipitated the fish gelatin component with stronger hydrogen bond, more triple-helix structures, higher molecular weight distribution and denser microstructure. Prominently, fish gelatin with higher gel strength had greater amount of high molecular weight components and denser microstructure. (c) 2013 Elsevier Ltd. All rights reserved.
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