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Ultraviolet‐B Radiation Induced Cross‐linking Improves Physical Properties of Cold‐ and Warm‐Water Fish Gelatin Gels and Films
Author(s) -
Otoni Caio G.,
AvenaBustillos Roberto J.,
Chiou BorSen,
BilbaoSainz Cristina,
Bechtel Peter J.,
McHugh Tara H.
Publication year - 2012
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1750-3841.2012.02839.x
Subject(s) - gelatin , ultimate tensile strength , rheology , materials science , ultraviolet , irradiation , chemistry , nuclear chemistry , chemical engineering , composite material , organic chemistry , optoelectronics , nuclear physics , engineering , physics
Cold‐ and warm‐water fish gelatin granules were exposed to ultraviolet‐B radiation for doses up to 29.7 J/cm 2 . Solutions and films were prepared from the granules. Gel electrophoresis and refractive index were used to examine changes in molecular weight of the samples. Also, the gel strength and rheological properties of the solutions as well as the tensile and water vapor barrier properties of the films were characterized. SDS‐PAGE and refractive index results indicated cross‐linking of gelatin chains after exposure to radiation. Interestingly, UV‐B treated samples displayed higher gel strengths, with cold‐ and warm‐water fish gelatin having gel strength increases from 1.39 to 2.11 N and from 7.15 to 8.34 N, respectively. In addition, both gelatin samples exhibited an increase in viscosity for higher UV doses. For gelatin films, the cold‐water fish gelatin samples made from irradiated granules showed greater tensile strength. In comparison, the warm‐water gelatin films made from irradiated granules had lower tensile strength, but better water vapor barrier properties. This might be due to the UV induced cross‐linking in warm‐water gelatin that disrupted helical structures.