Ultraviolet-B Radiation Induced Cross-linking Improves Physical Properties of Cold- and Warm-Water Fish Gelatin Gels and Films

:  Cold‐ and warm‐water fish gelatin granules were exposed to ultraviolet‐B radiation for doses up to 29.7 J/cm2. 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...

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Bibliographic Details
Published in:Journal of food science 2012-09, Vol.77 (9), p.E215-E223
Main Authors: Otoni, Caio G., Avena-Bustillos, Roberto J., Chiou, Bor-Sen, Bilbao-Sainz, Cristina, Bechtel, Peter J., McHugh, Tara H.
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Crosslinking
Electrophoresis, Polyacrylamide Gel
Fish
fish gelatin
Fishes
Food industries
Food science
Food Technology - methods
Fundamental and applied biological sciences. Psychology
gel strength
Gelatin - chemistry
gelatin film
Gelatins
Gels - chemistry
Granular materials
Granules
Molecular Weight
Permeability
Physical properties
Rheology
Steam
Strength
Temperature
Tensile Strength
Ultraviolet radiation
Ultraviolet Rays
Ultraviolet-B
Viscosity
Water - chemistry
Water vapor
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Summary::  Cold‐ and warm‐water fish gelatin granules were exposed to ultraviolet‐B radiation for doses up to 29.7 J/cm2. 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.
ISSN:0022-1147
1750-3841
DOI:10.1111/j.1750-3841.2012.02839.x