Abstract
The crosslinking of gelatin using crosslinking agents based on condensation of the aldehyde groups and ε-amine groups present in lysine and hydroxylysine rests is a very attractive method reported recently. The present work deals with different films prepared from commercial gelatin of type B and animal origin, aiming at an improvement of physical properties. These films were modified by two plasticizing agents (glycerol, GLY, and poly (vinyl alcohol), PVA) and/or crosslinked by glutaraldehyde (GTA). The number of ε-amino groups present in the gelatin chains, before and after modification, was determined by the method of protein dosage using 2,4,6-trinitro benzene sulfonic acid (TNBS). The addition of the plasticizing and/or crosslinking agents induced a decrease in the number of ε-amino-groups due to the fact that these groups are involved in the physical and/or chemical crosslinking reactions occurring among the different components. The variation of the crosslinking ratio was studied as a function of formulation type, crosslinking nature and GTA concentration. The use of microhardness (H) in this study emphasizes the effect of the crosslinking on the improvement of the micromechanical properties. The study of differential scanning calorimetry reveals that crosslinking induces a drastic decrease of crystallinity in the samples.
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FJBC gratefully acknowledges the MINECO, Spain (grant MAT 2013–47898-C2-1-R) for the generous support of this work.
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Chaibi, S., Benachour, D., Merbah, M. et al. The role of crosslinking on the physical properties of gelatin based films. Colloid Polym Sci 293, 2741–2752 (2015). https://doi.org/10.1007/s00396-015-3660-2
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DOI: https://doi.org/10.1007/s00396-015-3660-2