Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 59, Issue 24, Pages 13212-13220Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf203055s
Keywords
bioplastics; gliadin films; cinnamaldehyde; cross-linking; enzymatic degradation
Funding
- Spanish Ministry of Science and Innovation [AGL2006-02176, AGL2009-08776]
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The aim of this work has been to study the modification of gliadin films with cinnamaldehyde as a potential crosslinker agent. The molecular weight profile and cross-linking density showed that cinnamaldehyde increased reticulation in the resulting films. The participation of free amino groups of the protein in the newly created entanglements could be a possible mechanism of connection between the polypeptidic chains. The combination of a Schiff base and a Michael addition is a feasible approach to understanding this mechanism. The protein solubility in different media pointed to lower participation by both noncovalent and disulfide bonds in stabilizing the structure of the cross-linked films. The new covalent bonds formed by the cinnamaldehyde treatment hampered water absorption and weight loss, leading to more water-resistant matrices which had not disintegrated after 5 months. The properties of this novel bioplastic could be modified to suit the intended application by using cinnamaldehyde, a naturally occurring compound.
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