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Characteristics Of Protein Based Biopolymer And Its Application

893 words - 4 pages

Polymer Enforcement Technique for Protein Material
Proteins are made up by several to thousands repeating unit of amino acid. The main chain of the peptide remains constant throughout the length. The side chain of peptide may consist of one of the twenty different functional groups acting on their reactive side group ‘R’. These side chains determine the shape and properties of the protein, and are responsible for the nearly endless variety of protein sequences, shapes, and functions found in nature [47]. Interaction phenomenon between natural and/or synthetic polymer with side chain groups of peptide allows to develop natural polymer based film with enhanced properties such as elasticity and ...view middle of the document...

The aldehydes such as formaldehyde and glutaraldehyde have widely used as cross linking agents to get better film characteristics. Formaldehyde is the common cross linking agents and it interact with the amino acids of peptide chain such as tryptophan, tyrosine, histidine, arginine and cysteine, amino acids. Glutaraldehyde is more specific than formaldehyde and it can interact with histidine, cysteine, tyrosine and lysine. The effect of aldehydes as a crosslinker on properties of glutenin rich films have been studied by Hernandez-Munoz and colleague [58]. They mentioned that the value of water vapor permeability of gluten rich films decline by around 30% when cross linking agents such as glutaraldehyde, glyoxal and formaldehyde has incorporated. Their results also describe that the formaldehyde gives higher tensile strength values followed by glutaraldehyde and glyoxal. However, aldehydes also have a major disadvantage that is their toxicity. This must be taken into explanation when synthesizing biodegradable materials. Because of the aldehydes’s toxicity many researchers have been trying to use the natural cross linking agents to improve the film properties. The study on the effects of natural cross linking agents (tannins and gallic acid) on the characteristics of thermo moulded films generated from sunflower protein isolate, elucidate the incorporation of tannins and gallic acid in films gives higher tensile strength than for control films [59]. The chestnut and tara tannin gave the largest gain in tensile strength from 2.8 MPa to 4.2 MPa and 4.4 MPa for 3.5% and 6% of tannin respectively. But inferior than the films obtained with aldehydes. This may possibly because they act through weak connections rather than covalent bonds in the case...

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