Abstract
The effects of four variable factors such as protein, sorbitol, montmorillonite (MMT) and chitosan on the properties of multi-composite shark catfish skin gelatin films were evaluated based on Response Surface Methodology (RSM). Incorporation of chitosan had positive effect on tensile strength, Young’s Modulus and water vapor transmission rate (p<0.05). On the other hand, chitosan and MMT had decreased the elongation of the films (p<0.05). The transparency of the gelatin film was increased by the addition of gelatin and chitosan, whereas it was decreased by the addition of MMT. From the present study, it may concluded that gelatin films with good mechanical and barrier properties could be achieved with 4.50% gelatin, 25% sorbitol, 0.37% MMT and 3.25% chitosan. Thus, multicomposite gelatin films with any desirable properties could be formulated based on the results of the response surface methodology and these films shall be suitable for edible films or coatings for fish and other food products in food processing industries.
Highlights
Biodegradable edible films from biological materials have gained importance in recent years to reduce the environmental impact caused by synthetic or petroleum based materials
The multi-composite fish gelatin films produced from different blends with high concentration of chitosan and montmorillonite K10 (MMT) were slightly opaque, homogenous and tough to break
The response surface methodology applied to the model enabled to understand the behavior of different variable factors on the mechanical, physical and barrier properties of the gelatin films
Summary
Biodegradable edible films from biological materials have gained importance in recent years to reduce the environmental impact caused by synthetic or petroleum based materials. Gelatin is obtained from collagen by acidic or alkaline processes [3] It has been studied for its film-forming capacity and applicability as an edible film to protect food against dehydration, light and oxygen [4]. MMT has got a very high elastic modulus and helps to improve the mechanical and physical properties of the films Chitosan is yet another natural polymer obtained by partial deacetylation of chitin and has been identified as a valuable additive because of its film forming ability, antioxidant and antimicrobial properties [15]. This study was undertaken to examine the effect of four variable factors such as gelatin, sorbitol, MMT and chitosan on the mechanical, barrier and physical properties of the multi-composite films formed from shark catfish gelatin using response surface methodology (RSM). J Mol Genet Med S4: 004. doi:10.4172/1747-0862.S4-004
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