Comparative study of physico-mechanical properties, thermal stability and water absorption of biodegradable films prepared from commercial oxidized and cross-linked cassava starches

Authors

  • Chanakorn Yokesahachart Department of Food Science and Technology, Faculty of Agricultural Technology and Agro-Industry, Rajamangala University of Technology Suvarnabhumi, Phra Nakhon Si Ayutthaya 13000, Thailand
  • Supaporn Pajareon Department of Food Science and Technology, Faculty of Agricultural Technology and Agro-Industry, Rajamangala University of Technology Suvarnabhumi, Phra Nakhon Si Ayutthaya 13000, Thailand

Keywords:

biodegradable films, modified cassava starch, morphology, physico-mechanical properties, thermal stability, water absorption

Abstract

Physico-mechanical properties, thermal stability and water absorption of biodegradable films from chemically modified cassava starches were investigated.  Two types of commercial modified cassava starches as oxidized cassava starch and cross-linked cassava starch were prepared by film casting.  Starch solution was prepared at a concentration of 1% w/w (dry basis) and glycerol was used as a plasticizer.  Unmodified cassava starch was used as the control film.  The obtained films were characterized based on their physical, morphological, mechanical and thermal properties as well as water absorption.  Results indicated that oxidized and cross-linked cassava starch films were easily fabricated using the film casting method with glycerol content at 30% w/w of dried starch weight as a plasticizer.  Thickness of modified cassava starch films ranged 0.06-0.16 mm.  Oxidized cassava starch and cross-linked cassava starch films were transparent.  Cassava starch modified by both oxidation and cross-linking methods resulted in improved tensile strength of films at 2.39-4.59 folds with reduced water absorption by 3.36-3.72 folds.  Chemical modification with oxidation resulted in cassava starch films with high transparency, smooth surface and high strength and stiffness, while cross-linking produced cassava starch films with high extensibility.  Hence, biodegradable films from both oxidized and cross-linked cassava starches have a great potential to be applied to food packaging.

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Published

2020-07-20

How to Cite

Yokesahachart, C. ., & Pajareon, S. . (2020). Comparative study of physico-mechanical properties, thermal stability and water absorption of biodegradable films prepared from commercial oxidized and cross-linked cassava starches. Journal of Current Science and Technology, 10(2), 121–129. Retrieved from https://ph04.tci-thaijo.org/index.php/JCST/article/view/386

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Research Article