Functional properties of starch-chitosan blend bionanocomposite films for food packaging: the influence of amylose-amylo
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ORIGINAL ARTICLE
Functional properties of starch-chitosan blend bionanocomposite films for food packaging: the influence of amylose-amylopectin ratios Pankaj Jha1
Revised: 4 July 2020 / Accepted: 13 November 2020 Ó Association of Food Scientists & Technologists (India) 2020
Abstract The present study is focused on the influence of amylose and amylopectin ratio on crystallinity, water barrier, mechanical, morphological and anti-fungal properties of starch-based bionanocomposite films. The different sources of starch containing various proportion of amylose and amylopectin (high amylose corn starch, 70:30; corn starch, 28:72; wheat starch, 25:75; and potato starch, 20:80) has been incorporated with chitosan (CH) and nanoclay (Na-MMT). Amylose and amylopectin ratio has regulated the orientation of molecular structure in the starch-based films. Experimental results have revealed that the prepared bionanocomposite films that of CS/CH/nanoclay has exhibited higher crystallinity and molecular miscibility among corn starch, with chitosan and nanoclay were confirmed by XRD. CS/CH/nanoclay has exhibited lowest water vapor permeability and highest tensile strength due to molecular space present in corn starch. Fourier transform infrared spectroscopy has confirmed the shift of amine peak to a higher wavenumber indicating a stronger hydrogen bond between starch and chitosan. Finally, the best bionanocomposite films were tested for food packaging applications. Low-density polyethylene has exhibited fungal growth on 5th day when packed with bread slices at 25 °C and 59% RH whereas CS/CH/nanoclay bionanocomposite film did not show the same for at least 20 days. CS/CH/nanoclay film could potentially be useful for active packaging in extending shelf life; maintaining its quality and safety of food products thus substituting synthetic plastic packaging materials. & Pankaj Jha [email protected] 1
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
Keywords Starch Amylose and amylopectin ratio Barrier properties Bionanocomposite films Anti-fungal properties Active packaging Shelf life
Introduction In the past few decades, one major contributor to the present scenario is conventional synthetic plastics as packaging materials major global environmental concern due to its decomposition period ranging from hundreds to sometimes thousands of years (Pagno et al. 2016). Biopolymer-based packaging material is a possible alternative to petrochemical-based plastics that overcomes the problem of biodegradability. Biodegradable polymer has made immense contribution to the development of food packaging industry (Nair et al. 2017). Consumers’ behaviour shows an increase in inclination toward bio based food packaging material as well as environmental friendly with prolonging shelf life during food preservation (Tan et al. 2015). The biodegradable polymer is gaining much attention in the application of food packaging that is a significant contributor to improving food safety, pr
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