Abstract
Kappa-Carrageenan (KCG) films have been formulated as a packaging material. This study has been conducted to investigate the effect of incorporating \(\hbox {SiO}_{2}\) nanoparticles inside the KCG matrix, with the aim of enhancing the mechanical and antimicrobial properties of KCG for reinforcement purposes. Films were prepared by solution casting technique with 1.0, 3.0 and 5.0 wt% of \(\hbox {SiO}_{2}\) nano-filler content taking neat KCG as the reference for the study. Structural characterizations of the prepared nanocomposite films were carried out by Fourier transform infrared, scanning electron microscope (SEM) and transmission electron microscope (TEM) techniques. SEM and TEM showed homogeneous dispersion of \(\hbox {SiO}_{2}\) nanoparticles in the KCG matrix. The tensile strength increased significantly by introducing the \(\hbox {SiO}_{2}\) nanoparticles into the KCG matrix, in which \(\hbox {KCG}/\hbox {SiO}_{2}\) films have greater tensile strength (53.9 MPa) when compared to the KCG polymer (46.8 MPa). The moisture uptake (MU) of nanocomposites decreased when \(\hbox {SiO}_{2}\) was introduced into the polymer matrix. The barrier property of the prepared KCG-based nanocomposite films decreased oxygen transmission rate with loading of different wt% of \(\hbox {SiO}_{2}\). \(\hbox {SiO}_{2}\) nanoparticle-loaded films produced higher zones of inhibition against Staphylococcus aureus and Escherichia coli strains compared to polymer film. This study was intended to find the applications for KCG films containing \(\hbox {SiO}_{2}\) nanoparticles to enhance the shelf-life of foods in the form of biodegradable wrapper.
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Acknowledgements
We thank the Department of Printing Technology, College of Engineering Guindy, Anna University, Chennai, for providing laboratory facilities and chemicals, and we specially thank Centre for Research, Anna University, for providing financial support (Proc. No: CR/ACRF/2013-10) to carry out the research work.
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Venkatesan, R., Rajeswari, N. & Thendral Thiyagu, T. Preparation, characterization and mechanical properties of k-Carrageenan/\(\hbox {SiO}_{2}\) nanocomposite films for antimicrobial food packaging. Bull Mater Sci 40, 609–614 (2017). https://doi.org/10.1007/s12034-017-1403-3
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DOI: https://doi.org/10.1007/s12034-017-1403-3