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A sustainable multifunctional food packaging composite film containing waste garlic peel extract (GPE) and Chitosan (CH) was prepared. This film exhibited antimicrobial potential towards Staphylococcus aureus and Klebsiella pneumoniae. GPE/CH films' morphological, physical, and functional properties were compared to those of CH film. Fourier transform infrared showed the interactions through hydrogen bonding between CH and GPE in the blends that improved the polymers' compatibility. Furthermore, X-ray diffraction analysis validated the compatibility between GPE and CH. GPE/CH films exhibited higher thickness and moisture content than the CH film. Remarkably, GPE/CH films showed lower water vapor barrier properties and higher ultra-violet protection and mechanical strength than CH film. Compact surfaces of the GPE infused CH films were unveiled through Scanning electron microscopy. GPE/CH film showed improved thermal stability after the addition of GPE. MTT method's cytotoxicity study manifested that the GPE/CH films are antioxidant and non-cytotoxic, implicating their biocompatibility and non-toxicity. The results suggest that GPE/CH films can find widespread commercial applications like food packaging materials, replacing the commonly used petrochemical plastics., (Copyright © 2021. Published by Elsevier B.V.)

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Sustainable biocomposites were prepared from the reinforcement of waste medical grade cotton (MGC) in a chitosan matrix. This work presents an investigation of the influence of tannic acid on the chitosan-MGC biocomposite. A series of samples comprising pure chitosan film, MGC and chitosan-MGC biocomposites were crosslinked with tannic acid. The interfacial interaction among the components in biocomposite was established by FTIR and SEM study. The crystallinity of biocomposite was in between chitosan film and MGC sample as shown by XRD. Crosslinked chitosan-MGC biocomposite shows improvement in mechanical properties. The thermal stability of the composite sample is considerable stabler than MGC. [ABSTRACT FROM AUTHOR]

The present work aims to explore the use of a silk filament (SF) as a reinforced material in chitosan matrix to develop low-cost biocomposite using the solution casting technique. The biocomposites were assessed for their physiochemical, mechanical, as well as thermal properties. Fourier-transform infrared study confirmed the chemical interaction between SF and chitosan matrix in biocomposite samples. The morphology of SF in the matrix was discovered by scanning electron microscopy analysis and bundle formation of individual filaments was observed due to the adhesive effect of chitosan solution. The prepared composites with higher loading showed improved mechanical properties. X-ray diffraction study showed increased crystallinity of the biocomposite when compared with the chitosan film (CF). The thermal properties of the biocomposites improved due to the presence of SF. [ABSTRACT FROM AUTHOR]