Abstract
Sodium benzoate (SB) and potassium sorbate (PS) (3% and 6%) incorporated poly(butylene adipate-co-terephthalate) and thermoplastic starch blends (PBAT/TPS) were produced as antimicrobial biodegradable packaging via blown-film extrusion. SB and PS showed plasticization and water affinity, forming H-bonding reducing α-relaxation temperature. Increased SB and PS up to 6% improved melt flow and gave more homogeneous microstructures with improved polymer compatibility but reduced tensile strength and elongation by up to 42% and 22%, respectively. Increased hydrophilicity due to sorbate and benzoate slightly affected water vapor permeability but significantly decreased oxygen permeability by up to 50%. PBAT/TPS containing 6% PS formed homogeneous film microstructures with the highest transparency, mechanical and barrier properties. Films containing SB and PS ≥ 3% effectively delayed Aspergillus niger and Rhizopus sp. growth with reduced total viable count, yeast and mold in fresh noodles stored at ambient and 85% relative humidity. PS showed better microbial control than SB containing films.
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