Abstract
The release and antimicrobial activity of potassium sorbate (KS) supported in tapioca starch–glycerol edible films prepared by different gelatinization/drying techniques against Zygosaccharomyces bailii was studied. Antimicrobial release in liquid media of different pHs (3.0–6.0) could be approximated to a pseudo first-order kinetic model and was almost accomplished after 30 min. Filmmaking method involving slow gelatinization and drying rate resulted in the highest fraction of KS released at equilibrium. Rate constant was higher when pH of the receiving media was 4.5 and fast gelatinization/fast drying had been used. The effectiveness of the preservative released for controlling the microbial growth depended on the pH of the receiving media, being higher at pH 3.0. No effect of filmmaking method was observed. In relation to film effectiveness as a barrier to contamination, it was observed that the preservative was available to prevent an external Z. bailii contamination and also to control yeast growth in an acidified (pH 4.5) high water activity (a w = 0.980) semisolid product.




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Acknowledgements
We acknowledge the financial support from Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT), Universidad de Buenos Aires (UBA), Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET) and Fundación Antorchas.
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Flores, S., Haedo, A.S., Campos, C. et al. Antimicrobial performance of potassium sorbate supported in tapioca starch edible films. Eur Food Res Technol 225, 375–384 (2007). https://doi.org/10.1007/s00217-006-0427-5
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DOI: https://doi.org/10.1007/s00217-006-0427-5