Increased Inactivation of Exopolysaccharide-Producing Pediococcus parvulus in Apple Juice by Combined Treatment with Enterocin AS-48 and High-Intensity Pulsed Electric Field
Abstract:The cyclic peptide bacteriocin enterocin AS-48 was tested (at final concentrations of 0.175, 0.613, and 1.05 AU/ml) against the exopolysaccharide-producing cider spoilage strain Pediococcus parvulus 48 in apple juice in combination with high-intensity pulsed electric field (HIPEF) treatment (35 kV/cm and 150 Hz for 4 μs and bipolar mode). The effect of the combined treatments was studied by surface response methodology, with AS-48 concentration and HIPEF treatment time as process variables. A bacteriocin concentration of 0.613 AU/ml in combination with HIPEF treatment time of 1,000 μs reduced the population of pediococci by 6.6 log cycles in apple juice and yielded an apple juice that was free from pediococci during a 30-day storage period at 4 and 22°C. In contrast, application of HIPEF treatment alone had no effect on the surviving pediococci during storage of juice at 22°C. The combined treatment significantly improved the stability of the juice against spoilage by exopolysaccharide-producing P. parvulus.
Document Type: Research Article
Affiliations: 1: Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071-Jaén, Spain 2: Department of Food Technology, University of Lleida, Avda. Alcalde Rovira Roure 191, 25198 Lleida, Spain 3: Área de Microbiología, Departamento de Ciencias de la Salud. Facultad de Ciencias Experimentales, Universidad de Jaén, 23071-Jaén, Spain
Publication date: January 1, 2010
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