Journal
JOURNAL OF FOOD PROTECTION
Volume 73, Issue 1, Pages 39-43Publisher
INT ASSOC FOOD PROTECTION
DOI: 10.4315/0362-028X-73.1.39
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Funding
- Spanish Ministry of Education [AGL2005-07665-C02-02/ALI]
- Generalitat de Catalunya [2005SGR-00058]
- University of Lleida
- University of Jaen
- Pilar Martinez Viedma
- Junta de Andalucia [AGR230]
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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 mu s 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 mu s 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 degrees C. In contrast, application of HIPEF treatment alone had no effect on the surviving pediococci during storage of juice at 22 degrees C. The combined treatment significantly improved the stability of the juice against spoilage by exopolysaccharide-producing P. parvulus.
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