The decontamination of spoilage-related microbes in low-alcohol red wine was performed using a serial multiple electrode pulsed electric field (PEF) treatment system. The system consisted of seven electrodes connected in series, and it has been designed to produce square-wave high-voltage pulses of 1 μs duration at various electric field strengths and frequencies for decontamination. The initial counts of aerobic bacteria, yeast and lactic acid bacteria (spoilage-associated microbes) in the wine were 5.56, 5.61 and 5.22 log CFU/mL, respectively. The pattern of decontamination of the spoilage microorganisms followed first-order kinetics and the decontamination effect increased as the field strength and frequency increases. D and D values were inversely related to the electric field strength of the PEF treatment. The yeast exhibited relatively low D-value than the aerobic and lactic acid bacteria. The lowest Z-value was observed for the lactic acid bacteria (24.6 kV/cm) among the spoilage microbes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6233397 | PMC |
| http://dx.doi.org/10.1007/s10068-018-0422-1 | DOI Listing |
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