Naturally occurring microorganisms in untreated pomegranate juice are mostly yeasts and molds due to their survival and growth capacity in low-pH environments (Tournas, Heeres, & Burgess, 2006). In addition, these microorganisms could grow under refrigeration (5 °C), causing the spoilage of juice samples during storage. Significant inactivation was found just after LTP and HTP processing, but only the HTP-treatment resulted in a nil microbial count for the two types of juices used. Both thermal treatments prevented microbial growth in pasteurized pomegranate juices stored at 5 °C for 120 days (counts <103 CFU/mL) (Table 2). However, the shelf-life regarding acceptable microbial load of the LTP-treated juices and stored at 25 °C was at least of 21 and 45 days for the cloudy and clarified samples of pomegranate juice (Table 1). The storage temperature had, hence, a significant effect in controlling the growth of survivors (uninjured and sublethally injured cells) and extending the shelf-life of LTP-treated pomegranate juice.
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