Assessment of quality parameters and microbialcharacteristics of Cape gooseberry pulp (Physalisperuviana L.) subjected to high hydrostaticpressure treatment

Abstract

The aim of this investigation was to determine the effect of high hydrostatic pressure(HHP) on dietary fiber, total phenolic (TPC), vitamin B and E contents, antioxidant capacity(AC) and microbiological characteristics of gooseberry pulp immediately after processing(300–400–500 MPa/1–3–5 min) and after 30 days of storage at 4◦C. Initially, treatment at300 MPa/1 min reduced the microbial counts to non-detectable levels (<1.0 log CFU/g). Anincreased of soluble dietary fiber was observed for all the treatments compared to controlsamples. Moreover, a notable increase in B3and B6contents were observed respect to controlsamples. After refrigerated storage, the insoluble dietary fiber (IDF) to soluble dietary fiber(SDF) ratios were similar to those presented at Day 0. Although the values of TPC were lowerthan at Day 0, an increasing tendency due to treatments was observed. Regarding antioxi-dant capacity, maximum values were observed at 500 MPa/5 min. Retentions higher than 84%for ( + )-tocopherols and -tocopherols were reported. Therefore, HHP technology seemsto be a good option for microbiological stabilization of gooseberry pulp, while it may alsopreserve the most quality this pulp including nutritional, antioxidant and physicochemicalaspects.