Effect of gamma irradiation on the stability of anthocyanins and shelf-life of various pomegranate juices.

Food irradiation is a process which exposing food to ionizing radiations and it can improve the safety of food. The pomegranate juice contained considerable anthocyanins and has become a new functional food available for dieting and health. In the present study, the effects of gamma irradiation (0-10kGy) on the stability of anthocyanins and inhibition of microbial growth in pomegranate juice during storage were investigated. Results indicated that the irradiation at all applied doses, significantly reduced total and individual anthocyanins. Moreover, irradiation with higher dosages (3.5-10kGy) had undesirable effect on the total content of anthocyanins. However, irradiation at 2.0kGy had effectively diminished the total bacteria and fungi count and retarding microbial growth during storage. Based on adverse effect of gamma irradiation on ACs content of studied juices, it is not recommended to irradiate pomegranate juice with dosage higher than 2.0kGy.