Nonthermal sterilization of dried laver by intense pulsed light with batch system

Abstract

Intense pulsed light (IPL) is a nonthermal technology emerging as an alternative to conventional thermal treatment. The purpose of this study was to investigate the effect of IPL treatment on the microbial inactivation, color alteration, and temperature change of dried laver to evaluate the commercial feasibility of IPL as a sterilization method. IPL treatment (10 min at 1,000 V and 5 pps) resulted in approximately 1.6 log CFU/g decrease in microbial cell viability. After IPL treatment, the surface temperature of dried laver increased by 1.9°C. The color lightness of dried laver increased with increased treatment time, while redness and yellowness decreased. However, these color differences were not significant.