Pulsed light sterilization of packaging materials

Pulsed light (PL) technology is an emerging processing method that utilizes short duration pulses of intense, broad-spectrum light for the sterilization of surface. Compared to other sterilization methods, such as heat or chemical disinfectant treatment, PL treatment has several advantages; it is faster and leaves no residues. This review discusses the sterilization principles behind PL and its applications for surface sterilization, in especially the decontamination of food packaging materials. The efficacy of PL treatment can be affected by several factors, including the low penetration ability of PL, the shadowing effect of microorganisms, and the composition and properties of the surfaces. The mechanism of microbial inactivation by PL are also summarized. To increase the efficacy of sterilization, PL treatment in combination with chemicals or other decontamination techniques and their applications are also discussed. A complete understanding of the mechanisms of microbial decontamination and the hermetic effects of PL would provide clues on how to increase the efficiency and benefits of this technology for food industry applications.