Visible-Light–Based Photoinactivation of Listeria monocytogenes: Time-Dependent Response and Operational Implications
Year: 2026
Type: article
Abstract: Foodborne pathogens remain a major public health concern throughout the farm-to-fork chain. Although thermal decontamination methods are effective, they may compromise product quality in certain foods and increase energy demand, creating the need for alternative technologies that operate with minimal heat load. In this context, 405 nm visible light delivered by violet–blue LEDs has emerged as a promising non-chemical approach for microbial inactivation. Exposure at 405 nm can stimulate endogenous chromophores (e.g., porphyrins), promoting the generation of reactive oxygen species and inducing oxidative damage to critical cellular components. The present study investigates the time dependent photoinactivation response of Listeria monocytogenes under 405 nm LED illumination and discusses its potential applicability for food safety and hygiene practicesExperimental results revealed that a 120-minute exposure to 405 nm LED light achieved a maximum statistically significant reduction of 0.39 log10 CFU/mL (p 0.001) in the Listeria monocytogenes population compared to the non illuminated control group
Authors: Yeliz Durgun, Mahmut Durgun, İsa Karaman
Institutions: Tokat Gaziosmanpaşa Üniversitesi, Yalova University
Language: English
Subfield: Biotechnology
Domain: Life Sciences
Open Access status: bronze
OpenAlex ID: W7169873009