Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/134393
Title: PHOTODYNAMIC INACTIVATION BY 405?5 NM LIGHT EMITTING DIODE AGAINST FOODBORNE PATHOGENS ON READY-TO-EAT FOODS AND ITS ANTIBACTTERIAL MECHANISM
Authors: KIM MINJEONG
Keywords: 405 nm light emitting diode, antibacterial mechanism, DNA oxidation, membrane functions, gene expression, foodborne pathogens
Issue Date: 3-Aug-2016
Source: KIM MINJEONG (2016-08-03). PHOTODYNAMIC INACTIVATION BY 405?5 NM LIGHT EMITTING DIODE AGAINST FOODBORNE PATHOGENS ON READY-TO-EAT FOODS AND ITS ANTIBACTTERIAL MECHANISM. ScholarBank@NUS Repository.
Abstract: To investigate a potential of 405±5 nm light emitting diode (LED) as a novel preservation technology, antibacterial effect of LED against foodborne pathogens in phosphate buffered saline (PBS) and ready-to-eat foods and its impact on food qualities were assessed at different temperatures. Its antibacterial mechanism was also elucidated by determining bacterial damages. Results showed that illumination in PBS inactivated more than 90% of all bacterial populations under refrigeration for 7.5 h, while bacterial populations on foods decreased by 84–99% at refrigeration for 48 h, but no antibacterial effect under temperature abuse and room temperature, except for Salmonella spp. on cut-mango. Illumination at refrigeration caused multi-damages to bacterial DNA, RNA, proteins, and cell wall. Moreover, illumination did not significantly impact food qualities during long-term storage. Therefore, this study proposes that 405±5 nm LED at refrigeration could be useful to control foodborne pathogens on ready-to-eat foods without deterioration in retail stores.
URI: http://scholarbank.nus.edu.sg/handle/10635/134393
Appears in Collections:Ph.D Theses (Open)

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