Abstract
Light emitting diodes (LEDs) with their antibacterial effect present a novel method for food preservation. This effect may be influenced by environmental conditions such as the pH of the food contaminated by the pathogen. Thus, it is necessary to investigate the influence of pH on the antibacterial effect of LEDs before their application to real food matrices. Escherichia coli O157:H7, Salmonella Typhimurium and Listeria monocytogenes in trypticase soy broth were illuminated using 10-W 461 (22.1 mW/cm(2)) and 521 nm (16 mW/cm(2)) LEDs at pH values of 4.5, 6.0, 7.3, 8.0 and 9.5 for 7.5 h at 15 °C. Using the 461 nm LEDs, the populations of E. coli O157:H7 decreased by 2.1 ± 0.02, 1.2 ± 0.08 and 4.1 ± 0.42 log CFU/ml at pH 4.5, 7.3 and 9.5 respectively, after a dosage of 596.7 J/cm(2). For L. monocytogenes, approximately a 5.8 ± 0.03 log reduction was observed after 238.7 J/cm(2) at pH 4.5 using the 461 nm LEDs, while the bacterial concentration was reduced by 1.8 ± 0.01 log at pH 9.5 after 596.7 J/cm(2). Bacterial inactivation using the 521 nm LEDs showed similar trends to the 461 nm LEDs at both acidic and alkaline pH conditions but with lower (1-2 log CFU/ml) reductions after 432 J/cm(2). Lower D-values were observed for L. mon...Continue Reading
References
Sep 11, 2003·Microbiology and Molecular Biology Reviews : MMBR·Paul D Cotter, Colin Hill
Jun 9, 2004·Applied and Environmental Microbiology·Hyun-Gyun Yuk, Douglas L Marshall
Apr 28, 2005·Antimicrobial Agents and Chemotherapy·S A G LambrechtsJ Van Marle
Jul 13, 2006·Journal of Applied Microbiology·S FerroG Jori
Jan 4, 2007·Photomedicine and Laser Surgery·J Stephen Guffey, Jay Wilborn
Sep 4, 2008·Photochemistry and Photobiology·Anat LipovskyRachel Lubart
Feb 10, 2009·Applied and Environmental Microbiology·Michelle MacleanGerry Woolsey
Jan 5, 2010·International Journal of Food Microbiology·Hyun-Gyun YukHoward Q Zhang
Jul 2, 2010·Foodborne Pathogens and Disease·Lynne Elizabeth MurdochJohn G Anderson
Sep 13, 2013·International Journal of Food Microbiology·Vinayak S GhateHyun-Gyun Yuk
Dec 18, 2013·International Journal of Food Microbiology·Lihan Huang
Citations
Dec 15, 2015·Amino Acids·Ine RomboutsJan A Delcour
Apr 8, 2016·Journal of Food Protection·Vinayak GhateHyun-Gyun Yuk
Dec 5, 2016·FEMS Microbiology Letters·M HesslingK Hoenes
Jan 11, 2017·International Journal of Food Microbiology·Min-Jeong KimHyun-Gyun Yuk
Jan 20, 2018·Photochemistry and Photobiology·Rachael M TombMichelle Maclean
Jul 1, 2018·Applied and Environmental Microbiology·Dong HanLuxin Wang
Sep 8, 2019·Applied and Environmental Microbiology·Kristin Sæbø PettersenMarina Aspholm
Apr 16, 2020·Antibiotics·Valeria AngaranoJan F M Van Impe
Feb 22, 2017·Journal of Food Protection·Alison LacombeMelissa Fleck
Nov 25, 2019·Journal of Dairy Science·C Dos AnjosC P Sabino
Dec 19, 2019·Foods·Amritha PrasadM S Roopesh
Jun 14, 2020·Chemistry & Biodiversity·Dantong ZhengLijie Huang
Mar 1, 2019·Comprehensive Reviews in Food Science and Food Safety·Vinayak S GhateHyun-Gyun Yuk
Jan 1, 2017·Comprehensive Reviews in Food Science and Food Safety·Christian JamesStephen J James
Nov 18, 2017·Drug Resistance Updates : Reviews and Commentaries in Antimicrobial and Anticancer Chemotherapy·Yucheng WangTianhong Dai
Feb 2, 2021·Frontiers in Microbiology·Katharina HoenesMartin Hessling
May 29, 2021·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Yuanyuan YanJie Ou
Jun 3, 2021·Biomacromolecules·Lu ChenJing Jing Wang
Jun 1, 2021·Food Research International·Marco CossuAndrea Cossu
Jul 9, 2021·Journal of Photochemistry and Photobiology. B, Biology·Pimonpan PhasupanLoc Thai Nguyen
Jul 13, 2021·Mass Spectrometry Reviews·Giovanni RenzoneAndrea Scaloni
Aug 8, 2021·Foods·Simen AkkermansJan F M Van Impe