Browsing by Author "Luksiene, Zivile"
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- Decontamination of packaging by alabased photosensitizationPublication . Luksiene, Zivile; Paskeviciute, Egle; Nunes, CarlaThis study deals with the development of a novel approach to decontaminate packaging from food pathogens by photosensitization. For this purpose, packaging samples with adhered pathogen were submerged in aminolevulinic acid (ALA solution (3-7.5 mM) for 10 min. Samples were then illuminated with 20 mW cm-2 ( =400 nm) for 5-20 min up to the total exposure of 24 J cm-2. Gram-positive Bacillus cereus and Gramnegative Salmonella enterica were inactivated, with population reductions of 4.2 and 2.5 log, respectively. Inactivation of Gram-positive Listeria monocytogenes biofilms ranged from 1.7-3.1 log. Moreover, our data indicated that the B. cereus spores were susceptible to this treatment, with as much as a 3.1 log reduction in spore population observed after ALA-based photosensitization in vitro and 2.7 log on the surface of packaging material.
- Novel approach to decontaminate fruits and vegetables: combined treatment of pulsed light and PhotosensitizationPublication . Paskeviciute, Egle; Luksiene, Zivile; Nunes, CarlaTaking into account that in post - modern society the consumption of ready to eat meals is increasing all over the world, development of novel, more effective non-thermal technologies to increase food microbial control and reduce the risk of foodborne disease outbreaks becomes issue with global dimension. This study is concerned with the development of novel approach to decontaminate fruits and vegetables from pathogenic and harmful microorganisms.
- Photosensitization as novel appoach to decontminate strawberry fruit surfacesPublication . Paskeviciute, Egle; Luksiene, Zivile; Nunes, CarlaThe methods recently applied for inactivation of food pathogens are not always efficient, safe for humans, or ecologically friendly. In this context, photosensitization might serve as a promising antibacterial tool. Data obtained in this study indicate that the important food pathogens Listeria monocytogenes and Bacillus cereus can be inactivated after photosensitization by 6 log in vitro. Moreover spores of B. cereus as well as biofilms of L. monocytogenes are susceptible to this treatment. Decontamination of strawberries from L. monocytogenes by photosensitization as well as from aerobic mezophylls reached 3 log. The shelf-life of treated berries in comparison with non-treated control strawberries increased by 40%. No significant changes of antioxidant activity in strawberries was detected.