Reference organism selection for microwave atmospheric pressure plasma jet treatment of young coconut liquid endosperm

Gabriel, Alonzo A.; Aba, Richard Paolo M.; Tayamora, Daniel Joshua L.; Colambo, Julius Ceasar R.; Siringan, Maria Auxilla T.; Rosario, Leo Mendel D.; Tumlos, Roy; Ramos, Henry J.

doi:10.1016/j.foodcont.2016.04.034

Cited by 29 publications

(8 citation statements)

References 39 publications

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“…In relation to bacterial vegetative cells, Gram-positive bacteria are generally considered to be more resistant to NTAP than Gram-negative bacteria due to the fact that they have a thicker layer of peptidoglycan in their cell wall, which increases the rigidity of cellular envelopes, making them more resistant to mechanical damage and hindering the diffusion of reactive species through the envelopes (Lee et al, 2006; Ziuzina et al, 2014, 2015a; Edelblute et al, 2015; Jayasena et al, 2015; Yong et al, 2015a; Puligundla et al, 2017). However, other studies have found similar resistance to NTAP for particular species of both bacterial groups (Lee et al, 2006; Klämpfl et al, 2012; Tseng et al, 2012; Takamatsu et al, 2015), and, even, some authors have described strains of L. innocua (Baier et al, 2014), L. monocytogenes (Gabriel et al, 2016a), B. cereus (Marsili et al, 2002), S. aureus and E. faecalis (Nishime et al, 2017) as being more sensitive to NTAP than strains of E. coli, S . Typhimurium, S .…”

Section: Factors Determining the Antimicrobial Effectiveness Of Ntapmentioning

confidence: 91%

A Review on Non-thermal Atmospheric Plasma for Food Preservation: Mode of Action, Determinants of Effectiveness, and Applications

et al. 2019

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Non-thermal Atmospheric Plasma (NTAP) is a cutting-edge technology which has gained much attention during the last decade in the food-processing sector as a promising technology for food preservation and maintenance of food safety, with minimal impact on the quality attributes of foods, thanks to its effectiveness in microbial inactivation, including of pathogens, spoilage fungi and bacterial spores, simple design, ease of use, cost-effective operation, short treatment times, lack of toxic effects, and significant reduction of water consumption. This review article provides a general overview of the principles of operation and applications of NTAP in the agri-food sector. In particular, the numerous studies carried out in the last decade aimed at deciphering the influence of different environmental factors and processing parameters on the microbial inactivation attained are discussed. In addition, this review also considers some important studies aimed at elucidating the complex mechanism of microbial inactivation by NTAP. Finally, other potential applications of NTAP in the agri-food sector, apart from food decontamination, are briefly described, and some limitations for the immediate industrial implementation of NTAP are discussed (e.g., impact on the nutritional and sensory quality of treated foods; knowledge on the plasma components and reactive species responsible for the antimicrobial activity; possible toxicity of some of the chemical species generated; scale-up by designing fit-for-purpose equipment).

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Section: Factors Determining the Antimicrobial Effectiveness Of Ntapmentioning

confidence: 91%

A Review on Non-thermal Atmospheric Plasma for Food Preservation: Mode of Action, Determinants of Effectiveness, and Applications

et al. 2019

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“…However, some comparative studies testing the inactivation by NTAP of different bacterial species under identical treatment conditions have found similar resistance for particular species from both Gram-positive and Gram-negative groups [ 7 , 25 , 42 , 43 ]. There exist even some reports of strains of L. innocua [ 10 ], L. monocytogenes [ 44 ], B. cereus [ 45 ], S. aureus and E. faecalis [ 46 ] being more sensitive to NTAP than strains of E. coli, S. Typhimurium, S . Enteritidis, Vibrio parahaemolyticus and Pseudomonas aeruginosa , respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of Non-Thermal Atmospheric Plasma on Food-Borne Bacterial Pathogens on Ready-to Eat Foods: Morphological and Physico-Chemical Changes Occurring on the Cellular Envelopes

Calvo

Prieto

Álvarez‐Ordóñez

et al. 2020

Foods

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Currently, there is a need for new technological interventions to guarantee the microbiological safety of ready-to-eat (RTE) foods. Non-thermal atmospheric plasma (NTAP) has emerged as a promising strategy for inactivating microorganisms on thermo-sensitive foods, and the elucidation of its mechanisms of action will aid the rational optimization and industrial implementation of this technology for potential applications in the food industry. In this study, the effectiveness of NTAP for inactivating strains of Salmonella Enteritidis, Salmonella Typhimurium, Escherichia coli O157:H7 and Listeria monocytogenes contaminating the surface of different sliced RTE foods (“chorizo”, salami, bacon, smoked salmon, tofu and apple) was investigated. In addition, to further assess the bacterial inactivation mechanisms of NTAP, the morphological and physico-chemical damages in bacterial cells were analyzed. NTAP was effective for the surface decontamination of all products tested and, especially, of cut apple, where the microbial populations were reduced between 1.3 and 1.8 log units for the two Salmonella strains and E. coli O157: H7, respectively, after 15 min of exposure. In the rest of foods, no significant differences in the lethality obtained for the E. coli O157:H7 strain were observed, with inactivation rates of between 0.6 and 0.9 log cycles after a 15-min treatment. On the other hand, the strains from the rest of pathogenic microorganisms studied were extremely resistant on tofu, where barely 0.2–0.5 log units of inactivation were achieved after 15 min of plasma exposure. S. Enteritidis cells treated for 10 min exhibited noticeable morphological and structural changes, as observed by transmission electron microscopy, which were accompanied by a loss in membrane integrity, with an increased leakage of intracellular components and uptake of propidium iodide and marked changes in regions of their FTIR spectra indicating major alterations of the cell wall components. Overall, this indicates that loss of viability was likely caused for this microorganism by a significant damage in the cellular envelopes. However, the plasma-treated cells of L. monocytogenes did not show such obvious changes in morphology, and exhibited less marked effects on the integrity of their cytoplasmic membrane, what suggests that the death of this pathogenic microorganism upon NTAP exposure is more likely to occur as a consequence of damages in other cellular targets.

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“…The sensitivity of planktonic cells to NTP is similar to that of other species. Treatment of suspension cells was described in Gabriel et al (2016) , where a 5 log decrease was observed after 25 min of exposure. The efficiency of decontamination of agar plates was studied in several papers ( Justan et al, 2014 ; Metelmann et al, 2018 ; Gorbunova, 2019 ; Lee et al, 2019 ), where inhibition zones were observed from several seconds to 10 min of exposure depending on the NTP source and arrangement.…”

Section: Non-thermal Plasma Treatment Of Eskape Pathogensmentioning

confidence: 99%

“…However, it was considered as insufficient for the prevention of P. aeruginosa colonization of PVC endotracheal intubation devices. Gabriel et al (2016) applied a cocktail of four P. aeruginosa strains on the surface of stainless steel 316 and 304 for cell attachment. NTP was used for the early stage biofilm treatment for 90 s, with a 99.9% reduction in the cell population (a decrease of 5 log CFU/ml was achieved).…”

Section: Non-thermal Plasma Treatment Of Eskape Pathogensmentioning

confidence: 99%

Non-thermal Plasma Treatment of ESKAPE Pathogens: A Review

et al. 2021

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The acronym ESKAPE refers to a group of bacteria consisting of Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter spp. They are important in human medicine as pathogens that show increasing resistance to commonly used antibiotics; thus, the search for new effective bactericidal agents is still topical. One of the possible alternatives is the use of non-thermal plasma (NTP), a partially ionized gas with the energy stored particularly in the free electrons, which has antimicrobial and anti-biofilm effects. Its mechanism of action includes the formation of pores in the bacterial membranes; therefore, resistance toward it is not developed. This paper focuses on the current overview of literature describing the use of NTP as a new promising tool against ESKAPE bacteria, both in planktonic and biofilm forms. Thus, it points to the fact that NTP treatment can be used for the decontamination of different types of liquids, medical materials, and devices or even surfaces used in various industries. In summary, the use of diverse experimental setups leads to very different efficiencies in inactivation. However, Gram-positive bacteria appear less susceptible compared to Gram-negative ones, in general.

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Reference organism selection for microwave atmospheric pressure plasma jet treatment of young coconut liquid endosperm

Cited by 29 publications

References 39 publications

A Review on Non-thermal Atmospheric Plasma for Food Preservation: Mode of Action, Determinants of Effectiveness, and Applications

A Review on Non-thermal Atmospheric Plasma for Food Preservation: Mode of Action, Determinants of Effectiveness, and Applications

Effect of Non-Thermal Atmospheric Plasma on Food-Borne Bacterial Pathogens on Ready-to Eat Foods: Morphological and Physico-Chemical Changes Occurring on the Cellular Envelopes

Non-thermal Plasma Treatment of ESKAPE Pathogens: A Review

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