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Guillén S, Cebrián G. Relationship between iron bioavailability and Salmonella Typhimurium fitness in raw and pasteurized liquid whole egg. Food Microbiol 2022; 104:104008. [DOI: 10.1016/j.fm.2022.104008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 02/16/2022] [Accepted: 02/21/2022] [Indexed: 11/27/2022]
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Freire V, Lattanzio G, Orera I, Mañas P, Cebrián G. Component release after exposure of Staphylococcus aureus cells to pulsed electric fields. INNOV FOOD SCI EMERG 2021. [DOI: 10.1016/j.ifset.2021.102838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Martínez JM, Delso C, Angulo J, Álvarez I, Raso J. Pulsed electric field-assisted extraction of carotenoids from fresh biomass of Rhodotorula glutinis. INNOV FOOD SCI EMERG 2018. [DOI: 10.1016/j.ifset.2018.04.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Fernández A, Cebrián G, Álvarez-Ordóñez A, Prieto M, Bernardo A, López M. Influence of acid and low-temperature adaptation on pulsed electric fields resistance of Enterococcus faecium in media of different pH. INNOV FOOD SCI EMERG 2018. [DOI: 10.1016/j.ifset.2017.12.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
The influence of temperature (7-43 °C), pH (3.5-7.0) and ethanol concentration (6-25%) on PEFinduced autolysis and the release of mannose from Saccharomyces cerevisiae was investigated. Changes in the release of intracellular compounds absorbing at 260 nm and 280 nm depended on storage conditions and differed among untreated and PEF-treated cells. For untreated cells, the increase of the Abs260 and Abs280 values during 3 weeks of storage was very low when incubated in media of different pH, different ethanol concentrations, or at 7° and 25 °C. Conversely, Abs260 and Abs280 values progressively increased for PEF-treated cells stored under the same conditions. Although the PEF treatment intensity was the same in all cases, the amount of intracellular material released depended on incubation conditions. Except for cells stored at 43 °C, for which the concentration of mannose in the media after 21 days was around 90 mg L-1, the amount of mannose released from untreated cells after 21 days of storage was lower than 60 mg L-1 under all other conditions assayed. After the same incubation time, the amount of mannose released from PEF treated cells ranged from 80 mg L-1, when they were stored in media with 25% ethanol, to 190 mg L-1 when they were stored at 43 °C. Interaction among assayed factors affecting mannose release was investigated in a medium containing 10% ethanol (v/v) and pH 3.5 for 21 days. Although the interaction of both factors delayed mannose release, the medium containing PEF-treated yeasts had approximately twice the amount of mannoproteins as those containing untreated yeasts.
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Novickij V, Lastauskienė E, Švedienė J, Grainys A, Staigvila G, Paškevičius A, Girkontaitė I, Zinkevičienė A, Markovskaja S, Novickij J. Membrane Permeabilization of Pathogenic Yeast in Alternating Sub-microsecond Electromagnetic Fields in Combination with Conventional Electroporation. J Membr Biol 2017; 251:189-195. [PMID: 28238117 DOI: 10.1007/s00232-017-9951-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 02/15/2017] [Indexed: 12/14/2022]
Abstract
Recently, a novel contactless treatment method based on high-power pulsed electromagnetic fields (PEMF) was proposed, which results in cell membrane permeabilization effects similar to electroporation. In this work, a new PEMF generator based on multi-stage Marx circuit topology, which is capable of delivering 3.3 T, 0.19 kV/cm sub-microsecond pulses was used to permeabilize pathogenic yeast Candida albicans separately and in combination with conventional square wave electroporation (8-17 kV/cm, 100 μs). Bursts of 10, 25, and 50 PEMF pulses were used. The yeast permeabilization rate was evaluated using flow cytometric analysis and propidium iodide (PI) assay. A statistically significant (P < 0.05) combinatorial effect of electroporation and PEMF treatment was detected. Also the PEMF treatment (3.3 T, 50 pulses) resulted in up to 21% loss of yeast viability, and a dose-dependent additive effect with pulsed electric field was observed. As expected, increase of the dB/dt and subsequently the induced electric field amplitude resulted in a detectable effect solely by PEMF, which was not achievable before for yeasts in vitro.
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Affiliation(s)
- Vitalij Novickij
- Institute of High Magnetic Fields, Vilnius Gediminas Technical University, Naugarduko st. 41, 03227, Vilnius, Lithuania.
| | - Eglė Lastauskienė
- Department of Microbiology and Biotechnology, Vilnius University, Sauletekio al. 7, 10257, Vilnius, Lithuania
| | - Jurgita Švedienė
- Laboratory of Biodeterioration Research, Nature Research Centre, Akademijos st. 2, 08412, Vilnius, Lithuania
| | - Audrius Grainys
- Institute of High Magnetic Fields, Vilnius Gediminas Technical University, Naugarduko st. 41, 03227, Vilnius, Lithuania
| | - Gediminas Staigvila
- Institute of High Magnetic Fields, Vilnius Gediminas Technical University, Naugarduko st. 41, 03227, Vilnius, Lithuania
| | - Algimantas Paškevičius
- Laboratory of Biodeterioration Research, Nature Research Centre, Akademijos st. 2, 08412, Vilnius, Lithuania
| | - Irutė Girkontaitė
- Department of Immunology, State Research Institute Centre for Innovative Medicine, Santariškių st. 5, 08406, Vilnius, Lithuania
| | - Auksė Zinkevičienė
- Department of Immunology, State Research Institute Centre for Innovative Medicine, Santariškių st. 5, 08406, Vilnius, Lithuania
| | - Svetlana Markovskaja
- Laboratory of Mycology, Nature Research Centre, Žaliųjų ežerų st. 49, 08406, Vilnius, Lithuania
| | - Jurij Novickij
- Institute of High Magnetic Fields, Vilnius Gediminas Technical University, Naugarduko st. 41, 03227, Vilnius, Lithuania
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Cebrián G, Condón S, Mañas P. Influence of growth and treatment temperature on Staphylococcus aureus resistance to pulsed electric fields: Relationship with membrane fluidity. INNOV FOOD SCI EMERG 2016. [DOI: 10.1016/j.ifset.2016.08.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Martínez JM, Cebrián G, Álvarez I, Raso J. Release of Mannoproteins during Saccharomyces cerevisiae Autolysis Induced by Pulsed Electric Field. Front Microbiol 2016; 7:1435. [PMID: 27672386 PMCID: PMC5019107 DOI: 10.3389/fmicb.2016.01435] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 08/30/2016] [Indexed: 11/13/2022] Open
Abstract
The potential of the application of pulsed electric fields (PEF) to induce accelerate autolysis of a commercial strain of Saccharomyces cerevisiae for winemaking use was evaluated. The influence of PEF treatments of different intensity (5–25 kV/cm for 30–240 μs) on cell viability, cytoplasmic membrane permeabilization and release of mannoproteins and compounds absorbing at 260 and 280 nm has been investigated. After 8 days of incubation at 25°C the Abs600 of the suspension containing the control cells was kept constant while the Abs600 of the suspension containing the cells treated by PEF decreased. The measurement of the absorbance at 260 and 280 nm revealed no release of UV absorbing material from untreated cells after 8 days of incubation but the amount of UV absorbing material released drastically increased in the samples that contained cells treated by PEF after the same storage period. After 18 days of storage the amount of mannoproteins released from the untreated cell was negligible. Conversely, mannoprotein concentration increased linearly for the samples containing cells of S. cerevisiae treated by PEF. After 18 days of incubation the concentration of mannoproteins in the supernatant increased 4.2 times for the samples containing cells treated by PEF at 15 and 25 kV/cm for 45 and 150 μs. Results obtained in this study indicates that PEF could be used in winemaking to accelerate the sur lie aging or to obtain mannoproteins from yeast cultures.
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Affiliation(s)
- Juan M Martínez
- Tecnología de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón, Universidad de Zaragoza Zaragoza, Spain
| | - Guillermo Cebrián
- Tecnología de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón, Universidad de Zaragoza Zaragoza, Spain
| | - Ignacio Álvarez
- Tecnología de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón, Universidad de Zaragoza Zaragoza, Spain
| | - Javier Raso
- Tecnología de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón, Universidad de Zaragoza Zaragoza, Spain
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