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Bacterial inactivation using pulsed light ArchiMer
Elmnasser, Noura; Ritz, Magali; Leroi, Francoise; Orange, Nicole; Bakhrouf, Amina; Federighi, Michel.
Pulsed light is a new method intended for the decontamination of food surfaces using short, high frequency pulses of an intense broad spectrum. The effects of broad spectrum pulsed light on the survival of Listeria monocytogenes Scott A, Listeria monocytogenes CNL, Pseudomonas fluorescens MF37 and Photobacterium phosphoreum SF680 populations on agar and in a liquid medium were investigated during this study. The sterilisation system generated 1.5 J cm(-2) per pulse with eight lamps for 300 mu s. In the case of surface-seeded cells, a 7.8, 8.14 and > 7.14 log reduction was obtained for L. monocytogenes, Ps. fluorescens MF37 and Ph. phosphoreum, respectively, after a single pulse of treatment. Inactivation levels were lower for depth-plated cells: indeed,...
Tipo: Text Palavras-chave: Efficiency; Inactivation; Bacteria; Treatment; Pulsed light.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3041.pdf
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Effect of inactivation and reactivation conditions on activity recovery of enzyme catalysts Electron. J. Biotechnol.
Wilson,Lorena; Illanes,Andrés; Romero,Oscar.
Enzymes are labile catalysts with reduced half-life time that can be however improved by immobilization and, furthermore, already inactivated catalyst can be recovered totally or partially, therefore allowing the large scale application of enzymes as process catalysts. In recent years a few studies about reactivation of enzyme catalysts have been published as a strategy to prolong the catalyst lifetime. Reported results are very good, making this strategy an interesting tool to be applied to industrial process. These studies have been focused in the evaluation of different variables that may have a positive impact both in the rate and level of activity recovery, being then critical variables for conducting the reactivation process at productive scale. The...
Tipo: Journal article Palavras-chave: CLEAs; Enzyme immobilization; Enzyme reactivation; Glyoxyl agarose; Inactivation; Organic cosolvents; Unfolding - refolding.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300015
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Modeling the pressure inactivation dynamics of Escherichia coli BJMBR
Yamamoto,K.; Matsubara,M.; Kawasaki,S.; Bari,M.L.; Kawamoto,S..
Escherichia coli, as a model microorganism, was treated in phosphate-buffered saline under high hydrostatic pressure between 100 and 300 MPa, and the inactivation dynamics was investigated from the viewpoint of predictive microbiology. Inactivation data were curve fitted by typical predictive models: logistic, Gompertz and Weibull functions. Weibull function described the inactivation curve the best. Two parameters of Weibull function were calculated for each holding pressure and their dependence on holding pressure was obtained by interpolation. With the interpolated parameters, inactivation curves were simulated and compared with the experimental data sets.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Predictive microbiology; Pressure; Escherichia coli; Inactivation; Model.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000800014
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Partial characterization and inactivation of peroxidases and polyphenol-oxidases of umbu-cajá (Spondias spp.) Ciênc. Tecnol. Aliment.
Silva,Cíntia Reis da; Koblitz,Maria Gabriela Bello.
A crude extract of Spondias spp. was evaluated for the influence of pH and temperature on the activity and stability of its peroxidases and polyphenol-oxidases. In order to evaluate the conditions for the inactivation of the enzymes by heat treatment and by addition of a reducing agent, a factorial experimental design (n = 3) was employed using the Statistica (6.0) software package for data analysis. The optimal conditions found for peroxidases were: pH = 5.0 and temperature = 40 ºC, and for polyphenol-oxidases they were pH = 7.0 and temperature = 40 ºC. The peroxidases and polyphenol-oxidases were stable at all pH values tested (3.0 - 10.0) and maintained more than 60% of their activity at temperatures above 30 and 40 ºC, respectively. To achieve the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Peroxidase; Polyphenol-oxidase; Spondias spp.; Inactivation.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612010000300035
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Peroxidase activity in roots of arracacha affected by pH and temperature - doi: 10.4025/actasciagron.v33i3.6264 Agronomy
Menolli, Luciana Nunes; UFV; Finger, Fernando Luiz; UFV; Barbosa, Janaína Miranda; UFV; Correia, Teresa Drummond; UFV; Vieira, Luciana Marques; UFV.
In this paper, roots of arracacha (Arracacia xanthorrhyza Bancroft) were stored at 5ºC to induce chilling injury symptoms and stress-related peroxidase activity. Later, peroxidase kinetic activity was determined in different pH and temperature conditions. For this, soluble crude extract was sequentially saturated with ammonium sulfate, obtaining a semi-purified enzyme solution used for the analysis. Activity of peroxidase induced by the chilling at 5oC was determined from pH 2.5 to 9.0 and at temperature ranging from 10 to 80oC. The peroxidase had higher activity when the reaction occurred between pH 5.5 and 6.0 and at temperature of 30oC. Complete inactivation of the activity was observed in pH 2.5 after 60 minutes of pre-incubation or at 60oC for 10...
Palavras-chave: 5.01.00.00-9 Arracacia xanthorrhyza Bancroft; Oxidative enzyme; Inactivation 5.07.01.04-5 Arracacia xanthorrhyza Bancroft; Oxidative enzyme; Inactivation.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6264
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Some physico-chemical parameters that influence proteinase K resistance and the infectivity of PrP Sc after high pressure treatment BJMBR
Heindl,P.; Fernández García,A.; Büttner,M.; Voigt,H.; Butz,P.; Tauscher,B.; Pfaff,E..
Crude brain homogenates of terminally diseased hamsters infected with the 263 K strain of scrapie (PrP Sc) were heated and/or pressurized at 800 MPa at 60ºC for different times (a few seconds or 5, 30, 120 min) in phosphate-buffered saline (PBS) of different pH and concentration. Prion proteins were analyzed on immunoblots for their proteinase K (PK) resistance, and in hamster bioassays for their infectivity. Samples pressurized under initially neutral conditions and containing native PrP Sc were negative on immunoblots after PK treatment, and a 6-7 log reduction of infectious units per gram was found when the samples were pressurized in PBS of pH 7.4 for 2 h. A pressure-induced change in the protein conformation of native PrP Sc may lead to less PK...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Native prion protein; Pressure; Inactivation; PH; Proteinase K sensitivity; Prion conformation.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000800010
Registros recuperados: 6
Primeira ... 1 ... Última
 

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