Search results for "Hautes Pressions"
showing 5 items of 5 documents
Behavior of plant plasma membranes under hydrostatic pressure as monitored by fluorescent environment-sensitive probes.
2010
International audience; We monitored the behavior of plasma membrane (PM) isolated from tobacco cells (BY-2) under hydrostatic pressures up to 3.5 kbar at 30 °C, by steady-state fluorescence spectroscopy using the newly introduced environment-sensitive probe F2N12S and also Laurdan and di-4-ANEPPDHQ. The consequences of sterol depletion by methyl-β-cyclodextrin were also studied. We found that application of hydrostatic pressure led to a marked decrease of hydration as probed by F2N12S and to an increase of the generalized polarization excitation (GPex) of Laurdan. We observed that the hydration effect of sterol depletion was maximal between 1 and 1.5 kbar but was much less important at hig…
Biopréservation et hautes pressions : des outils pour la maîtrise des dangers microbiologiques dans les aliments
2019
L’utilisation d’additifs conservateurs est souvent nécessaire pour assurer la sécurité microbiologique des produits carnés réfrigérés faiblement acides. Le projet ANR BLac HP (2014-2019) a étudié une nouvelle stratégie de stabilisation des produits carnés réfrigérés pour assurer le contrôle des flores indésirables à la fois végétatives et sporulées. Grâce à une approche pluridisciplinaire, les travaux ont montré que la combinaison de la biopréservation par des bactéries lactiques et d’un traitement hautes pressions permettait d’assurer la qualité microbiologique de dés de jambon cuits à teneur réduite en nitrite pendant toute leur durée de vie. Le traitement permet de plus une qualité senso…
Effects of high pressure processing and biopreservation on the inactivation and the germination of spores of Bacillus and Clostridium
2018
Bacterial endospores are one of the most resistant life form on earth. Their capacity to survive to decontamination processes and their potential pathogenicity represent a real problem for the food industry. Currently, the only way to prevent their development in foods is the application of thermal treatments or the use of preservatives. However, these two methods have negative impacts on the nutritional properties of foods and on the consumers’ health. High hydrostatic pressure (HP) is a non-thermal process widely used for commercial pasteurization of foods. However, this process has a very low effect on spores and has therefore to be combined with other decontamination processes to enhanc…
Understanding of the phenomena involved in the inactivation of bacterial spores by a process combining high pressure and heat treatment
2022
High Pressure Processing (HPP) is an established food processing technique for maintaining food quality while inactivating vegetative forms of pathogenic and spoilage bacteria. However, bacterial spores are very resistant to pressure, which requires the development of a strategy combining HPP with another modality (pressure cycling, heat treatment) to increase spore destruction. Currently, the combination of these processes are not implemented at an industrial scale due to the technically complex implementation and uncertain results given the diverse and contradictory literature on the level and mechanisms of spore inactivation by HP. The elucidation of spore inactivation mechanisms by pres…
Hautes Pressions : les Nouveaux Enjeux
2012
pour le champs 'auteurs', les Directeurs de publications apparaissent en premier puis le Directeur de collection.; International audience; P. 11|Introduction / Camille Loupiac, Alain Prat, Yann Le Godec|P. 15|Dernier inventaire avant cessation d’activité / H. Cardon|P. 31|La biologie sous pression : de la molécule au procédé / Roger Fourme, Gérard Hamel, Camille Loupiac, Jean-Marie Perrier-Cornet, Serge Pin, Julien Roche|P. 57|Synthèse de nouveaux matériaux à propriétés remarquables sous conditions extrêmes / Yann Le Godec et Pierre Toulemonde|P. 87|Physique sous haute pression: résultats récents et perspectives / Alain Polian|P. 107|Les déchets sous pression: un traitement ou une valorisat…