Search results for "séchage"

Les traitements de pasteurisation et de séchage de l'oeuf entier ainsi que l'étuvage à sec du blanc d'oeuf modifient le coefficient d'efficacité prot…

2009

Selection and integration of a new immunomodulatory probiotic strain in a food supplement

2012

Probiotics are live microorganisms that can act on the immune system at specific sites in the gastro-intestinal tract. From a technological point of view, the development of a dietary supplement containing viable and functional probiotics requires the control of the selection and production steps. In a first time, we have developed specific and sensitive screening tests to determine the ability of bacteria to be dried and the origin of its sensitivity. To develop these tests, we investigated the mechanisms involved during drying process. Thus, microorganisms simultaneously undergo osmotic stress and oxidative stress. Results show a strong impact of drying on the survival rate and immunomodu…

Cellular Injuries in Cronobacter sakazakii CIP 103183T and Salmonella enterica Exposed to Drying and Subsequent Heat Treatment in Milk Powder

2018

International audience; Because of the ability of foodborne pathogens to survive in low-moisture foods, their decontamination is an important issue in food protection. This study aimed to clarify some of the cellular mechanisms involved in inactivation of foodborne pathogens after drying and subsequent heating. Individual strains of Salmonella Typhimurium, Salmonella Senftenberg, and Cronobacter sakazakii were mixed into whole milk powder and dried to different water activity levels (0.25 and 0.58); the number of surviving cells was determined after drying and subsequent thermal treatments in closed vessels at 90 and 100 degrees C, for 30 and 120 s. For each condition, the percentage of unc…

Foodborne pathogens inactivation in low-water activity foods

2016

Dried food products are common in food industry. Nevertheless, their safety is not well insured, involving numerous outbreaks every years around the world. Particularly, two pathogenic bacteria are of interest, one of them due to its number of cases, Salmonella enterica, and the other one due to its ability to survive environmental perturbations, Cronobacter spp.. A deeper comprehension of drying and heat treatment in dried state impact could lead to an optimization of drying and heating processes, insuring food safety. In the first instance, drying was considered as a supplementary decontamination step by optimizing its conditions of use. In a second phase, the rehydration impact was studi…

Brunissage, polissage et degrés de séchage : un référentiel expérimental

2010

As a great many technical operations are involved in the creation of pottery, it is often difficult to discover precisely in what order they were used in the "chaînes opératoires". The determination of the state of drying is an essential step in rediscovering the archaeological chaîne opératoire. An experimental method is developed to identify burnishing and polishing techniques. The states of drying can be identified by the study of experimental trace types and surface aspects. Precise differenciation on archaeological sherds between burnishing and polishing techniques then becomes possible. The development of this method for other techniques will undoubtedly increase the quality and preci…