Oxidation reactions in milk conclude to negative consequences such as lipid oxidation, undesirable flavors, degradation of vitamins, and changes in microbial flora of milk. The objective of the study was to investigate the effect of electroreduction and storage conditions on an oil/water emulsion made of canola oil and reconstituted skim milk. The electroreduction treatments were carried out at two different anode/cathode voltage differences (0 and 4 V) on a 2% stable oil/water emulsion made of canola oil and skim milk. After each electroreduction treatment, samples of electroreduced emulsion were placed in conditions of storage in regards to headspace (0%, 10%, and 50%), temperature (4°C and 22°C) and in the dark for 14 days. The results showed that the electroreduction treatment significantly reduced the redox potential of the emulsion samples to negative values (from +85 to −412 mV) and was also able to decrease their dissolved oxygen (DO) concentration (from 3.8 to 2.5 mg.L −1 ). The storage conditions of headspace and temperature have had an important impact on the oxidation-reduction potential (ORP) value and the DO value. This study is the first to our knowledge to show that in storage conditions where the gaseous exchanges and especially the oxygen are limited, it is possible to maintain during 14 days a negative ORP in electroreduced oil-water emulsion.
La recherche concerne l'abbaye bénédictine de Jumièges, située en Haute-Normandie, dans la basse vallée de la Seine, entre Rouen et le Havre. Elle s 'attache avant tout à l'étude de ses bâtiments conventuels et à leur évolution du VIIe au XVIIIe siècle. Elle permet de voir comment les modifications des édifices du carré claustral, en rapport avec le contexte historique et les directives religieuses ont peu à peu transformé la topographie du site. Quatre phases chronologiques se détachent : l'installation (VIIe-IXe siècle), la renaissance de l'abbaye (XIe-XIIe siècle), l'extension (XIVe-XVe siècle), l'établissement des mauristes (XVIIe-XVIIIe siècle). En l'absence de fouilles approfondies, l'étude s'appuie essentiellement sur des sources historiques et une observation directe des vestiges encore en place, car, même si les pertes dues aux événements politiques et aux dégradations du temps sont importantes, des structures médiévales sont parvenues jusqu'à nous. C'est le cas de l'aile occidentale du cloître, siège d'un certain nombre de changements de fonction au cours des siècles qui a été plus particulièrement étudiée.
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