Improved process for reducing levels of microorganisms in...

A - Human Necessities – 23 – L

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A23L 2/50 (2006.01) A23B 5/005 (2006.01) A23B 5/015 (2006.01) A23C 3/00 (2006.01) A23C 3/033 (2006.01) A23L 2/46 (2006.01) A23L 3/005 (2006.01) A23L 3/18 (2006.01) A23L 3/22 (2006.01) A23L 3/32 (2006.01) C02F 1/48 (2006.01)

Patent

CA 2223509

The present invention is directed to methods and apparatuses for preserving fluid foodstuffs. More particularly, it is directed to methods and apparatuses for extending the shelf life of perishable fluid foodstuffs such as dairy products, fruit juices and liquid egg products, which contain significant levels of microorganisms. The improved methods and apparatuses incorporate a plurality of electric field treatment zones (106) with cooling units (108) between each pair of treatment zones in order to maintain the temperature of the pumpable foodstuff at a level at which microorganisms are killed in sufficient numbers and at which changes in the flavor, appearance, odor, or functionality of the foodstuff remain within acceptable ranges. For a comparable microorganism kill, foodstuffs prepared by the present process have significantly higher quality than foodstuffs prepared with standard thermal processes (e.g., ultra-high temperature pasteurization).

La présente invention concerne des procédés et des appareils de conservation de produits alimentaires fluides. Plus particulièrement, elle concerne des procédés et des appareils pour prolonger la durée de conservation de produits alimentaires périssables tels que les produits laitiers, les jus de fruit et les produits à base d'oeufs liquides, qui contiennent des concentrations importantes de micro-organismes. Les procédés et appareils améliorés comprennent une pluralité de zones de traitement (106) à champs électriques avec des unités de refroidissement (108) entre chaque paire de zones de traitement, afin de maintenir la température du produit alimentaire pouvant être pompé à une valeur à laquelle les micro-organismes sont tués en nombres suffisants et à laquelle les changements d'arôme, d'aspect, d'odeur ou de fonctionnalité des aliments se situent dans des plages acceptables. Les aliments préparés selon ce procédé présentent une qualité notablement supérieure par rapport aux aliments préparés selon des procédés thermiques standards (par ex. pasteurisation à ultra-haute température), et permettent de tuer les micro-organismes de manière toute aussi efficace.

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