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Combined methods for preservation of fruits and vegetables: a presevation concept
Why combined method
Food preserved by combined method ( hurdles ) remain stable and sate even without refrigeration, and is high in sensory and nutritive valie due to the gentle process applied. Hurdle technology is the term often applied whenfoods are preserved by a combination of process. The hurdle inclues temperature, water activity, redox potentail, modified atmostphere, preservation, etc. The concept is that for a given food the bacteria should not be able to " jump over " all of the hurdles present, and so should be inhibited. If several hurdles are used simultaneously, preservation could be applied, which nevertheless secures stable and safe foods of high sensory and nutritional properties. This is because different hurdles in a food often have a synergistic ( enhancing ) or additive effect. For instance, modifiled foods may be designed to require no refrigeration and thus save energy. On the other hand, preservation ( e.g., nitrite in meats ) could be partailly replaced br certain hurdles , ( such as water activity ) jn a food. Moreover, a hurdles could be used without affecting the integrity of food pieces ( e.g., fruits ) or in the application of high pressure for the preservation of other foods. Hurdles technology is applicable both in large and small food industries. In general, hurdle technology is now widely used for food design in making new products according to the needs of processors and consumers. For instance, if enegy preservation is the goal, then energy consumption hordles such as refrigeration can be replaced by hurdles that do not require enegy and still ensure a stable and safe product.
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