High temperature/ultra-high pressure sterilization of low...

A - Human Necessities – 23 – L

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A23L 3/015 (2006.01) A23B 4/005 (2006.01) A23B 7/005 (2006.01) A23L 3/10 (2006.01)

Patent

CA 2239291

Method for sterilizing low acid foods using both ultra-high pressures and high temperatures. The instantaneous temperature change that occurs when pressure is applied combines a high-temperature short-time process with ultra-high pressure to deliver a fast and therefore gentle thermal process to a pre-packaged product. The process involves heating a low acid food to a pre-pressurized temperature, subjecting the food to ultra-high pressure, which instantaneously raises the temperature of the food, and then releasing the pressure so that the temperature returns to the original pre-pressurized temperature. The method leverages the adiabatic temperature rise which occurs when the food is hydrostatically pressurized, coupled with the lethality of the pressure, to achieve appropriate sterilization conditions. The disclosure also includes low acid foods which have been sterilized using both ultra-high pressures and high temperatures.

Procédé de stérilisation d'aliments hypoacides utilisant à la fois des pressions ultra-hautes et des températures élevées. Le changement de température instantané, se produisant lorsqu'une pression est appliquée, allie un traitement très court à température élevée à une pression ultra-haute afin de soumettre un produit préconditionné à un traitement thermique rapide et par conséquent léger. Le traitement consiste à chauffer un aliment hypoacide à une température de prépressurisation, à soumettre l'aliment à une pression ultra-haute, laquelle élève instantanément la température de l'aliment, et ensuite à libérer la pression de sorte que la température revienne à la température de prépressurisation de départ. Le procédé exerce un effet amplificateur sur la montée de température adiabatique se produisant lorsque l'aliment est sous pression hydrostatique, associé à la létalité de la pression, afin d'obtenir des conditions de stérilisation appropriées. L'invention comprend également des aliments hypoacides ayant été stérilisés à l'aide à la fois des pressions ultra-hautes et des températures élevées.

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