Improved deactivation of organisms using high-intensity...

Details Improved deactivation of organisms using high-intensity... Improved deactivation of organisms using high-intensity...

A - Human Necessities

61

L

A61L 2/08 (2006.01) A23L 3/26 (2006.01) B65B 55/04 (2006.01) C02F 1/30 (2006.01) C02F 1/32 (2006.01) C12N 7/04 (2006.01)

Patent

CA 2235244

A method of deactivating microorganisms in food products, packaging material, water, air, and other products involves illuminating the microorganisms using at least one short-duration, high-intensity pulse of broad-spectrum polychromatic light. In variations of this embodiment, the light has an intensity of at least 0.1 J/cm2, the pulse duration is from between about 10 nanoseconds and 10 milliseconds, and/or at least 50 % of the at least one pulse's energy is transmitted in light having wavelength from between about 170 and 2600 nanometers. Advantageously, the microorganisms may be Cryptosporidium parvum oocysts, Bacillus pumilus spores or poliovirus.

L'invention concerne un procédé pour désactiver des micro-organismes dans des produits alimentaires, des matériaux d'emballage, l'eau, l'air et divers produits, en projetant sur les micro-organismes au moins une impulsion de lumière polychromatique (c'est-à-dire à spectre large), de courte durée et de haute intensité. Dans une variante de cette invention, l'intensité de la lumière est d'au moins 0,1 J/cm<2> et la durée de l'impulsion se situe entre 10 nanosecondes et 10 millisecondes environ, et/ou au moins 50 % de l'énergie de l'impulsion est transmise dans une lumière présentant une plage de longueurs d'onde allant de 170 à 2600 nm environ. En particulier, les micro-organismes peuvent être des oocystes de Cryptosporidium parvum, des spores de Bacillus pumilus ou des poliovirus.

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