Decontamination of surfaces contaminated with prion-infected...

C - Chemistry – Metallurgy – 11 – D

Patent

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C11D 3/39 (2006.01) A61K 31/327 (2006.01) A61L 2/00 (2006.01) A61L 2/14 (2006.01) A61L 2/16 (2006.01) A61L 2/18 (2006.01) A61L 2/20 (2006.01) C11D 11/00 (2006.01)

Patent

CA 2462746

A surface which carries a material which is infected with prions is cleaned with an alkaline cleaning solution to remove as much proteinaceous material as possible from the surface. The cleaning agent is an alkaline cleaning agent which attacks prions remaining on the surface and which attacks prions removed from the surface during the cleaning step. After the cleaning solution is drained, a solution of surfactants, buffers, and heavy metal free corrosion inhibitors is circulated over the surface at 50~-60OC. The surfactants disperse and unclump the prion-contaminated material. A strong oxidant, preferably peracetic acid, is added to the . solution to bring the peracetic acid concentration to 1,000-2,500 ppm. The peracetic acid or other strong oxidant attacks the prions, particularly the unclumped prion strands, deactivating the prions. After rinsing and drying, the surface may be wrapped in a microbe impermeable barrier and subjected to terminal sterilization, such as steam autoclaving.

Selon l'invention, une surface comportant un matériau infecté par les prions peut être nettoyée au moyen d'une solution de nettoyage alcaline, de sorte à éliminer autant de matériau protéinique que possible de cette surface. Cet agent de nettoyage est un agent de nettoyage alcalin qui attaque les prions se trouvant sur la surface, ainsi que les prions retirés de cette surface pendant l'étape de nettoyage. Après drainage de ladite solution de nettoyage, une solution de tensioactifs, de tampons et d'inhibiteurs de corrosion exempts de métaux lourds est acheminée sur la surface, à une température comprise entre 50 et 60 ·C. Les tensioactifs dispersent et séparent le matériau contaminé par les prions. Un oxydant fort, de préférence de l'acide péracétique, est ajouté à la solution pour amener la concentration d'acide péracétique entre 1000 et 2500 ppm. L'acide péracétique ou un autre oxydant fort attaque les prions, en particulier les souches de prions séparées, ce qui désactive les prions. Après rinçage et séchage, la surface peut être enveloppée dans une barrière imperméable aux microbes et soumise à une stérilisation finale, telle qu'une stérilisation en autoclave à la vapeur.

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