Photodynamic porphyrin antimicrobial agents

A - Human Necessities – 61 – K

Patent

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Details

A61K 31/409 (2006.01) A61K 31/4439 (2006.01) A61K 41/00 (2006.01) C07D 487/22 (2006.01)

Patent

CA 2459928

A series of novel positively-charged porphyrins is disclosed which exhibit a markedly increased efficiency in photosensitizing both Gram-positive and Gram- negative bacteria to the action of visible light, causing death to such bacteria when present at much lower concentrations and much shorter irradiation times than those porphyrins taught in the prior art. These porphyrins are characterized by the presence of up to four positive charges in the peripheral substituents and at least one hydrophobic tail comprising between 6 and 22 carbons inclusive, originating at one or more of the charged sites.

La présente invention concerne une série de porphyrines à charge positive qui font preuve d'une efficacité notoirement accrue pour la photosensibilisation des bactéries Gram-positives et Gram-négatives par l'action de la lumière visible, causant ainsi la mort de telles bactéries, malgré une présence de ces porphyrines sous des concentrations bien plus faibles et pendant des durées d'illumination bien plus courtes qu'avec les porphyrines selon l'état de la technique. Ces porphyrines sont caractérisées par la présence d'un maximum de quatre charges positives dans les substituants périphérique et au moins une queue hydrophobe en C¿6?-C¿22? prenant naissance à l'un au moins des sites chargés.

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