Photodynamic porphyrin antimicrobial agents
First Claim
Patent Images
1. A photodynamic antimicrobial agent comprising:
- a porphyrin having four quaternized nitrogens, wherein the porphyrin further comprises a hydrocarbon tail beginning at one of the quaternized nitrogens.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
-
Citations
61 Claims
-
1. A photodynamic antimicrobial agent comprising:
a porphyrin having four quaternized nitrogens, wherein the porphyrin further comprises a hydrocarbon tail beginning at one of the quaternized nitrogens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- 16. A photodynamic antimicrobial agent comprising a meso-tetra-(N-methyl-pyridyl) porphyrin having four quaternized nitrogens, and wherein one N-methyl group has been replaced by a hydrocarbon tail.
-
31. A method of synthesizing porphyrins with four symmetrically distributed positive charges on four quaternized nitrogens and a single hydrophobic hydrocarbon tail comprising the steps of:
-
quaternizing a first nitrogen of a porphyrin by reacting it with a sub-stoichiometric quantity of a halide salt of the desired hydrophobic hydrocarbon tail to form a mono-quaternized porphyrin; and
quaternizing the remaining nitrogens of the porphyrin using a methylating agent to form a porphyrin with four symmetrically distributed positive charges on four quaternized nitrogens and a single hydrophobic tail. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
-
-
44. A method of killing Gram-positive or Gram-negative bacteria comprising the steps of:
-
exposing Gram-positive or Gram-negative bacteria to a photodynamic antimicrobial agent comprising a porphyrin with four symmetrically-distributed positive charges and a hydrocarbon tail; and
irradiating the bacteria and antimicrobial agent. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
-
Specification