Photodynamic activity of sapphyrins
First Claim
1. A method of producing singlet oxygen, comprising:
- dissolving a diprotonated sapphyrin conjugate diacid in a solvent;
exciting said diprotonated sapphyrin conjugate diacid at an absorbing wavelength to form a triplet species; and
generating singlet oxygen by reacting molecular oxygen with said triplet species.
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Abstract
The present invention includes a method to produce singlet oxygen from molecular oxygen generated by reaction with a sapphyrin compound excited at an absorbing wavelength to form a triplet species. Specifically, the sapphyrin compound is an alkylated sapphyrin, most preferably diprotonated 3,8,12,13,17,22-hexaethyl-2,7,18,23-tetramethylsapphyrin. Generation of the triplet species may be accomplished in an organic solvent, of which the most preferable solvents are chloroform, methanol or acetonitrile.
Also encompassed within the present invention is a method to selectively produce singlet oxygen in an aqueous environment. A sapphyrin compound is incorporated within a membranous vesicle, the vesicle is illuminated with exciting light and the resultant excited triplet state sapphyrin compound reacts with molecular oxygen to produce singlet oxygen. Singlet oxygen was not generated external to the vesicle where the sapphyrin compound is present in an aqueous medium.
24 Citations
18 Claims
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1. A method of producing singlet oxygen, comprising:
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dissolving a diprotonated sapphyrin conjugate diacid in a solvent; exciting said diprotonated sapphyrin conjugate diacid at an absorbing wavelength to form a triplet species; and generating singlet oxygen by reacting molecular oxygen with said triplet species. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of selective production of singlet oxygen, comprising:
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incorporating a diprotonated sapphyrin conjugate diacid into a suitable biological carrier in an aqueous environment; illuminating said aqueous environment at a wavelength effective to excite said diprotonated sapphyrin conjugate diacid to triplet state species; generating singlet oxygen by allowing molecular oxygen dissolved in said environment to react with said triplet state species; and terminating said singlet oxygen generation by cessation of said illumination. - View Dependent Claims (11, 12)
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13. A method of modulating production of singlet oxygen in organic solvents, comprising:
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dissolving a diprotonated sapphyrin conjugate diacid in an organic solvent to form a solution; introducing molecular oxygen into said solution; illuminating said solution sufficiently to cause excitation of said diprotonated sapphyrin conjugate diacid to excited triplet species; and adding at least one moderator to said solution, said moderator comprising ampholytic biologically compatible materials to which said sapphyrin compound will bind. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification