PHOTOINDUCED SIGNAL AMPLIFICATION THROUGH EXTERNALLY SENSITIZED PHOTOFRAGMENTATION IN MASKED PHOTOSENSITIZERS AND PHOTOAMPLIFIED FLUORESCENCE TURN-OFF SYSTEM
First Claim
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1. A method of amplified fluorescence quenching comprising:
- (a) providing a plurality of masked photosensitizers, each masked photosensitizer having a masking group bonded to a quenching photosensitizer through a releasable covalent bond which disrupts the conjugation of the quenching photosensitizer;
(b) providing a fluorophor in quenching proximity to a first masked photosensitizer;
(c) exciting the unmasked photosensitizer with photoradiation, whereby this excited sensitizer induces fragmentation in masked sensitizer, inducing release of the masking group from the first masked photosensitizer, producing a quenching photosensitizer which (1) reduces the fluorescence of the fluorophor and (2) induces the release of the masking group from a second masked photosensitizer; and
(d) repeating step (c).
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Abstract
Provided is a photoamplified fluorescence turn-off assay where a masked photosensitizer is mixed with a fluorescent molecule. This mixture is brightly fluorescent because the masked photosensitizer is not capable of quenching the fluorophore. When the photosensitizer is released and amplified, the photosensitizer quenches the emission of fluorophores very efficiently.
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21 Claims
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1. A method of amplified fluorescence quenching comprising:
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(a) providing a plurality of masked photosensitizers, each masked photosensitizer having a masking group bonded to a quenching photosensitizer through a releasable covalent bond which disrupts the conjugation of the quenching photosensitizer; (b) providing a fluorophor in quenching proximity to a first masked photosensitizer; (c) exciting the unmasked photosensitizer with photoradiation, whereby this excited sensitizer induces fragmentation in masked sensitizer, inducing release of the masking group from the first masked photosensitizer, producing a quenching photosensitizer which (1) reduces the fluorescence of the fluorophor and (2) induces the release of the masking group from a second masked photosensitizer; and (d) repeating step (c). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An array of pixels comprising:
a plurality of spatially separated groups of masked photosensitizers in a gelated solvent, each group comprising a plurality of masked photosensitizers, each masked photosensitizer having a masking group bonded to a photosensitizer through a releasable covalent bond which disrupts the conjugation of the photosensitizer, said masked photosensitizers in each group in releasing proximity with each other. - View Dependent Claims (20, 21)
Specification