PProvided 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.
PHOTOINDUCED SIGNAL AMPLIFICATION THROUGH EXTERNALLY SENSITIZED PHOTOFRAGMENTATION IN MASKED PHOTOSENSITIZERS AND PHOTOAMPLIFIED FLUORESCENCE TURN-OFF SYSTEM