Two-photon and multi-photon measurement of analytes in animal and human tissues and fluids
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United States of America Patent
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Jun 2, 1998
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app pub date -
Oct 11, 1996
filing date -
Oct 11, 1996
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Abstract
A method of measuring an analyte present in animal (e.g., human) tissue or fluids such as blood or plasma. The analyte is multi-photon excitable (e.g., two-photon excitable) at a first wavelength at which the animal tissue is substantially non-absorbing. The analyte fluoresces at a second wavelength upon being excited at the first wavelength. The animal tissue is irradiated with radiation at the first wavelength so as to excite the analyte through absorption by the analyte of two or more photons of the radiation at the first wavelength. Excitation of the analyte results in a fluorescent emission from the analyte of radiation at the second wavelength. The emission at the second wavelength is detected, and the concentration of analyte determined based on the detected emission.
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