Fluorescent pH detector system and related methods
First Claim
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1. A method for measuring the pH of a sample, comprising:
- (a) irradiating a fluorescent species in communication with a sample with excitation light having a wavelength sufficient to effect fluorescent emission from the fluorescent species,wherein the fluorescent species comprises a 2-halo seminaphthofluorescein and exhibits a first emission intensity at a first emission wavelength and a second emission intensity at a second emission wavelength, the ratio of the first and second emission intensities being dependent on pH; and
(b) measuring the first and second emission intensities to determined the pH of the sample.
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Abstract
Fluorescent pH detector and methods for measuring pH using the fluorescent pH detector.
92 Citations
23 Claims
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1. A method for measuring the pH of a sample, comprising:
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(a) irradiating a fluorescent species in communication with a sample with excitation light having a wavelength sufficient to effect fluorescent emission from the fluorescent species, wherein the fluorescent species comprises a 2-halo seminaphthofluorescein and exhibits a first emission intensity at a first emission wavelength and a second emission intensity at a second emission wavelength, the ratio of the first and second emission intensities being dependent on pH; and (b) measuring the first and second emission intensities to determined the pH of the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for measuring pH, comprising:
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(a) a light source for exciting a fluorescent species, wherein the fluorescent species comprises a 2-halo seminaphthofluorescein and has a first emission intensity at a first emission wavelength and a second emission intensity at a second emission wavelength; (b) a first emission detector for measuring the first emission intensity; (c) a second emission detector for measuring the second emission intensity; (d) an excitation lightguide for transmitting excitation light from the light source to the fluorescent species, wherein the lightguide comprises a first terminus proximate to the light source and a second terminus distal to the light source; (e) a first emission lightguide for transmitting emission from the fluorescent species to the first emission detector, wherein the lightguide comprises a first terminus proximate to the detector and a second terminus distal to the detector; (f) a second emission lightguide for transmitting emission from the fluorescent species to the second emission detector, wherein the lightguide comprises a first terminus proximate to the detector and a second terminus distal to the detector; (g) a probe housing the distal termini of the excitation lightguide, first emission lightguide, and second emission light guide; and (h) an assembly for receiving the probe, the assembly comprising; (i) a housing for receiving the probe, wherein the housing is adapted for receiving the probe at a first end and terminating with a window at the second end, the window being transparent to the excitation and the emission light, (ii) a tip member reversibly connectable to the housing'"'"'s second end, wherein the tip member is adapted to receive liquid from a sample to be measured, and (iii) a fluorescent species immobilized on a substrate intermediate the tip member and the window, wherein the fluorescent species immobilized on the substrate is in liquid communication with the sample during the measurement. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification