Method for quantitative determination of at least one chemical parameter of a sample medium
First Claim
1. A method for the quantitative determination of at least one chemical parameter of a sample medium, comprising the steps of:
- (a) providing a fluorescent substance with an excitation spectrum and an emission spectrum and which displays a fluorescent decay time (t), said fluorescent substance being non-responsive to said chemical parameter to be determined;
(b) providing a chromogenic substance having an absorption maximum which can be shifted in wavelength in accordance with said chemical parameter to be determined;
(c) immobilizing said fluorescent and chromogenic substances in close vicinity to each other on a substrate so that the emission spectrum of said fluorescent substance at least partially overlaps the absorption spectrum of said chromogenic substance, influencing the fluorescence decay time of said fluorescent substance;
(d) contacting said fluorescent and chromogenic substances with a sample medium defining at least one chemical parameter,(e) exposing said fluorescent substance to excitation radiation, and(f) measuring a reduction of said fluorescence decay time (t) caused by energy transfer between said chromogenic and said fluorescent substances for the quantitative determination of said chemical parameter.
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Abstract
A method for the quantitative determination of one or more chemical parameters of a sample medium employs a fluorescent agent which is not responsive to the parameter to be determined and which has an excitation spectrum and an emission spectrum, and a closely adjacent chromogenic agent which responds to the parameter of the sample medium to be determined by a change in its absorption spectrum the emission spectrum of the fluorescent agent at least partically overlapping the absorption spectrum of the chromogenic agent. The absorption maximum of chromogenic agent is shifted in accordance with the parameter to be determined, causing a reduction of fluorescence decay time t in the fluorescent agent, thereby enabling quantitative determination of the chemical parameter with improved long-term stability and infrequent calibrations.
19 Citations
11 Claims
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1. A method for the quantitative determination of at least one chemical parameter of a sample medium, comprising the steps of:
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(a) providing a fluorescent substance with an excitation spectrum and an emission spectrum and which displays a fluorescent decay time (t), said fluorescent substance being non-responsive to said chemical parameter to be determined; (b) providing a chromogenic substance having an absorption maximum which can be shifted in wavelength in accordance with said chemical parameter to be determined; (c) immobilizing said fluorescent and chromogenic substances in close vicinity to each other on a substrate so that the emission spectrum of said fluorescent substance at least partially overlaps the absorption spectrum of said chromogenic substance, influencing the fluorescence decay time of said fluorescent substance; (d) contacting said fluorescent and chromogenic substances with a sample medium defining at least one chemical parameter, (e) exposing said fluorescent substance to excitation radiation, and (f) measuring a reduction of said fluorescence decay time (t) caused by energy transfer between said chromogenic and said fluorescent substances for the quantitative determination of said chemical parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification