Method for detecting an analyte using an electrochemical luminescent transition metal label
First Claim
1. A method for detecting an analyte, comprising the steps of:
- a) adding a label, an hydroxylamine, and an analyte of an aqueous solution;
b) stimulating the label to emit electromagnetic radiation in an electrochemical luminescence reaction, in the absence of applying an oxidative potential by applying a reducing potential to the aqueous solution, and;
(c) detecting the analyte by detecting the electromagnetic radiation emitted by the label.
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Abstract
A method for detecting an analyte, in an aqueous solution at a physiological pH, by reductive or oxidative/reductive electrochemical luminescence methodologies is disclosed. The method proceeds by labelling the analyte with a transition metal complex, followed by inducing the transition metal label to luminescence by application of a suitable electrical potential to a solution containing the label and the analyte. The transition metal complex can be a tris-ruthenium(bipyridine) complex. A hydroxylamine and/or a halogen-containing moiety can be used to enhance both reductive and/or oxidative electrochemical luminescence of the transition metal complex. The transition metal chelate can be used as a label for the detection of picomolar concentrations of an analyte of interest, such as an analyte present in a sample of a physiological fluid.
85 Citations
36 Claims
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1. A method for detecting an analyte, comprising the steps of:
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a) adding a label, an hydroxylamine, and an analyte of an aqueous solution; b) stimulating the label to emit electromagnetic radiation in an electrochemical luminescence reaction, in the absence of applying an oxidative potential by applying a reducing potential to the aqueous solution, and; (c) detecting the analyte by detecting the electromagnetic radiation emitted by the label. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for detecting an analyte, comprising the steps of:
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(a) preparing an aqueous solution comprising a suitable buffer for maintaining the aqueous solution at a physiological pH; (b) selecting a label comprising a transition metal and an organic ligand chelated to the transition metal, the label being capable of emitting electromagnetic radiation with an emission maximum between about 200 nm and about 900 nm in an electrochemical luminescence reaction; (c) adding; (i) an analyte present in a sample of a physiological fluid, (ii) the label, (iii) an amine and, (iv) an ECL facilitator selected from the group consisting of halides and hydroxylamines, to the aqueous solution, the aqueous solution thereby comprising at least about 95% by weight water and at least about 98% by volume water; (d) stimulating the label to emit electromagnetic radiation in an electrochemical luminescence reaction, in the absence of applying an oxidative potential by applying a reducing potential to the aqueous solution, (e) detecting the presence or the absence of the analyte by detecting the electromagnetic radiation; and (f) quantifying the amount of analyte present in the sample of the physiological fluid. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method for detecting a transition metal complex, comprising the steps of:
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(a) adding a transition metal complex and an hydroxylamine to an aqueous solution; (b) stimulating the transition metal complex to emit electromagnetic radiation in an electrochemical luminescence reaction, in the absence of applying an oxidation potential by applying a reducing potential to the aqueous solution, and; (c) detecting the transition metal complex by detecting the electromagnetic radiation emitted by the transition metal complex.
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Specification