Capillary electrophoresis enzyme immunoassay
First Claim
1. A method for performing an assay comprising:
- (a) introducing a first reactant and a sample containing an analyte into a channel containing an electrophoresis medium,wherein the analyte comprises or is complexed to a competitor, said competitor comprising a biorecognition portion and a second reactant portion;
(b) applying an electric potential along the length of the channel to cause said first reactant and said second reactant portion of said competitor to form or deplete a detectable product;
(c) imposing along the length of said channel an electric potential sufficient to cause said detectable product to be separated from said first reactant by differential migration along said channel; and
(d) detecting said detectable product.
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Accused Products
Abstract
Disclosed are methods and apparatus for performing highly sensitive enzyme-amplified assays using channel electrophoresis of an enzyme having a biorecognition moiety. Combining a binding reaction of an analyte and an enzyme having a biorecognition moiety, and an electrophoretic separation which uses enzyme-amplified detection methodology, assay methods and apparatus are provided that offer simplicity, quantitative sensitivity and rapid analysis. Also disclosed are highly sensitive catalytically-amplified assays using a capillary electrophoresis format in which the binding reaction prior to electrophoresis is heterogeneous or homogeneous, and direct or competitive. The methods and apparatus for conducting sensitive automated catalytically-amplified assays using electrophoresis may be conducted in a microscale format.
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Citations
29 Claims
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1. A method for performing an assay comprising:
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(a) introducing a first reactant and a sample containing an analyte into a channel containing an electrophoresis medium, wherein the analyte comprises or is complexed to a competitor, said competitor comprising a biorecognition portion and a second reactant portion; (b) applying an electric potential along the length of the channel to cause said first reactant and said second reactant portion of said competitor to form or deplete a detectable product; (c) imposing along the length of said channel an electric potential sufficient to cause said detectable product to be separated from said first reactant by differential migration along said channel; and (d) detecting said detectable product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for performing an assay, said method comprising:
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(a) conducting a heterogeneous competitive reaction in a vessel among an immobilized reactant, an analyte, and a competitor, wherein the competitor comprises a biorecognition portion and a second reactant portion; (b) introducing an aliquot of the competitor which is unbound in step (a) into a channel containing an electrophoresis medium and a first reactant; (c) imposing an electrical potential along the length of the channel to cause, the second reactant portion of the competitor and the first reactant to form or deplete a detectable product within the channel; and (d) detecting the detectable product. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. An analytical device comprising a capillary zone electrophoresis channel, said channel comprising:
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a free solution electrophoretic medium, a first reactant in said electrophoretic medium that will react in said channel with a second reactant portion of a competitor to form or deplete a detectable product wherein the competitor further comprises a biorecognition portion; and said analytical device further comprising electrical power means for applying a field across the ends of said channel to cause said first reactant and said second reactant portion of said competitor to migrate and react. - View Dependent Claims (26, 27, 28, 29)
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Specification