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Silver ion microplates for immunoassays.

M R Bonen¹, S A Hoffman, A A García

¹Arizona State University, Tempe, AZ, USA.

|June 21, 2001

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Silver ions in microplate wells effectively immobilize biotin-labeled proteins like horseradish peroxidase (HRP) and antibodies, enabling sensitive detection. This method enhances bioactivity and reduces background noise for improved assays.

Area of Science:

Biochemistry
Materials Science
Analytical Chemistry

Background:

Surface modification of microplates is crucial for immobilizing biomolecules.
Developing stable and active immobilization methods is essential for sensitive immunoassays.

Purpose of the Study:

To develop a novel method for immobilizing biotin-labeled proteins using silver ions on microplate surfaces.
To evaluate the efficiency and bioactivity of immobilized proteins and antibodies.
To determine the sensitivity and specificity of assays utilizing these modified microplates.

Main Methods:

Microplate wells were coated with silver ions using glutaraldehyde and thiourea.
Biotin-labeled horseradish peroxidase (HRP) and antibodies were immobilized onto silver ion-modified surfaces.

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Surface coverage, binding constants, and detection limits were determined.

Bioactivity of immobilized antibodies was assessed.

Main Results:

Silver ions facilitated the immobilization of active biotin-labeled HRP and antibodies.
Maximum surface coverage for biotin-HRP was 40 ng/cm², with a binding constant (Km) of 8 x 10^9 M.
Detection of as little as 6.7 fmol of HRP was achieved.
Low background binding was observed, enabling sensitive detection (10^-14 to 10^-11 mol HRP).

Conclusions:

Silver ion-modified microplates provide an effective platform for immobilizing bioactive proteins.
This method offers high sensitivity and low background for biochemical assays.
The approach is suitable for developing advanced diagnostic and detection systems.