Biosensor and method for operating the latter

US7851202B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Maximilian Fleischer · Ehrenkirchen, DE
• Corinna Haindl · Mannheim, DE
• Hans Meixner · Haar, DE
• Elfriede Simon · Munich, DE

Key dates

• Filing date: Jan 27, 2005
• Grant date: Dec 14, 2010
• Expiry date: Aug 23, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/5438
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A biosensor for detecting an antigen using an antigen/antibody coupling includes: a silicon substrate, at least one interdigital electrode pair structure that is located on the silicon substrate, the electrode pair being interspaced at a maximum distance of 1.0 μm; a counter-electrode on the silicon substrate; a reference electrode; a first layer of protein, covering at least the interdigital electrode structure; a selective second protein layer applied to the first layer and containing a capture antibody selected specifically with respect to the antigen of interest and to which the antigen can be coupled. A sensor signal can be read on the interdigital electrode structure, if the antigen is coupled to the capture antibody by way of a sample to be analyzed that comes into contact with the biosensor and a redox reactive molecule is enzymatically released on the sensor surface by an enzyme-marked detection antibody likewise coupled to the antigen.