Optical biosensor and method of use
First Claim
1. A process for the detection of analyte molecules in a sample comprising providing a sensor consisting of a) a solid support,b) a single layer or multi-layer Langmuir-Blodgett (LB) film attached to the surface of said support a),c) at least one fluorescent dye F1 which is located in the top layer or in case of a multi-layer Langmuir-Blodgett film, in at least one of the top four layers of the Langmuir-Blodgett film,d) a first receptor molecule which is capable of specific binding with said analyte molecule and which is bonded covalently or by absorption in or on the topmost layer of the Langmuir-Blodgett film, ande) exposing said sensor to said sample and a mobil fluorescent dye F2 whose excitation band overlaps sufficiently for an energy transfer with the emission band of said dye F1 and whiche1) is covalently bonded to a second receptor molecule which competes with said analyte molecules for specifically binding to said first receptor molecule d) or whiche2) is covalently bonded to a third receptor molecule which is able to bind to a complex composed of the first receptor molecule d) and said analyte molecule,where the second molecule or the complex of the analyte molecule and the third receptor molecule are initially not bound to the Langmuir-Blodgett film,and detecting a change in the level of fluorescence energy transfer in response the said exposing step.
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Abstract
The present invention relates to a sensor with a novel construction for a detection method of molecules labelled with fluorescent dye for detecting these dissolved substances or analytes by energy transfer with a simple fluorescence technique and increased sensitivity in the detection as well as versatile use for different tasks and the possibility of reproducible preparation of films bound to solid surfaces.
187 Citations
12 Claims
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1. A process for the detection of analyte molecules in a sample comprising providing a sensor consisting of a) a solid support,
b) a single layer or multi-layer Langmuir-Blodgett (LB) film attached to the surface of said support a), c) at least one fluorescent dye F1 which is located in the top layer or in case of a multi-layer Langmuir-Blodgett film, in at least one of the top four layers of the Langmuir-Blodgett film, d) a first receptor molecule which is capable of specific binding with said analyte molecule and which is bonded covalently or by absorption in or on the topmost layer of the Langmuir-Blodgett film, and e) exposing said sensor to said sample and a mobil fluorescent dye F2 whose excitation band overlaps sufficiently for an energy transfer with the emission band of said dye F1 and which e1) is covalently bonded to a second receptor molecule which competes with said analyte molecules for specifically binding to said first receptor molecule d) or which e2) is covalently bonded to a third receptor molecule which is able to bind to a complex composed of the first receptor molecule d) and said analyte molecule, where the second molecule or the complex of the analyte molecule and the third receptor molecule are initially not bound to the Langmuir-Blodgett film, and detecting a change in the level of fluorescence energy transfer in response the said exposing step.
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2. A sensor for the detection of analyte molecules based on fluorescence energy transfer (Forster transfer) consisting of
a) a solid support, b) a single layer or multi-layer Langmuir-Blodgett film (LB) attached to the surface of said support a), c) at least one fluorescent dye F1 which is located in the top layer or in case of a multi-layer Langmuir-Blodgett film, in at least one of the top four layers of the Langmuir-Blodgett film, d) a receptor molecule which is capable of specific interaction with a ligand molecule and which is bonded covalently or by adsorption in or on the topmost layer of the Langmuir-Blodgett film.
Specification