Method for fabricating biosensors using hydrophilic polyurethane
First Claim
1. A method for fabricating a biosensor composed of a signal detector and a signal transducer, comprising:
- a) obtaining a mixture solution by dissolving a mixture consisting essentially of hydrophilic polyurethane synthesized from polyethylene glycol, polypropylene glycol, ethylene glycol and diisocyanate, and a bio-active reagent into a solvent selected from the group consisting of tetrahydrofuran, methanol and mixture thereof; and
b) directly immobilizing the mixture on the signal transducer by coating the mixture solution onto the signal transducer and then drying to form a membrane of the hydrophilic polyurethane having the bio-active reagent incorporated therein, wherein the hydrophilic polyurethane stabilizes the bio-active reagent and the bio-active reagent retains activity.
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Abstract
Disclosed is a method for fabricating biosensors, using hydrophilic polyurethane. Bio-active reagents, including enzymes, antibodies, antigens, cells and receptors, are mixed with hydrophilic polyurethane and the mixture is directly coated over a signal transducer to form a sensing film which serves as a signal detector. The method using hydrophilic polyurethane allows the simplification of the fabrication of biosensors without conducting complicated chemical reactions and washing steps, such as crosslinking. The bio-active reagent entrapped within the hydrophilic polyurethane film can retains its high activity for an extended period of time and the intrinsic potentiometric response of the underlying ion-selective polymeric membrane is not affected by the bio-active reagent immobilized polyurethane film coated on its sensing surface. Therefore, the biosensors are superior in specificity, selectivity, and stability. Also, the adoption of solid-state type electrodes by virtue of the direct immobilization of the bio-active reagents allows the biosensors to be miniaturized, offering the advantages of the detection of small quantities of samples and mass production for low cost.
31 Citations
14 Claims
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1. A method for fabricating a biosensor composed of a signal detector and a signal transducer, comprising:
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a) obtaining a mixture solution by dissolving a mixture consisting essentially of hydrophilic polyurethane synthesized from polyethylene glycol, polypropylene glycol, ethylene glycol and diisocyanate, and a bio-active reagent into a solvent selected from the group consisting of tetrahydrofuran, methanol and mixture thereof; and
b) directly immobilizing the mixture on the signal transducer by coating the mixture solution onto the signal transducer and then drying to form a membrane of the hydrophilic polyurethane having the bio-active reagent incorporated therein, wherein the hydrophilic polyurethane stabilizes the bio-active reagent and the bio-active reagent retains activity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification