Electrochemical sensors membrane
First Claim
1. A sensor comprising a semi-permeable membrane which permits passage of water, oxygen and at least one selective analyte and which has the ability to absorb water, for contacting a test sample, said membrane having a high boiling point, water soluble, hydrophilic polymer liquid anti-drying agent which is added after said membrane has been formed so that the sensor storage life is prolonged and wet-up is facilitated.
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Abstract
A solid state, multi-use electrochemical sensor having an electrically nonconductive substrate, a working electrode, and a semi-permeable membrane covering the working electrode. The working electrode includes an electrically conductive material adhered to a portion of the substrate. A first portion of the conductive material is covered with an electrically insulating dielectric coating, and a second portion of the conductive material is covered with an active layer. The active layer includes a catalytically active quantity of an enzyme carried by platinized carbon powder particles, which are distributed throughout the active layer. A sensor package for incorporating a sensor is provided.
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Citations
7 Claims
- 1. A sensor comprising a semi-permeable membrane which permits passage of water, oxygen and at least one selective analyte and which has the ability to absorb water, for contacting a test sample, said membrane having a high boiling point, water soluble, hydrophilic polymer liquid anti-drying agent which is added after said membrane has been formed so that the sensor storage life is prolonged and wet-up is facilitated.
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7. A method for prolonging the storage life or wet-up of an electrochemical sensor including a semi-permeable membrane, said method comprising treating the semi-permeable membrane after formation with a high boiling point, water soluble, hydrophilic polymer liquid anti-drying agent selected from the group consisting of surfactants having a molecular weight of at least about 300 and polyethylene glycols.
Specification