Sensalyse Holdings Limited

Geraldine Patricia Rigby

Pankaj M Vadgama

Sayed Ahmed

Sensor devices, and analytical methods using them, employing a detector protected from direct contact with samples being examined by a membrane made of a polyurethane modified with a non-ionic surfactant. The detector is preferably an electrode of conventional type (e.g. plantinum metal, optionally with pseudo, counter or reference electrodes) but especially an enzyme electrode. The surfactant may be incorporated into the polyurethane by admixture or by reacting chemically with the polyurethane, and is preferably a condensate of ethylene oxide with a compound containing a hydrophobic moiety&mdash;especially with a hydroxy-compound, e.g. an alkylated phenol, fatty alcohol or a sorbitan ester. Conveniently, the polyurethane membrane may contain up to 20 parts per 100 of polyurethane and be up to 10 microns thick, and formed by dip-coating an electrode. Measurements, using electrodes, may be made amperometrically.

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Merseyside, United Kingdom

Geraldine Patricia Rigby