Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Calorimeter
Patent
1994-10-31
1997-01-07
Snay, Jeffrey
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Calorimeter
422 8208, 4271632, G01N 2164
Patent
active
055914004
ABSTRACT:
The present invention provides processes for the preparation of ionic sensors that include a matrix material, such as ion-permeable cellulose, having a sensing component included therein, such as a fluorescent dye, and an opaque overcoat material. For example, the present invention provides a method of making an ionic sensor comprising: contacting a water-swellable ion-permeable matrix material with an aqueous-based bath of a sensing component, or precursor thereof, under conditions effective to covalently attach the sensing component, or precursor thereof, to the water-swellable ion-permeable matrix material; wherein the aqueous-based bath comprises water and an organic solvent in an amount effective to solubilize the sensing component, or precursor thereof; contacting the water-swellable ion-permeable matrix material having covalently attached sensing component, or precursor thereof, with an aqueous solution having a pH of at least about 10 and an ionic strength of at least about that of a 5% aqueous sodium chloride solution to form a sensing element; and covering the sensing element with an opaque overcoat material. Also provided is a method of making a precursor to a preferred sensing component, i.e., acetoxypyrenetris(sulfonyl)chloride, which is made using a thionyl chloride method. If the sensing component is attached to the matrix material using amine groups, any unreacted amine groups can be capped by contacting them with a solution comprising an acetylating agent, an organic amine, and an ethereal solvent.
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Dektar John L.
Patil Sanjay L.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Snay Jeffrey
Ubel F. Andrew
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