Eastman-kodak Company

David M Taylor

Ignazio S Ponticello

Richard L Detwiler

Stephen C Hasselberg

Clifford Leon Everts

Paul John Delmore

A colorimetric assay for the determination of conjugated or unconjugated bilirubin in biological fluids can be carried out with an improved analytical element. The element includes a support having thereon a gelatin-free mordant layer with a positively-charged interactive mordant having at least one binding site for bilirubin, a radiation-blocking layer, and a porous spreading layer. The interactive mordant is dispersed in a binder material of crosslinkable copolymers which include a monomer capable of reaction with a crosslinking agent to crosslink the copolymer.

Bilirubin assay using crosslinkable polymers

A colorimetric assay for the determination of conjugated, unconjugated or total bilirubin in biological fluids can be carried out with an improved analytical element. This element comprises a support having thereon a substantially gelatin-free mordant layer comprising a positively-charged interactive mordant having at least one binding site for bilirubin, a radiation-blocking layer, and a porous spreading layer. This element does not contain any colorimetric or fluorometric interactive compositions for bilirubin other than the mordant.

Method for the determination of bilirubin and an element useful therein

A process is described for improving the properties of a phosphor material comprising an oxysulfide that has been subjected to grinding, in which the phosphor material is heated while exposed to an oxygen-containing atmosphere at a temperature of about 600.degree. to about 1000.degree. C. The processed phosphor material can be used, for instance, in x-ray screens.

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Rochester, NY, United States of America

David M Taylor