Eastman-Kodak Company

William N Washburn

Kenneth R Hollister

Ewell R Cook

Stephen P Singer

Jared B Mooberry

Robert T Belly

Drake M Michno

John M Buchanan

Glen M Dappen

Lee J Fleckenstein

Gary S Proehl

Compounds and reagents containing the compounds are disclosed for detecting oxidase positive organisms. The compounds have the structure

Reagents for detecting oxidase positive microorganisms

A novel blocked photographically useful compound comprises a new blocking group that (a) comprises two electrophilic groups, the least electrophilic of which is bonded directly or through a timing group to the photographically useful group (PUG) of the compound, (b) is capable of reacting with a dinucleophile reagent, and (c) has the two electrophilic groups separated from each other by a bond or unsubstituted or substituted atom that enables nucleophilic displacement to occur with release of PUG when the compound is reacted with a dinucleophile reagent. Such a blocked photographically useful compound is useful in a photographic material and process to provide increased stability and enable more rapid release of the photographically useful group upon reaction with a dinucleophile reagent.

Photographic element and process comprising a blocked photographically

Essentially colorless, hydrophilic ligand-releasing polymers are prepared from ethylenically unsaturated polymerizable monomers represented by the structure: ##STR1## wherein R' is hydrogen or lower alkyl, COUP is a photographic color coupling moiety, LINK is a coupling-off group which can be cleaved by an oxidized developer composition, and LIG is a ligand capable of complexing with metal ions, while joined to the polymer, to form a dye. These polymers also have recurring units which impart hydrophilicity to the polymer. These polymers form metal complex dyes in unexposed areas of photographic elements only, while the ligand is cleaved from the polymer in the exposed areas and washed out of the element.

Colorless ligand-releasing monomers and polymers and their use to

Particular heterocyclic compounds are useful as color-forming couplers in analytical compositions, elements and methods. These compounds are represented by the structure: ##STR1## wherein R is a solubilizing group, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently hydrogen, alkyl, alkoxy, aryl, aryloxy, a heterocyclic group, halo, amino or R, and Z represents the carbon atoms necessary to complete the nucleus of a 5- or 6-membered fused ring. The color-forming coupler is combined with an oxidizable color developing compound, e.g. 4-aminoantipyrine to provide a chromogenic composition. This composition can be used in solution or dry assays of biological fluids to produce a color dye in the presence of hydrogen peroxide or other analytes, e.g. glucose or uric acid, which react to produce hydrogen peroxide.

Color-forming couplers and their use in the analytical determination of

A process of obtaining highly stable color masking dyes comprises use of an element which has a support having thereon at least one silver halide emulsion layer having associated therewith an essentially colorless, immobile, ligand-releasing compound of the structure LIG-X. In this structure, X is a group which, as a function of silver halide development, is cleaved from LIG, and LIG is a ligand capable of complexing with metal ions while joined to X to form a color masking dye. A color masking dye is formed by developing the imagewise exposed areas of the described element with a developing agent to cleave LIG from X and washing substantially all of the cleaved LIG moieties in those areas out of the element, and treating the element with metal ions to form a masking dye complex with LIG-X in unexposed areas.

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Ionia, NY, United States of America

William N Washburn