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Last Updated: July 26, 2021

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Patent: 5,310,647

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Summary for Patent: 5,310,647
Title: Detection and measurement of destructive and polymer forming enzymes by colloidal flocculation
Abstract:The change between a dispersed state and a flocculated state of a colloidal agent (e.g. Congo Rubin, colloidal gold) is used to provide sensitive visual detection and optionally assay of enzyme in a sample. The test cell includes a substrate for the enzyme, and, depending on the action of the enzyme, polymer which protects the colloid from electrolyte-induced flocculation is either formed or destroyed by the test reaction. In a test for a hydrolytic enzyme (e.g. a protease) the colloid loses protection and flocculates. In a test for a polymer-forming enzyme, the colloid gains protection and is prevented from flocculating by added electrolyte, or alternatively, depending on the polymer\'s behavior, becomes more sensitive to the flocculating action of the added electrolyte. The measurement may be quantitated using an instrumental monitor. The test uses a natural substrate for the enzyme to be assayed (e.g., gelatin for the gelatinase class of enzymes) and may achieve rapid speed. The test may be performed using a biologically-derived sample for diagnostically relevant purposes, e.g. to detect an enzyme indicative of periodontal disease. A kit for performing the test is also disclosed.
Inventor(s): Kerschensteiner; Daniel A. (Chester County, PA)
Assignee: Cherrystone Corporation (Wayne, PA)
Application Number:07/861,654
Patent Claims:see list of patent claims

Details for Patent 5,310,647

Applicant Tradename Biologic Ingredient Dosage Form BLA Number Approval Date Patent No. Assignee Estimated Patent Expiration Status Orphan Source
Smith And Nephew SANTYL collagenase OINTMENT;TOPICAL 101995 001 1965-06-04 ⤷  Free Forever Trial Cherrystone Corporation (Wayne, PA) 2039-03-29 RX search
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Number >Approval Date >Patent No. >Assignee >Estimated Patent Expiration >Status >Orphan >Source

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