The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 2001
Filed:
Feb. 09, 2000
Allan Otto Fog Lihme, Birkerød, DK;
Margit Wikborg, Copenhagen, DK;
Kem-En-Tec A/S, Copenhagen, DK;
Abstract
The present invention relates to a method of using a storage-stable, pre-stained 3,3′,5,5′-tetramethylbenzidine (TMB) substrate in an enzyme substrate. The TMB substrates comprise: (a) a water-based TMB substrate composition which includes a peroxide, e.g., hydrogen peroxide or urea hydrogen peroxide, and (b) a dye which is soluble therein. Suitable dyes to be included in the substrate preferably have an absorbance at 450 nm of at the most milli absorbance units. Examples of dues are Pholixine B, Eosin B and Quinaldine Red. The substrates are advantageous in that they include a dye which is visible to the human eye. This is especially valuable when the substrates are handled and measured. The substrates are especially suitable for enzyme assays such as enzyme-linked-immunosorbent-assays (ELISA), e.g. horse radish peroxide (HRP) is used. The substrates may advantageously include less than 5% organic solvents and a solubility increasing agent such as polyvinylalcohol. The substrates are storage-stable for more than 12 months.