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1. (WO1979000880) QUANTITATIVE TESTING FOR VITAMIN B12
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000880 International Application No.: PCT/US1979/000210
Publication Date: 01.11.1979 International Filing Date: 04.04.1979
IPC:
G01N 33/82 (2006.01)
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
33
Investigating or analysing materials by specific methods not covered by groups G01N1/-G01N31/131
48
Biological material, e.g. blood, urine; Haemocytometers
50
Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
82
involving vitamins
Applicants:
Inventors:
Priority Data:
89352404.04.1978US
Title (EN) QUANTITATIVE TESTING FOR VITAMIN B12
(FR) DETERMINATION QUANTITATIVE DE VITAMINE B12
Abstract:
(EN) The vitamin B12 (cobalamin) level of human blood and mammalian tissue is routinely assayed utilizing radioisotope dilution assay (RIDA) techniques. The presence of vitamin "B12 analogues" in such samples, which analogues are erroneously assayed as true vitamin B12 utilizing prior an RIDA techniques, has been determined. Such errors are due to the fact that binding proteins commonly used in prior art RIDA techniques normally include proteins which bind both true vitamin B12 and previously unrecognized vitamin B12 analogues. The errors caused by the B12 analogues are avoided by using a composition for binding vitamin B12 which is substantially free of substances which bind vitamin B12 analogues. Moreover, by using both types of binders in separate assays, the amount of analogue present may be arrived at by taking the difference of the assays.
(FR) La teneur en vitamine B12 (cobalamine) du sang humain et des tissus mammiferes est habituellement controlee en utilisant les techniques de titrage par dilution radioisotopique (RIDA). La presence de "sub stances analogues" a la vitamine B 12 dans de tels echantillons, les dites substances analogues ayant ete analysees par erreur comme etant veritablement de la vitamine B12 en utilisant les techniques RIDA de l"art anterieur, a ete determinee. De telles erreurs sont dues au fait que des proteines de liaison utilisees communement dans les techniques RIDA de l"art anterieur comprennent normalement des proteines qui lient a la fois la vraie vitamine B12 et les substances analogues a la vitamine B12 anterieurement non reconnues. Les erreurs dues aux substances analogues a la vitamine B12 sont evitees en utilisant une composition de liaison de la vitamine B12 qui est substantiellement exempte de substances qui lient les substances analogues a la vitamine B12. De plus, en utilisant les deux types de liants dans des essais separes, on peut determiner la quantite de substances analogues presentes en faisant la difference des essais.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)