B12 enzyme immunoassay and sample pretreatment

Details B12 enzyme immunoassay and sample pretreatment B12 enzyme immunoassay and sample pretreatment

G - Physics

01

N

G01N 33/82 (2006.01) G01N 1/28 (2006.01) G01N 33/53 (2006.01)

Patent

CA 2071173

Denaturing agents used to pretreat test samples for immunoassays are neutralized and deactivated by the addition of a treatment agent which is a combination of a buffering agent in acid form and an agent for converting the sulfhydryl groups of the denaturing agents to a non-active form such as disulfides or alkylthio groups. The treatment agent serves this function without having sufficient denaturing activity by itself to interfere with subsequent steps of the assay procedure. Also disclosed is a protocol for a vitamin B12 assay which involves a sequential rather than competitive binding of the B12 with excess intrinsic factor followed by the binding of excess enzyme-labeled B12 to any remaining intrinsic and immobilizing such intrinsic factor on a solid phase. Various problems associated with B12 assays are avoided by this technique.

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