Novel and ultrasensitive noncompetitive enzyme immunoassay (hetero-two-site complex transfer enzyme immunoassay) for alpha-human atrial natriuretic peptide.

Abstract:

:A novel and ultrasensitive noncompetitive enzyme immunoassay (hetero-two-site complex transfer enzyme immunoassay) for alpha-human atrial natriuretic peptide (alpha-hANP) in plasma is described. alpha-hANP was biotinylated using N-hydroxysuccinimidobiotin and trapped onto an anti-alpha-hANP [6-28] IgG-coated polystyrene ball. After washing, biotinylated alpha-hANP was eluted from the polystyrene ball with HCI and was reacted with 2,4-dinitrophenyl-fluorescein-bovine serum albumin-disulfide-rabbit anti-alpha-hANP [6-28] IgG conjugate. The complex formed was trapped onto (anti-2,4-dinitrophenyl group) IgG-coated polystyrene balls and, after washing, reacted with avidin-beta-D-galactosidase conjugate. The polystyrene balls were washed, and the complex of the three components was eluted with epsilon N-2, 4-dinitrophenyl-L-lysine and transferred to anti-fluorescein IgG-coated polystyrene balls. After washing, the complex was released from the polystyrene balls by reduction with 2-mercaptoethylamine and transferred to (anti-rabbit IgG) IgG-coated polystyrene balls. beta-D-Galactosidase activity bound to the last polystyrene balls was assayed by fluorometry. The detection limit of alpha-hANP [1-28] was 3 fg (1 amol)/tube. Interference by plasma proteins was eliminated by separation of peptides from proteins using a molecular sieve. The assay range of plasma alpha-hANP [1-28] was 0.04-120 ng/L, and plasma levels of hANP in healthy subjects (11-56 ng/L) were measured without concentration.

journal_name

J Clin Lab Anal

authors

Hashida S,Ishikawa E

doi

10.1002/jcla.1860060407

subject

Has Abstract

pub_date

1992-01-01 00:00:00

pages

201-8

issue

4

eissn

0887-8013

issn

1098-2825

journal_volume

6

pub_type

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