Loading…

Development of a competitive lateral flow immunoassay for progesterone: influence of coating conjugates and buffer components

Several aspects of the development of competitive lateral flow immunoassays (LFIAs) are described. The quantitation of progesterone is taken as an example. The LFIA format consisted of a nitrocellulose membrane spotted with various progesterone conjugates as the test line. A mixture of primary antib...

Full description

Saved in:
Bibliographic Details
Published in:Analytical and bioanalytical chemistry 2008-11, Vol.392 (6), p.1215-1223
Main Authors: Posthuma-Trumpie, Geertruida A, Korf, Jakob, van Amerongen, Aart
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Several aspects of the development of competitive lateral flow immunoassays (LFIAs) are described. The quantitation of progesterone is taken as an example. The LFIA format consisted of a nitrocellulose membrane spotted with various progesterone conjugates as the test line. A mixture of primary antibody and secondary antibody adsorbed to colloidal carbon was used for signal generation. A digital scanner and dedicated software were used to quantitate the response. A reappraisal of the checkerboard titration, often used in the optimisation of immunoassays, is discussed. Surprisingly, the highest sensitivity of the LFIA format (IC₅₀ of 0.6 μg L⁻¹ progesterone in buffer) was achieved by using a high coating concentration of the analyte-protein conjugate and a high dilution of the antibody solution. Immediate addition of all reagents in LFIA was superior to premixing the components and allowing prereaction. Of several blocking agents tested bovine serum albumin was superior in performance, whereas the combination of ovalbumin and progesterone substantially influenced test results.
ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-008-2362-8