Enzyme-linked immunosorbent assay (ELISA) for steroid hormones with polyclonal and monoclonal antibodies: an assay for urinary aldosterone
1987
Abstract The development of non-competitive microtitre plate enzyme-linked immunosorbent assays for steroids was investigated using immobilised steroid as immunosorbent and enzyme-labelled second antibodies. An assay for testosterone with polyclonal anti-testosterone immunoglobulins was optimised with respect to a number of parameters but remained unsatisfactory for clinical assays. The results were applied to developing an aldosterone assay using monoclonal anti-aldosterone immunoglobulins. The latter method was used for the determination of urinary aldosterone and the results are compared with those obtained by a classical radioimmunoassay. Problems concerned with the use of sulphur-containing proteins and with the presence of low affinity antibodies in polyclonal preparations are discussed.
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