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Immunoassays of peptide hormones and their chemical aspects

The N‐terminal maleoyl‐β‐alanyl derivative of human gastrin‐[2–17] has been synthesized as a model compound to investigate the usefulness of such peptide derivatives for their mild and selective conjugation, via reaction with thiol groups, to high‐molecular‐weight carrier molecules to produce antigens, as well as to radioiodinable or fluorogenic molecules to prepare tracers for immunoassays. In this context the examined enzyme substrate‐gastrin conjugate was found to exhibit the full immunoreactivity of the parent peptide and to be well suited as tracer in a gastrin fluorescence‐immunoassay.