title: Identification of 19-nor-deoxycorticosterone in normal rat serum by enzyme immunoassay and gas chromatography-mass spectrometry.
abstract: Recent reports on the isolation and identification of 19-nor-deoxycorticosterone from the urine of rats with adrenal regeneration hypertension give rise to the possibility of a role of this steroid in the pathogenesis of low renin essential hypertension. The present study was undertaken to investigate the presence of 19-nor-deoxycorticosterone in normal rat serum both by a sensitive enzyme immunoassay and by gas chromatography-mass spectrometry (GC/MS). 19-Nor-deoxycorticosterone in rat serum was separated from other steroids prior to enzyme immunoassay by using high performance liquid chromatography (HPLC). The average concentration of 19-nor-deoxycorticosterone in normal rat serum was 137 +/- 62 ng/dl (mean +/- SD, n = 32). Pooled normal rat serum (50 ml) was purified by HPLC and the purified sample was acetylated with acetic anhydride for GC/MS measurement. The retention time and m/z ions (358, 285, and 257) on the resulting mass fragmentogram coincided in position with those of authentic 21-acetoxy-19-nor-deoxycorticosterone and acetylated normal rat serum extract. The combined characteristics of HPLC elution, antigen-antibody reaction, GC retention and selected ion responses provided strongly evidence supporting the presence of 19-nor-deoxycorticosterone in normal rat serum.
mesh_terms: D000469:Alkaline Phosphatase; D000818:Animals; D002417:Cattle; D003900:Desoxycorticosterone / Q000031:analogs & derivatives* / Q000097:blood; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D007124:Immunoenzyme Techniques; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D012016:Reference Values
chemical_list: D003900:Desoxycorticosterone; C019026:19-nordeoxycorticosterone; D000469:Alkaline Phosphatase