Gas chromatographic and mass spectrometric analysis of permethylated estrogen glucuronides

Fast atom bombardment mass spectrometry of estrogen glucuronides and sulfates

Fast atom bombardment (FAB) mass spectra of 13 intact, underivatized glucuronides and/or sulfate salts are reported. Spectra are characterized by abundant ions formed by attachment of a proton, [M+H]+, or of an alkali ion, [M+alkali]+, to the glucuronide or sulfate salt. Fragment ions were of low intensity. FAB spectra can be used to obtain the molecular weight of a sample, to assess its purity and to identify the nature of the alkali of the glucuronide or sulfate salt.

Derivatization of estrogen conjugates for analysis by capillary gas chromatography

By using 20 meter wall-coated open tubular glass capillary columns of high stability, analysis of methyl ester, methyloxime trimethylsilyl ether derivatives of estrogen glucuronides had been achieved. Relative retention times of five glucuronide conjugates on OV-1 stationary phase are reported. Estrogen sulfates conjugated at the 3-position were shown to be quantitatively hydrolyzed and derivatized in a single trimethylsilylation step, and this method of direct derivatization was compared to two solvolysis methods. These analytical methods could be further developed to allow rapid and quantitative analysis of estrogens in biological fluids, and may prove particularly useful for analysis of labile compounds.