Abstract
1. Gradient elution (sodium chloride concentration gradient) on DEAE-Sephadex columns is used to separate urinary oestrogen conjugates of pregnancy urine. Changes in the shape of the gradient alter the chromatograms in a predictable manner so that the dispersion of peaks can be modified at will. 2. Suitable choice of the gradient results in the separation from each other of oestrogen sulphates, oestrogen 16(or 17)-glucosiduronates, oestrogen 3-glucosiduronates and free oestrogens. 3. Evidence for the presence of oestriol 3-sulphate, oestrone 3-sulphate, 17beta-oestradiol 3-sulphate, 16-oxo-17beta-oestradiol 3-sulphate and oestriol 16(or 17)-sulphate in the sulphate fraction of DEAE-Sephadex chromatograms of pregnancy urine is provided.