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In any food fortification program, the stability of added micronutrients is an important factor. Cholecalciferol or vitamin D3 is… Expand A modified version of the attached proton test (APT) sequence for 13C spectral editing, which we call CRisis‐APT (CRAPT), is… Expand A semi-automated high-performance liquid chromatographic (HPLC) method for the measurement of 25-hydroxyvitamins D(2) and D(3) is… Expand A simple one step high-performance liquid chromatographic (HPLC) procedure for the analysis of plasma concentrations of 25… Expand A high-performance liquid chromatographic (HPLC) method for estimating plasma 25-hydroxyvitamin D2 (25-OHD2) and 25… Expand Abstract Gas-liquid chromatography of vitamin D is complicated by the thermal rearrangement which occurs at the relatively high… Expand The reaction with maleic anhydride yielding Diels-Alder adducts is used to distinguish vitamin D isomers. Treatment at 100… Expand Abstract The conversion of the calciferols to isotachysterols using trifluoroacetic acid is described. The yield of… Expand Abstract Vitamin D upon gas-liquid chromatography undergoes thermal cyclization to the isomeric “pyro” and “isopyro” vitamin D… Expand