title: Detection of nanogram quantities of vitamin D by gas-liquid chromatography.
mesh_terms: D002762:Cholecalciferol / Q000032:analysis*; D002849:Chromatography, Gas; D004872:Ergocalciferols / Q000032:analysis*; D013261:Sterols / Q000032:analysis; D014807:Vitamin D / Q000032:analysis*
chemical_list: D004872:Ergocalciferols; D013261:Sterols; D014807:Vitamin D; D002762:Cholecalciferol