title: Utility and limitations of electron ionization and chemical ionization for the determination of position and extent of labeling for 18O- and 13C-containing permethylated alditols by gas chromatography/mass spectrometry.
mesh_terms: D002247:Carbon Isotopes; D055598:Chemical Phenomena; D002621:Chemistry; D008401:Gas Chromatography-Mass Spectrometry; D010103:Oxygen Isotopes; D013012:Sorbitol / Q000031:analogs & derivatives* / Q000032:analysis
chemical_list: D002247:Carbon Isotopes; D010103:Oxygen Isotopes; C049658:permethylsorbitol; D013012:Sorbitol