title: A new method for carbon isotopic analysis of protein.
abstract: The reaction of ninhydrin with amino acids can be used in carbon isotopic studies of protein. The reaction can be applied to extract as carbon dioxide only peptide-bonded carbon in proteinaceous material, thus avoiding most, if not all, contaminants. Test radiocarbon dates on ancient bone indicate that the method provides reliable ages, and stable carbon isotopic data suggest that our understanding of isotopic dietary reconstruction needs detailed examination. The technique should also be useful in biochemical tracing experiments and in global carbon budget studies, and the underlying principle may be applicable to other isotopes and molecules.
authors.affiliation: Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, CA 94550.
authors.forename: D E
authors.initials: DE
authors.lastname: Nelson
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000737:chemistry*; D002247:Carbon Isotopes; D002250:Carbon Radioisotopes; D008322:Mammals; D009555:Ninhydrin; D010163:Paleontology; D011506:Proteins / Q000032:analysis*; D011865:Radioisotope Dilution Technique
chemical_list: D002247:Carbon Isotopes; D002250:Carbon Radioisotopes; D011506:Proteins; D009555:Ninhydrin