title: Accelerator mass spectrometry of small biological samples.
abstract: Accelerator mass spectrometry (AMS) is an ultra-sensitive technique for isotopic ratio measurements. In the biomedical field, AMS can be used to measure femtomolar concentrations of labeled drugs in body fluids, with direct applications in early drug development such as Microdosing. Likewise, the regenerative properties of cells which are of fundamental significance in stem-cell research can be determined with an accuracy of a few years by AMS analysis of human DNA. However, AMS nominally requires about 1 mg of carbon per sample which is not always available when dealing with specific body substances such as localized, organ-specific DNA samples. Consequently, it is of analytical interest to develop methods for the routine analysis of small samples in the range of a few tens of microg. We have used a 5 MV Pelletron tandem accelerator to study small biological samples using AMS. Different methods are presented and compared. A (12)C-carrier sample preparation method is described which is potentially more sensitive and less susceptible to contamination than the standard procedures.
authors.affiliation: Department of Engineering Sciences, Uppsala University, SE-751 21 Uppsala, Sweden. mehran.salehpour@angstrom.uu.se
authors.forename: Mehran
authors.initials: M
authors.lastname: Salehpour
authors.forename: Niklas
authors.initials: N
authors.lastname: Forsgard
authors.forename: Göran
authors.initials: G
authors.lastname: Possnert
mesh_terms: D000465:Algorithms; D000818:Animals; D002247:Carbon Isotopes / Q000032:analysis; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004247:DNA / Q000032:analysis*; D005399:Fishes / Q000235:genetics; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods; D010315:Particle Accelerators; D012680:Sensitivity and Specificity
chemical_list: D002247:Carbon Isotopes; D004247:DNA