title: The influence of sample collection methodology and sample preprocessing on the blood metabolic profile.
abstract: OBJECTIVE
  Blood serum and plasma have intrinsic differences in their composition and the preprocessing, such as clotting temperature in serum, and storage at room temperature may have further effect on metabolite concentrations.
  
  
  METHODS
  The influence of sampling preprocessing on the metabolic profiles in serum and different types of plasma was investigated using liquid chromatography and comprehensive 2D gas chromatography coupled to a mass spectrometer.
  
  
  RESULTS
  The profiles of polar metabolites were significantly dependent on the type of the sample, while lipid profiles were similar in serum and different types of plasma. Extended storage of plasma at room temperature resulted in degradation of lipids already after 1 day. Serum clotting at room temperature generally resulted in higher metabolite concentration compared with serum clotting on ice.
authors.affiliation: Department of Pediatric Research, Oslo University Hospital, Oslo, Norway.
authors.forename: Benedicte
authors.initials: B
authors.lastname: Jørgenrud
authors.forename: Sirkku
authors.initials: S
authors.lastname: Jäntti
authors.forename: Ismo
authors.initials: I
authors.lastname: Mattila
authors.forename: Päivi
authors.initials: P
authors.lastname: Pöhö
authors.forename: Kjersti S
authors.initials: KS
authors.lastname: Rønningen
authors.forename: Hannele
authors.initials: H
authors.lastname: Yki-Järvinen
authors.forename: Matej
authors.initials: M
authors.lastname: Orešič
authors.forename: Tuulia
authors.initials: T
authors.lastname: Hyötyläinen
mesh_terms: D000328:Adult; D002853:Chromatography, Liquid / Q000379:methods*; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006801:Humans; D008055:Lipids / Q000032:analysis; D008297:Male; D055442:Metabolome; D055432:Metabolomics / Q000379:methods*; D008875:Middle Aged; D010949:Plasma / Q000737:chemistry*; D044967:Serum / Q000737:chemistry*; D013048:Specimen Handling / Q000379:methods*
chemical_list: D008055:Lipids