Unknown peaks in GC-MS analyses of Guthrie cards blood samples might be the result of sample contamination by the black markings of the card.
Azelaic acid, sometimes found during analysis of Guthrie card blood samples, may be derived from the printing ink used to mark the spotting area.
Brune
T G
TG
Department of Pediatrics, Otto-von-Guericke University, Magdeburg, Germany. thomas.brune@medizin.uni-magdeburg.de
Lambrecht
A Ch
ACh
Koch
H G
HG
D003998:Dicarboxylic Acids / Q000652:urine*; D005189:False Positive Reactions; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007231:Infant, Newborn; D008661:Metabolism, Inborn Errors / Q000652:urine*; D015997:Neonatal Screening; D011933:Reagent Kits, Diagnostic
D003998:Dicarboxylic Acids; D011933:Reagent Kits, Diagnostic; C010038:azelaic acid