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    Article

    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.

    T. G. Brune, A. Ch. Lambrecht, H. G. Koch in Journal of Inherited Metabolic Disease (2002)