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MALDI-TOF-MS Spectra of a PEP extract of urine (A) and of a matrix (CCA) blank (B). For A, 1.8 L of urine was extracted with a PEP containing 2.0 g of MP-adsorbent; then 5 mg of the washed, dried, and re-homogenized adsorbent was eluted with 40% aqueous acetonitrile containing triethylammonium acetate followed by combination of an aliquot of the supernatant after centrifugation with MALDI matrix. Insets: higher sensitivity setting.
