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Surface-enhanced TM-DESI analysis of a 40 mL urine sample containing penicillamine (20 μM). The extracted ion chronogram of the collisionally induced dissociation product ion of m/z 217 is shown on the left, while MS2 and MS3 spectra for the captured sulfhydryl analyte are shown on the right. In this case, two mesh materials were submerged in the urine sample and analyzed as duplicates.
