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(A) PSI-MS by the hydrophobic paper substrate, and (B) tandem MS analysis of drugs extracted from urine and blood. 3.9 ng/mL methamphetamine in blood and 3.9 ng/mL benzoylecgonine transitions in urine (Reprinted with permission65. Copyright 2016 American Chemical Society). (C) Comparison of mass spectra of several proteins by filter paper and PS-impregnated paper substrates-based PSI-MS (Reprinted with permission67. Copyright 2018 Royal Society of Chemistry).
