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(A) MALDI-MS spectrum using α-cyano-4-hydroxycinnamic acid as matrix and (B) SALDI-MS spectrum using polyacrylonitrile/Nafion®/carbon nanotube composite as substrate for the detection of verapamil (V), chlorprothixene (C), methotrimeprazine (M) and propranolol (P). (Reproduced with permission from Ref. [13]).
