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(a) Effect of spray solvent on the analysis of verapamil [(M+H)+, m/z 455, product ion, m/z 303] and (b) effect of isopropanol percentage in dichloromethane on the signal of verapamil with a triple quadrupole. Silica-coated paper substrate used. The peak intensity is an average of total ion chronogram values. The concentration of verapamil in the blood sample was 500 ng mL−1.
