Figure 4:
The mass spectra of calibration mixtures (23.8a, 59.6b, 119.0c, 1190.0d and 2380.0e ng mL
-1
)of amantadine (analyte) and memantine, 2380.0 ng mL
-1
(IS), in 50% aqueous solution of acetonitrile containing 0.1% formic acid.
