Estimation of Ion Competition via Correlated Responsivity Offset in Linear Ion Trap Mass Spectrometry Analysis: Theory and Practical Use in the Analysis of Cyanobacterial Hepatotoxin Microcystin-LR in Extracts of Food Additives
Total ion chromatogram (TIC) of pure MCYST-LR (10 μg/mL) and its spectrum (below) in peak maximal intensity for a retention time of 17.09 min. In the spectrum, the molecular ion at a m/z 995 [M + H]+, the doubly charged sodium adduct ion at a m/z 509 [M + H + Na]2+, and the molecular ion with cleavage of the Adda moiety at a m/z 861 [M + 2H − 135]+ can be observed. The plot was obtained using EMP (Expertomica metabolite profiling) software. The position of the labels is given by the software.