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 MCYST-LR (0.01 μg/mL) in Stigeoclonium sp. extract and its spectrum (below) in peak maximal intensity at a retention time of 17.08 min. In the noisy spectrum, the molecular ion of m/z 995 [M + H]+, the sodium adduct ion of m/z 509 [M + H + Na]2+, and the molecular ion with the cleavage of the Adda moiety at an m/z 861 [M + 2H − 135]+ are still observed. The plot was taken from EMP (Expertomica metabolite profiling) software. The position of the labels is given by the software.