It is (1+) and strongly present with high ACN content at the end of our LC gradients (Setup: Ultimate 3000RSLCnano HPLC coupled to an impactII MS running plant proteomics samples). Didn't find any information about such a mass - it is also present in blanks and we have already exchanged solvents to highest purity (Merck hypergrade ACN) which improves situation but the signal seems to return.

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