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MALDI-TOF mass spectra (positive mode) with proposed cleavages and the corresponding fragment masses for IL type surfactants (A) undecenoxy carbonyl-L-leucinol bromide (L-UCLB) and (B) undecenoxy carbonyl-L-pryrrolidinol bromide (L-UCPB) after freeze drying on a lyophilizer at −50 °C collector temperature and 0.05 mbar pressure for 14 days. The mass spectra were obtained using α-cyano-4-hydroxycinnamic acid as MALDI-matrix.
