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a Mass spectrum of PtdCho class standard used as calibrant for quantification. b Mass spectrum of the krill PtdCho class. Both spectra were obtained with NPLC/ESI–MS operated with negative mode ionization, and show [M + FA–H]− adduct ions. The mass spectra indicate a higher occurrence of long chained fatty acyl groups in PtdCho species originating from krill than in the PtdCho standard from egg yolk
