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Negative ionisation mode (-ve) ‘shotgun’ nESI-UHRAMS spectra of a crude non-derivatised lipid extract from E. coli grown under SGP conditions. The lower inset shows an expanded region (600–800 m/z) of the mass spectrum. The upper inset shows an expanded region (600–800 m/z) of the mass spectrum acquired using nESI-FAIMS-UHRAMS on the same sample.
