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MALDI mass spectra of the samples (∼800 ng mL–1, 1.5 μL) containing (A) S. aureus, (B) E. faecalis, and (C) A. baumannii obtained before enrichment. (D–F) Corresponding mass spectra of the three bacterial samples (∼800 ng mL–1, 390 μL) obtained after enrichment by Eu3+. CHCA (20 mg mL–1) prepared in the solvent containing acetonitrile and 3% TFA (2:1, v/v) was used as the MALDI matrix.
