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Effect of different ionic liquids on the separation of the seven antibiotics studied. Mobile phase: 10 mmol/L ammonium acetate at pH 3.0 with 13% (v/v) acetonitrile and (a) 6 mmol/L [Et4N][BF4]; (b) 6 mmol/L [EMIM][BF4]; (c) 6 mmol/L [BMIM][BF4]; (d) 6 mmol/L [HMIM][BF4]; (e) 6 mmol/L [MOIM][BF4]. Flow rate: 1 mL/min. Detection: λexc=280 nm and λem=450 nm. Peak identification: 1, FLERO; 2, CIPRO; 3, LOME; 4, DANO; 5, ENRO; 6, SARA and 7, DIFLO [74].
