Simultaneous trace determination of acidic non-steroidal anti-inflammatory drugs in purified water, tap water, juice, soda and energy drink by hollow fiber-based liquid-phase microextraction and ultra-high pressure liquid chromatography coupled to tandem

► A two-phase HF-LPME procedure is optimized prior to UPLC-MS/MS analysis. ► 1-octanol was placed in the pores and lumen of hollow fiber as extractant. ► Determination of four NSAIDs in purified water, tap water, soda, juice, and energy drink.