“…However, the few methods currently proposed for FQ determination in vegetable matrices make use of prolonged extraction steps, mainly by ultrasound-assisted extraction (UAE) [ 9 , 10 , 12 , 20 ] and QuEChERS [ 2 , 15 , 21 ], by means of organic solvents such as acetonitrile (ACN), methanol (MeOH), acetone, hexane and chloroform. After the extraction, a cleanup step is usually performed, mostly by on-column solid-phase extraction (SPE) [ 9 , 12 , 18 , 19 ], dispersive SPE (d-SPE) [ 2 , 10 , 15 , 21 ] and liquid-liquid extraction (LLE) [ 20 ], which also require great amounts of organic solvents or sorbent material.…”