“…To immobilize salicylic acid, following the procedure shown in Figure 1, the top phase (ethyl lactate-rich) obtained with the longest tie-line of this ATPS was placed in a rotary evaporator for 24 h at 323.15 K. Afterward, an aqueous solution of choline bicarbonate (80 m%) was added to the flask in a stoichiometric proportion and left under stirring for 12 h at 313.15 K and 0.1 MPa. Choline bicarbonate was added, accounting for the syntheses of cholinium salicylate ([Ch]Sa) and cholinium citrate ([Ch]Cit), which allowed to immobilize the API as API-IL and to convert tripotassium citrate to an IL with known application in tooth bleaching 52 and in the research for postoperative ileus. 53 The reaction routes for the syntheses are listed in Figure 5.…”