Bisimidazole ionic liquid functionalized ZIF-8 solid-phase extraction coupled with high performance liquid chromatography for analysis Rhodamine B in food samples

An effective method based on the bisimidazole ionic liquid functionalized ZIF-8 solid-phase extractant (ZIF-8@MIM-MIM) coupled with high performance liquid chromatography (HPLC) for the separation/analysis of Rhodamine B was established. ZIF-8@MIM-MIM was characterized by FTIR, XRD, SEM and TEM. Several important factors, such as pH, amount of extractant, extract time and types of eluents were investigated in detail. Under the optimal conditions, linear range of the method was 0.02-40.00 µg mL − 1 , the detection limit was 7.0 ng mL − 1 , and the linear correlation was good (R 2  = 0.9986). The detection of Rhodamine B in chili powder, red wine, plum juice and strawberry jam proved that the method was simple and effective, and could be used to separate and analyze Rhodamine B in real samples.