Improved solid phase extraction for selective and efficient quantification of sunset yellow in different food samples using a novel molecularly imprinted polymer reinforced by Fe3O4@UiO-66-NH2

The overuse of synthetic dyes in food products has gradually increased in recent years, resulting food safety and human health has become a global issue. An innovative design of a magnetic molecularly imprinted polymer (Fe3O4@UiO-66-NH2@MIP) for efficient, fast, and selective determination of sunset yellow (SY) from different food products was described in this study. The absorption properties of Fe3O4@UiO-66-NH2@MIP were elucidated by adsorption kinetics, isotherms, reusability, and selectivity experiments. Because of the incorporation of porous Fe3O4@UiO-66-NH2 nanocomposite into molecularly imprinted polymer an efficient nanosorbent with a short equilibrium time, a high adsorption capacity, and a good imprinting factor was finally obtained. The porous Fe3O4@UiO-66-NH2@MIP are also used for quantification of the SY. Under optimal conditions, good linearity (R2 0.9964) in the range of 1.0-120 mg L-1 and a low limit of detection (0.41 mg L-1) was observed with satisfactory recoveries (92.50-106.1%) and excellent reusability (RSD <= 6.6% after 12 cycles).

Automated summary

This study presents an innovative design of a magnetic molecularly imprinted polymer for efficient, fast, and selective determination of sunset yellow in food products. By incorporating porous Fe3O4@UiO-66-NH2 nanocomposite into the molecularly imprinted polymer, an efficient nanosorbent with a short equilibrium time, high adsorption capacity, and good imprinting factor was obtained. The Fe3O4@UiO-66-NH2@MIP also showed good linearity, low detection limit, satisfactory recoveries, and excellent reusability for the quantification of sunset yellow.