One-pot synthesis of ternary-emission molecularly imprinted fluorescence sensor based on metal–organic framework for visual detection of chloramphenicol

In this paper, a ternary-emission fluorescence imprinted polymer was one-pot synthesized by sol–gel method after mixing luminescence metal organic framework, green CdTe and near infrared red CdTe for visual detection of chloramphenicol in food. The ternary-emission fluorescence imprinted sensor showed wider linear range within concentration of 10 pM–0.5 nM and 0.5 nM–4.5 nM, with rapid response time of 3 min and the lower detection limit of 3.8 pM toward chloramphenicol. Meanwhile, NH 2 -UiO-66 improved the fluorescence sensitivity and response speed, the near-infrared CdTe enhanced the anti-interference ability of the imprinted sensor. Compared with the traditional single-emission and dual-emission fluorescence imprinted sensors, the ternary-emission imprinted sensor provided richer color changes from yellowish green to apricot to orange-salmon to amaranth to purple to final blue. It was applied to detect trace chloramphenicol in food with the recoveries of 98.2–101.2 %, which provided a new way for rapid visual detection of chloramphenicol.