Abstract

Identification of multiple antibiotics is of great interest owing to the requirement of food safety and pollution control in environment. Herein, a multicolor luminescent sensor (GT-GC) was designed based on an infinite coordination polymer (GT) formed by guanosine monophosphate (GMP) and lanthanoid ions Tb3+ as host matrix, and in-situ formed copper nanoclusters (CuNCs, GC) formed by glutathione and Cu2+ as guest species. TEM and SEM images showed that CuNCs further aggregated under the host-guest interaction. As a result, the as-prepared GT-GC not only emit characteristic luminescence of Tb3+ at 490, 544, 586 and 620 nm, but also emit the luminescence of CuNCs at 631 nm due to AIE effect. In addition, including the intrinsic luminescence of antibiotics in GT-GC at about 439 nm, the GT-GC exhibits 6-channel luminescence originated from three luminescence centers of Tb3+, CuNCs and antibiotics. In this work, 26 antibiotics were well identified based on the luminescence responses of the GT-GC and consequent linear discrimination analysis (LDA). The unknown antibiotics in real samples were also successfully identified. Due to the multi-color variation of GT-GC upon the addition of antibiotics, the visual on-site rapid detection of antibiotics was realized by a smartphone installed color recognition program.

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