Novel cobalt-based metal-organic frameworks with superior catalytic performance on N-(4-aminobutyl)-N-ethylisoluminol chemiluminescent reaction

Novel cobalt-based metal-organic frameworks (Co MOFs) were synthesized by a facile controlled synthesis strategy. The MOFs displayed superior catalytic performance on the chemiluminescent (CL) reaction between N-(4-aminobutyl)-N-ethylisoluminol (ABEL) and H2O2. UV-vis absorption, CL spectrum, ESR, and radical scavenger experiments were conducted for clarifying the catalytic mechanism of Co MOFs. All results revealed that Co MOFs can accelerate decomposition of H2O2 and production of OH center dot, O-2(center dot-) as well as O-1(2) radicals. The rapid reaction between these reactive oxygen species and ABEL resulted in the generation of ABEI-ox*. The excited-state oxidation product emitted a very intensive CL signal with a maximal emission wavelength of 430 nm as it returned to the ground state. To explore their application potential in CL assay, Co MOFs were used as powerful CL reaction catalyst for establishing a very sensitive method for immunoassay of aflatoxin B-1. The detection range was 0.05-60 ng mL(-1), and the limit of detection was 4.3 pg mL(-1). The result for detecting herbal medicine samples demonstrates the acceptable reliability of the Co MOFs-based CL immunoassay. The proof-of-principle work verifies the application potential of Co MOFs on boosting intensive CL signal, and meets the demand for high sensitivity in various bioassay fields. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

Novel cobalt-based metal-organic frameworks (Co MOFs) were synthesized and showed superior catalytic performance in the chemiluminescent (CL) reaction. The Co MOFs accelerated the decomposition of H2O2 and production of oxygen radicals, leading to a sensitive method for immunoassay of aflatoxin B-1. The results demonstrated the reliability of Co MOFs-based CL immunoassay for detecting herbal medicine samples.