Construction of Aggregation-Induced Emission Molecule-MnO Composite Nanoprobe and Its Application in Alkaline Phosphatase Detection

Overview

Journal Nanomaterials (Basel)

Date 2023 Jul 29

PMID 37513149

Authors

Yanyun Cui

Jun Zhao

Huidan Li

Affiliations

Soon will be listed here.

Abstract

Alkaline phosphatase (ALP) is among the most studied enzymes by far, playing an important role in the metabolism of organisms and the regulation of protein activity. Herein, a label-free composite nanoprobe is constructed by combining inorganic nanomaterials and aggregation-induced emission (AIE) molecule to achieve highly sensitive and selective detection of ALP. Negatively charged 9,10-bis [2-(6-sulfonatopropoxyl) naphthylethenyl] anthracene (BSNVA) molecule is synthesized, which has the AIE performance and can be assembled on the surface of amino-SiO nanoparticles through electrostatic interaction for fluorescence enhancement. MnO nanosheets are rich in negative charges, enabling them to be wrapped on the surface of the amino-SiO nanosphere to shield the positive charge on its surface, making it impossible for BSNVA to accumulate on the surface and then weakening the bio-fluorescence of the system. Furthermore, with catalyzed substrates induced by ALP, generating ascorbic acid and the redox reaction between ascorbic acid and MnO, the nanoprobe helps in realizing the high-sensitivity detection of ALP with a detection limit of 0.38 mU/mL. The proposed strategy requires no complex cleaning and modification processes and can overcome the quenching effect caused by the aggregation of traditional organic dyes, proving to be a simple, low-cost and "turn-on" fluorescent detection method for ALP.

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