A Cascade Enzyme System Integrating Peroxidase Mimic with Catalase for Linear Range Expansion of H 2 O 2 Assay: A Mechanism and Application Study

Peroxidase (POD) Nanozyme-based hydrogen peroxide (H O ) detection is popular, but hardly adapt to high concentration of H O owing to narrow linear range (LR) and low LR maximum. Here, a solution of combining POD and catalase (CAT) is raised to expand the LR of H O assay via decomposing part of H O...

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Veröffentlicht in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2023-06, Vol.19 (25), p.e2300444
Hauptverfasser: Hou, Haiwei, Liu, Lan, Li, Qiuyue, Wang, Jianming, Du, Baoji
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container_start_page e2300444
container_title Small (Weinheim an der Bergstrasse, Germany)
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creator Hou, Haiwei
Liu, Lan
Li, Qiuyue
Wang, Jianming
Du, Baoji
description Peroxidase (POD) Nanozyme-based hydrogen peroxide (H O ) detection is popular, but hardly adapt to high concentration of H O owing to narrow linear range (LR) and low LR maximum. Here, a solution of combining POD and catalase (CAT) is raised to expand the LR of H O assay via decomposing part of H O . As a proof of concept, a cascade enzyme system (rGRC) is constructed by integrating ruthenium nanoparticles (RuNPs), CAT and graphene together. The rGRC-based sensor does perform an expanded LR and higher LR maximum for H O detection. Meanwhile, it is confirmed that LR expansion is closely associated with apparent K of rGRC, which is determined by the relative enzyme activity between CAT and POD both in theory and in experiment. At last, rGRC is successfully used to detect high concentration of H O (up to 10 mm) in contact lens care solution, which performs higher assay accuracy (close to 100% recovery at 10 mm of H O ) than traditional POD nanozymes. This study brings up a kind of POD/CAT cascade enzyme system and provides a new concept for accurate and facile H O detection. Additionally, it replenishes a new enzyme-substrate model of achieving the same pattern with competitive inhibition in enzyme reactions.
doi_str_mv 10.1002/smll.202300444
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subjects Catalase
Hydrogen Peroxide
Peroxidase
Peroxidases
title A Cascade Enzyme System Integrating Peroxidase Mimic with Catalase for Linear Range Expansion of H 2 O 2 Assay: A Mechanism and Application Study
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