Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 412, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124407
Keywords
Ratiometric fluorescent detection; Arsenate; Nanozyme; Hemin; Acid phosphatase
Categories
Funding
- National Natural Science Foundation of China [21822807, 22078132, 21605061]
- Natural Science Foundation of Jiangsu Province [BK20170323, BK20170523]
- Postgraduate Research AMP
- Practice Innovation Program of Jiangsu Province [KYCX18_2275]
- Key Research and Development Program of Changzhou City [CE20195014]
- Innovation and Entrepreneurship Program of Jiangsu University [202010299129Y]
- Cultivation Project for Excellent Young Teachers of Jiangsu University [4111310004]
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A ratiometric fluorescent biosensor based on acid phosphatase and hemin loaded Zn-MOF was constructed for high-performance arsenate sensing, with high sensitivity and selectivity in detecting As(V).
Exploring high-performance sensors for toxic arsenic detection is highly desired because of its great threat to the environment. Herein, we report a ratiometric fluorescent biosensor based on acid phosphatase and hemin loaded multifunctional Zn-based metal?organic framework (ACP/hemin@Zn-MOF) for high-performance arsenate (As (V)) sensing. ACP/hemin@Zn-MOF is constructed by self-assembly, where hemin exhibits peroxidase-like activity and 2-aminoterephthalic acid ligand endows ACP/hemin@Zn-MOF with an intrinsic fluorescence (452 nm). When ACP/hemin@Zn-MOF catalyzes the oxidation of o-phenylenediamine (OPD), fluorescent 2,3-diaminophenazine (DAP) with an emission signal (564 nm) is produced and weakens ACP/hemin@Zn-MOF intrinsic fluorescence (452 nm) due to inner filter effect; after adding ascorbic acid 2-phosphate (AAP), ACP can hydrolyze AAP and produce ascorbic acid, which competitively suppresses the oxidation of OPD, resulting in the decrease of DAP signal (564 nm) and the recovery of ACP/hemin@Zn-MOF signal (452 nm); when As(V) is added, it irreversibly poisons ACP against hydrolyzing AAP, and the fluorescence signal at 564 nm recovers and the one at 452 nm is suppressed again. High-sensitivity and high-selectivity detection of As(V) (3.33?300 ?g L-1) is realized, with a detection limit of 1.05 ?g L-1. The biosensor was also successfully employed to detect total arsenic and As(V) in rice.
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