Nazifi M, Ahmadi R, Ramezani AM, Absalan G. Introducing hierarchical hollow MnO
2 microspheres as nanozymes for colorimetric determination of captopril.
Anal Bioanal Chem 2021;
413:7063-7072. [PMID:
34622321 DOI:
10.1007/s00216-021-03672-2]
[Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/11/2021] [Accepted: 09/15/2021] [Indexed: 11/29/2022]
Abstract
A simple sensor was developed for the colorimetric determination of captopril (CPT). Herein, hierarchical hollow MnO2 microspheres (HH-MnO2) were applied as nanozymes with peroxidase-mimetic activity. Free cation radicals with a strong absorption signal (λmax at 653 nm) were generated via a redox reaction between 3, 3', 5, 5'-tetramethylbenzidine (TMB) and HH-MnO2. Captopril could successfully prevent the generation of blue-colored free cation radicals. The influence of CPT concentration on the absorption of the generated radicals was monitored by UV-Vis spectroscopy. The corresponding linear concentration range was from 1.0 to 30.0 μg mL-1 (4.6-138.1 μmol L-1), and the detection limit was found to be 0.26 μg mL-1 (1.2 μmol L-1). As a practical usage, the developed sensor was effectively utilized to measure the content of CPT in pharmaceutical formulations.
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