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Honeycomb-like nitrogen-doped porous carbon supporting Pt nanoparticles as enzyme mimic for colorimetric detection of cholesterol

Author:
Shi, Weijie   Fan, Hai   Ai, Shiyun   Zhu, Lusheng  


Journal:
Sensors and Actuators B: Chemical


Issue Date:
2015


Abstract(summary):

Abstract

Lignin obtained from black liquor had been successfully used as a precursor to prepare honeycomb-like nitrogen-doped porous carbon (PCN) assisted with urea. Then Pt nanoparticles were uniformly dispersed on honeycomb-like PCN by glycol reduction to form Pt nanoparticles supported on PCN (Pt/PCN). The obtained Pt/PCN was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), which showed that Pt nanoparticles with an average size of 4 nm were uniformly dispersed on the surface of honeycomb-like PCN. The prepared Pt/PCN was found to have much higher catalytic activity than individual Pt nanoparticles and PCN, which can catalyze oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2 to produce a blue color reaction, the detection limit of H2O2 can be reached to 1.7 × 10−6 M. Therefore, a rapid, selective and sensitive colorimetric method for the cholesterol detection was developed with the detection limit of 8.3 × 10−6 M. The method used lignin as the main raw material to prepare Pt/PCN is facile, low cost and rich in resource, and the prepared Pt/PCN is successfully applied as enzyme mimic for colorimetric detection of cholesterol sensitively. It is believed that this work not only provides a potential way to utilize the black-liquor lignin, but also puts forward a novel method for the detection of cholesterol in human body.



Page:
S0925400515300289


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