Abstract
We report fabrication of new generation nanoflowers (NFs) using gallic acid (GA) and copper (II) ions (Cu2+) acted as an organic and inorganic component, respectively with effective peroxidase mimic activities in solution and on filter membrane. Unlike the typical protein NFs synthesis mechanism, gallic acid NFs (GA-NFs) was formed via coordination reaction between carboxyl groups of GA and Cu2+. The different morphologies of the GA-NFs were acquired based upon whether the carboxyl groups in gallic acid are active or not. The peroxidase mimic activity of the GA-NFs relied on the Fenton reaction in the presence of hydrogen peroxide (H2O2) was tested towards m-cresol as a function of concentration of the GA-NFs, m-cresol, H2O2 and reaction time. Under the optimized conditions, the oxidative coupling of m-cresol with 4-aminoantipyrine (4-AAP) was catalyzed by the GA-NFs dispersed in solution and adsorbed on filter paper to form an antipyrine dye and it was visually and spectrophotometrically recorded. The m-cresol with range of 0.05–0.5 mM was detected in 10 min and 15 min by using the GA-NFs in solution and on filter paper, respectively. We demonstrated that the NFs can be produced from non-protein molecules and GA-NFs can be used as a promising nanocatalyst for a variety of applications.
Highlights
We report fabrication of new generation nanoflowers (NFs) using gallic acid (GA) and copper (II) ions (Cu2+) acted as an organic and inorganic component, respectively with effective peroxidase mimic activities in solution and on filter membrane
We present, for the first time, an inspirational work with fabrication of gallic acid incorporated nanoflower (GA-NFs) by exploiting coordination reaction occurred between carboxyl group of GA and Cu2+
The typical NFs synthesis procedure was applied that free GA was added into 10 mM phosphate buffer solution (PBS) solution containing C u2+, and the resulting mixture was left for incubation without disturbing
Summary
We report fabrication of new generation nanoflowers (NFs) using gallic acid (GA) and copper (II) ions (Cu2+) acted as an organic and inorganic component, respectively with effective peroxidase mimic activities in solution and on filter membrane. Unlike the typical protein NFs synthesis mechanism, gallic acid NFs (GA-NFs) was formed via coordination reaction between carboxyl groups of GA and Cu2+. The typical formation mechanism of proteins/enzymes-based NFs relies on forming complexes between amide groups of proteins/enzymes backbone and C u2+ ions in phosphate buffer solution (PBS). We report, for the first time, the synthesis of gallic acid-based NFs (GA-NFs) with effective peroxidase mimic catalytic activity for colorimetric and spectrophotometric detection of m-cresol. The same procedure was applied to GA-NFs immobilized filter membrane, the detection of m-cresol with same concentrations were accomplished in 15 min. Various parameters such as concentration of GA-NFs, H 2O2 and reaction time were investigated to optimize the detection of m-cresol in solution and on filter membrane
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