کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5009468 1462048 2017 8 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Facile synthesis of iridium nanoparticles with superior peroxidase-like activity for colorimetric determination of H2O2 and xanthine
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موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Facile synthesis of iridium nanoparticles with superior peroxidase-like activity for colorimetric determination of H2O2 and xanthine
چکیده انگلیسی


- The Ir NPs were rapidly prepared using tannin acid as stabilizer in one-pot reaction.
- The Ir NPs showed excellent peroxidase-like activity.
- The catalytic mechanism of the Ir NPs was verified by ESR assay.
- Different peroxide substrates were used for judging the catalytic mechanism of the Ir NPs.
- The Ir NPs were successfully used for the colorimetric determination of H2O2 and xanthine.

A facile and efficient method was developed for the preparation of iridium nanoparticles (Ir NPs) with superior peroxidase-like activity. Under the catalytic action of the Ir NPs, the peroxidase substrate 3,3,5,5-tetramathylbenzidine (TMB) can be oxidized by H2O2 to form a blue-colored production oxTMB. Kinetic analysis indicated that the catalytic behavior was in accordance with the typical Michaelis-Menten kinetics and the catalytic reaction followed the ping-pang mechanism. Electron Spin Resonance (ESR) experiment showed that no hydroxyl radical formed in the reaction process. Peroxide substrates with different electron withdrawing ability (benzoyl peroxide, H2O2 and artemisinin) were used to study the catalytic reactions and results indicated that H2O2 can oxidize TMB with much faster rate than artemisinin and slower rate than benzoyl peroxide. These results suggest an electron transfer mechanism was involved in the system of TMB-H2O2-Ir NPs. By using TMB as the colorimetric substrate, H2O2 can be rapidly determined and the method was extended for the determination of xanthine based on its production of H2O2 in the presence of xanthine oxidase. The prepared Ir NPs exhibit good stability in wide range of pH and temperature. The Ir NPs retained at least 90% of their initial catalytic activity after stored at ambient temperature for three months. The high specificity for H2O2 and the excellent stability of the peroxidase-like Ir NPs showed the great application potential in biotechnology field.

Iridium nanoparticles (Ir NPs) peroxidase-like mimic was prepared using nature stabilizer tannin acid with one-pot production in aqueous solution. Based on the electron transfer mechanism, the Ir NPs can be used for the catalytically oxidizing of TMB with H2O2 to form blue oxTMB.96

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 243, May 2017, Pages 203-210
نویسندگان
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