Ultrasensitive fluorometric determination of hydrogen peroxide and glucose by using multiferroic BiFeO₃ nanoparticles as a catalyst

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• 作者：Wei Luo ; Yu-Sang Li ; Jing Yuan ; Lihua Zhu ; Zhengdan Liu ; Heqing Tang ; Shusheng Liu
• 关键词：Hydrogen peroxide ; Glucose ; Catalysis ; BiFeO₃ ; Fluorometric ; Benzoic acid
• 刊名：Talanta
• 出版年：2010
• 出版时间：15 May 2010
• 年：2010
• 卷：81
• 期：3
• 页码：901-907
• 全文大小：666 K

文摘

BiFeO₃ magnetic nanoparticles (BFO MNPs) are used as a catalyst to develop an ultrasensitive method for the determination of H₂O₂. It is found that BFO MNPs can catalyze the decomposition of H₂O₂ to produce OH radicals, which in turn oxidize the weakly fluorescent benzoic acid to a strongly fluorescent hydroxylated product with a maximum emission at 405 nm. This makes it possible to sensitively quantify traces of H₂O₂. Under optimized conditions, the fluorescence intensity is observed to be well linearly correlated with H₂O₂ concentration from 2.0 × 10⁻⁸ to 2.0 × 10⁻⁵ mol L⁻¹ with a detection limit of 4.5 × 10⁻⁹ mol L⁻¹ (S/N = 3). In addition, a selective method for glucose determination is developed by using both glucose oxidase and BFO MNPs, which has a linear range for glucose concentration from 1.0 × 10⁻⁶ to 1.0 × 10⁻⁴ mol L⁻¹ with a detection limit of 5.0 × 10⁻⁷ mol L⁻¹. These new methods have been successfully applied for the determination of H₂O₂ in rainwater and glucose in human serum samples.