A Novel Electrochemical Sensing Strategy for Rapid and Ultrasensitive Detection of 6-Benzylaminopurine in Sprout Vegetab
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A Novel Electrochemical Sensing Strategy for Rapid and Ultrasensitive Detection of 6-Benzylaminopurine in Sprout Vegetables by Hollow Core/Shell-Structured CuO@SiO2 Microspheres Tian Gan & Zhaoxia Shi & Ning Liu & Zhen Lv & Junyong Sun & Haibo Wang
Received: 8 December 2014 / Accepted: 24 February 2015 # Springer Science+Business Media New York 2015
Abstract A facile synthesis of hollow core/shell-structured CuO@SiO 2 microspheres with uniform size and welldefined morphology is demonstrated. Electrochemical measurement results prove that the as synthesized CuO@SiO2 microspheres exhibit superior electrocatalytic activity toward the determination of 6-Benzylaminopurine (6-BA). Based on this, a simple and rapid electrochemical sensing strategy has been successfully constructed for the detection of 6-BA, which exhibits high sensitivity and good reproducibility. The peak current of 6-BA increases linearly with its concentration in the range of 50 nM~100 μM, and the detection limit is 2.6 nM. In addition, the practical analytical application of the sensing platform is assessed by determination of 6-BA in real sport vegetables with satisfactory results. Armed with the remarkable advantages, such as ease of use, low analyte consumption, inexpensive cost, and fast response time, the electrochemical sensing strategy may hold great potential for the in-field food safety monitoring. Keywords 6-Benzylaminopurine . CuO . SiO2 . Core/shell . Hollow . Electrochemical sensing
Introduction The pesticides, including plant growth regulators, herbicides, insecticides, and fungicides, are potentially hazardous T. Gan (*) : Z. Shi : N. Liu : Z. Lv : J. Sun : H. Wang College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China e-mail: [email protected]
chemicals in food products for human consumption, which remain a major concern in the European Community because of their serious health consequences (El-Shahawi et al. 2010; Alves et al. 2014). As such, a topical task of modern analytical chemistry is analysis of pesticides in complex specimens aimed at gaining objective information on a real-time basis. This is related to the existing food safety requirements associated with frequent occurrence of poisonous and harmful agricultural products (Chao and Chen 2014; Suryoprabowo et al. 2014). Therefore, it is essential and beneficial to develop a reliable method for the rapid and accurate detection of pesticides in order to regulate the use and avoid the potential abuse of pesticides by consumers. Amongst commercial pesticides, 6-benzylaminopurine (6BA), as the first-generation synthetic cytokinin, has received a great deal of attention in recent decades due to its increasing application in plant culture (Perilli et al. 2010). 6-BA can enhance the ability of scavenging blade intracellular-free radicals, inhibit peroxidation of membrane lipids, and delay senescence of blades by influencing metabolic processes of protein, lipids, and pigments (Qiao et al. 2014; Pan et al. 1999). It is also increasingly used t
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