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a simple and sensitive method for the voltammetric analysis of theobromine in food samples using nanobiocomposite sensor
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نویسنده
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peng yingqiong ,zhang wenjuan ,chang juan ,huang yaoping ,chen li ,deng hong ,huang zhong ,wen yangping
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منبع
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food analytical methods - 2017 - دوره : 10 - شماره : 10 - صفحه:3375 -3384
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چکیده
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Theobromine (tb) is one of important natural methylxanthine alkaloids in plants and their products, but there were few reports on the electrochemistry of tb, especially electrochemical measurements using chemically modified electrode owing to its poor detectability. in this work, a simple and sensitive method for the voltammetric analysis of tb in green tea, chocolate, and coffee samples was successfully realized using nanobiohybrid sensor based on glassy carbon electrode (gce) modified by both carboxyl-functionalized multiwalled carbon nanotubes (fmwcnts) and soluble biopolymer sodium salt of carboxymethylcellulose (cmc). water-dispersible nanonbiohybrids with fmwcnts were successfully prepared using cmc assist, and cmc-fmwcnts were characterized by scanning electron microscopy, fourier transform infrared spectroscopy, transmission electron microscope, electrochemical impedance spectroscopy, and cyclic voltammetry. cmc-fmwcnts/gce showed enlarged electrochemically active surface area, good electrode stability, and enhanced electrocatalytic activity. the voltammetric behavior of tb demonstrated an irreversible electrochemical oxidation reaction involving two electrons and two protons, which could detect tb in a wider linear range from 0.5 to 80 μm with a lower limit of detection (lod) of 0.21 μm. the developed method displayed a high sensitivity, low lod, good sensing stability, remarkable feasibility, and satisfactory practicality.
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کلیدواژه
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voltammetric sensor ,nanobiocomposite ,theobromine ,carbon nanotube ,carboxymethyl cellulose
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آدرس
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colleges and uuniversities of jiangxi province for key laboratory of information technology in agriculture, jiangxi agriculture university, people’s republic of china, colleges and uuniversities of jiangxi province for key laboratory of information technology in agriculture, jiangxi agriculture university, people’s republic of china. jiangxi agricultural university, institute of functional materials and agricultural applied chemistry, people’s republic of china, jiangxi agricultural university, institute of functional materials and agricultural applied chemistry, people’s republic of china, colleges and uuniversities of jiangxi province for key laboratory of information technology in agriculture, jiangxi agriculture university, people’s republic of china. jiangxi agricultural university, institute of functional materials and agricultural applied chemistry, people’s republic of china, jiangxi agricultural university, institute of functional materials and agricultural applied chemistry, people’s republic of china. ministry of education, jiangxi agricultural university, key laboratory of crop physiology, people’s republic of china, colleges and uuniversities of jiangxi province for key laboratory of information technology in agriculture, jiangxi agriculture university, people’s republic of china, jiangxi agricultural university, institute of functional materials and agricultural applied chemistry, people’s republic of china, jiangxi agricultural university, institute of functional materials and agricultural applied chemistry, people’s republic of china. ministry of education, jiangxi agricultural university, key laboratory of crop physiology, people’s republic of china
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Authors
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