New Ultralow-Cost Telemetric System for a Rapid Electrochemical Detection of Vitamin C in Fresh Orange Juice

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• 作者：Antonio Barberis ; Gianfranco Bazzu ; Giammario Calia ; Giulia M. G. Puggioni ; Gaia G. Rocchitta ; Rossana Migheli ; Mario Schirra ; Maria Speranza Desole ; Pier Andrea Serra
• 刊名：Analytical Chemistry
• 出版年：2010
• 出版时间：June 15, 2010
• 年：2010
• 卷：82
• 期：12
• 页码：5134-5140
• 全文大小：243K
• 年卷期：v.82,no.12(June 15, 2010)
• ISSN：1520-6882

文摘

Ascorbic acid (AA), one of the principal micronutrients in horticultural crops, plays a key role in the human metabolism, and its determination in food products has a great significance. Citrus fruits are rich in AA, but its content is highly susceptible to change during postharvest processing and storage. We present a new ultralow-cost system, constituted of an amperometric microsensor composed of three rod carbon electrodes connected to a telemetric device, for online detection of AA in orange juice, as an alternative to conventional analytical methods. The in vitro calibration, ranged from 0 to 5 mM, and AA juice content was calculated by adding low volumes of sample into an acetate buffer solution at a constant potential of +120 mV vs carbon pseudoreference. This new approach, which is simple, expandable, and inexpensive, seems appropriate for large scale commercial use.