Barberis, Antonio and Bazzu, Gianfranco and Calia, Giammario and Puggioni, Giulia Maria Grazia and Rocchitta, Gaia Giovanna Maria and Migheli, Rossana and Schirra, Mario and Desole, Maria Speranza and Serra, Pier Andrea (2010) New ultralow-cost telemetric system for a rapid electrochemical detection of vitamin C in fresh orange juice. Analytical Chemistry, Vol. 82 (12), p. 5134-5140. ISSN 0003-2700. Article.
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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.
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