Volume 54, August 2015, Pages 181–187
Voltammetry pulse array developed to determine the antioxidant activity of camu–camu (Myrciaria dubia (H.B.K.) McVaug) and tumbo (Passiflora mollisima (Kunth) L.H. Bailey) juices employing voltammetric electronic tongues
Highlights
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- Camu–camu and tumbo, two tropical fruits rich on vitamin C.
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- Antioxidant capacity of fruits is expressed depending on the method used.
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- Cyclic voltammetry characterizes electrochemical processes (oxidation-reduction).
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- Pulse voltammetric tongue is based on a set of sensors (metallic electrodes).
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- Voltammetric electronic tongues can predict the antioxidant capacity of some fruits.
Abstract
A
pulse voltammetry electronic tongue can be a useful tool for
determining the antioxidant capacity of fruit extract with minimum
handling given the large number of electrodes it has. However, it is
necessary to define the array of pulses to be applied to each electrode
in order to obtain a pattern that characterize this property. In this
study, from a generic array of 22 pulses (applying potentials
between −800 and 900 mV for 20 ms each) and by employing statistical
procedures (multivariate analysis), the best arrays of pulses has been
defined to determine the antioxidant capacity of two Peruvian fruits
(camu–camu and tumbo) for each electrode to constitute the pulse
voltammetry electronic tongue (Au, Pt, Ir, Rh, Ag, Cu, Ni, and Co).
Three arrays were obtained, one employing all 22 pulses applied to each
electrode, which generated a large number of data, and two in which
pulses and electrodes were reduced. Accordingly, the best one only used
3.4% of the initial voltammetry information, obtained from pulses at 900
and −850 mV and applied to electrodes Ir and Au, and another at −600 mV
on an Ni electrode.
Keywords
- Pulse voltammetry;
- Ascorbic acid;
- Camu–camu;
- Tumbo;
- Electronic tongues
- Corresponding author. Tel.:
+34 96 3877362; fax: +34 96 3877369.
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