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Cyclic voltammograms registered using four different carbon paste electrodes (CPEs) immersed in liqueur samples made from different varieties of apples. (a) Unmodified CPE; (b) ZnPc–CPE; (c) FePc–CPE; (d) CoPc–CPE. Apple varieties: Ligol (black), Kosztela (red), Grey Reinette (blue), Rubin (green), Cox Orange (purple). Reproduced from [43].
