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International audienceThe goal of this study is to characterize the polyphenolics of the extracts from the skin of Punica granatum. L (pomegranate) and Quercus suber (cork oak). The measurements were performed quantitatively and complexing reactions with metals were characterized for use as sensors in aqueous solution. The qualitative analysis of these extracts by thin-layer chromatography reveals the presence of polyphenols in the extracts that was confirmed by the determination of total polyphenols. These analyses are complemented by high-performance liquid chromatography that shows that Punica granatum. L and Quercus suber are rich in bioactive compounds which affects their reactions with metals. Devices based on the components of the plants reveals high sensitivity and a linear relationship with cadmium ions. The lowest measured concentrations of cadmium were 10−10 M for the pomegranade extract and 10−9 M for the acorn extract

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2016): A new sensitive and selective sensor for heavy metal ions based on tannin extracted from the skin of ABSTRACTThis article presents the development of a sensor made from a gold electrode and a receiving polymeric membrane based on tannin extracted from the skin of Punica granatum. L (pomegranate) for real-time detection of heavy metals in a hydrous environment. The basic principle of this device is the complexing (chelating) of metal ions through the adjacent hydroxyl groups contained in the chemical structures of the tannins. The electrochemical characterisation was performed by using electrochemical impedance spectroscopy and square wave voltammetry. Other morphological and structural analyses were performed by using Fourier transform infrared spectroscopy and atomic-force microscopy. The results obtained showed the high sensitivity of the developed device (detection limits of 6.35 × 10 −9 g L −1 for Cu 2+ , 1.1 × 10 −8 g L −1 for Cd 2+ and 2 × 10 −7 g L −1 for Pb 2+ ) and the possibility of simultaneously detecting several heavy metals, each one in a highly selective manner with highly acceptable response time (48s).

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