Study of the interaction of the bioactive compound saponin from Glycyrrhiza glabra with a carbon nanotube matrix

Saponins are bioactive compounds belonging to the secondary metabolism of plants widely used for their beneficial actions human health. In this work association saponin from Glycyrrhiza glabra with a matrix multi-walled carbon nanotubes was promoted obtain composite material improved functional characteristics. For investigation, chemically modified electrodes (CME) based on paste were developed. Firstly, electrode (CPE) addition (SAP) electrochemical optimization system, CPE/SAP, studies carried out using cyclic voltammetry. The determination parameters such as formal potential (Eo) and separation (?E) indicated that modifying agent generated favors transfer electrons even at low applied potentials. second step performed by preparing nanotube (CPE/CNT). This material, surprisingly, showed redox pair probably due presence iron atoms preparation method, something very purposes work. Next associated in order investigate behavior hybrid formed (CPE/SAP-CNT), which evidenced significant improvement electron process when interacts matrix, increasing anodic peak current more than 3.6 times relation CPE/SAP 2.1 compared CPE/CNT. Another important issue concerns stability systems, presenting significantly stability, being able be 8 hours or 200 voltammetric cycles loss signal only 2%, while 60% under same conditions use.