Glassy carbon electrode modified with luteolin extracted from Myoporum bontioides: a new approach for development of the electrochemical Cu2+ sensor

Recent surveys have described how many extracted compounds from various plants have electrochemical activity, which can be directly applied for development of electrochemical sensors. In this work, we propose using of luteolin, a natural compound was extracted and isolated from Myoporum bontioides leaves, as a monomer for electrochemical polymerization onto glassy carbon electrode (GCE) surface and synthesized polyluteolin (polyLut) modified GCE (polyLut/GCE) can be used for directly electrochemical detection of copper ion (Cu2+) in aqueous solution. The electrochemical properties of luteolin and polyLut/GCE in sodium acetate (NaAc–HAc) buffer with presence/absence of Ni2+, Ca2+, Co2+ or Cu2+ ion have evaluated and obtained results indicated that the luteolin and polyLut/GCE were selective and sensitive to Cu2+ ion. The electrochemical Cu2+ sensor based on polyLut/GCE has the sensitivity to Cu2+ ion of 0.751 μA μM−1 with limit of detection of 5 μM of Cu2+ ion, which is lower than of EU’s drinking water standards EU’s drinking water standards as 31.25 μM.