Abstract
A glassy carbon electrode modified with hydrophobicity 1-n-butyl-3-methylimidazolium hexafluoro-phosphate([BMIM]PF6 /GCE) was fabricated. In a 0. 2 mol /L phosphate buffer solution( pH 4. 0 ～ 8. 0), cyclic voltammetry and differential pulse stripping voltammetry were used to investigate the electrochemical behavior of luteolin at the modified electrode and a new method for detection of luteolin was established. As a result,an improved response of luteolin at the modified electrode was observed with peak potential shift negatively and increase of peak current. An electrocatalytic quasi-reversible redox process of controlled by absorption was obtained for luteolin on the surface of the modified electrode in a potential range of - 0. 2 ～ 0. 7 V at pH = 7. 0. The charge transfer coefficient( α) and adsorbed amount( Γ) were calculated to be 0. 5 and 4. 6 × 10 -10 mol /cm2,respectively. The anodic current increased linearly with luteolin concentration in a range of 1. 0 × 10 -10 ～ 1. 6 × 10 -8 mol /L with a detection limit of 3. 2 × 10 -11 mol /L,and the recovery is between 98. 7% and 102. 0% . The method is simple,quick,accurate and reliable. It may provide a novel way for flavonoid determination in wild chrysanthemum flower.
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