The electrochemical behavior of morin at a multi-walled carbon nanotubes-paraffin oil paste electrode (CNTPE) has been studied. Morin can cause a sensitive anodic peak at 0.52 V (vs. SCE) in 0.10 M phosphate buffer (pH=2.0), which results from a 2e transfer, accompanied by two protons transfer. The electrochemical process is irreversible and adsorption-controlled. For voltammetric determination of morin the parameters influencing the anodic peak, such as pH, accumulation potential and accumulation time have been optimized. Under the selected conditions, the anodic peak current is linear to morin concentration in the range of 5.0×10-9 to 1.0×10-7 M, and the detection limit is 1.0×10-9 M. This method has been applied to the determination of morin in Chinese traditional medicine Glycyrrhiza, and the recovery is 97.0~100.5%. Experimental results reveal that the CNTPE has advantages of small background current, high signal to background current ratio and good reproducibility.
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