中文摘要：

研究了黄芩素（baicalein,缩写BAI）在玻碳电极（GCE）与聚-L-赖氨酸修饰的玻碳电极（PLL/GCE）上的电化学行为.发现BAI不能在裸玻碳电极上产生明显的氧化还原信号,但在PLL/GCE上有一对可逆性较好的氧化还原峰出现.在最佳实验条件下,氧化峰电流与BAI的浓度在5.0×10^-7～1.0×10^-5mol/L范围内呈良好的线性关系,相关系数R为0.998,BAI检测限为4.8×10^-8mol/L（信号与噪声比S/N=3）.配10份相同浓度溶液,每次测定后需重新修饰电极,连续测定10次,所得结果的相对标准偏差（RSD）为4.3%,平均峰电流为1.48μA.这表明修饰电极具有良好的重现性.将该方法用于BAI在尿样中的回收率分析,结果令人满意.

英文摘要：

The electrochemical behavior of baicalein （BAI） was investigated at a glass carbon electrode （GCE） and a poly-L-lysine modified glass carbon electrode （PLL/GCE）. The result showed that a pair of reversible redox peaks that did not emerge at GCE was observed at PLL/GCE, which indicated that PLL/GCE performed effective electrochemical response to BAI. Under optimal conditions, a good linear relationship between the anodic peak current and concentration was obtained in the range of 5.0× 10^-7 -1.0× 10^-5 mol/L with the detection limit of 4.8 × 10^-8 mol/L, （S/N=3）. The responses of repeated measurements at the renewed surface of the PLL/GCE were examined with relative standard deviation of 4.3% （n= 10）, respectively, indicating that the chemically modified electrode showed excellent reproducibility. The proposed method has been used to determine baicalein concentration in urine samples with satisfactory results.