中文摘要：

研究β,β-二甲基丙烯酰阿卡宁（β,β-dimethyl-acry-1alkannin，简称卢β,β-DAL）的电化学行为并由差示脉冲伏安法测定其含量．实验表明：β,β-DAL在玻碳电极上具有明显的吸附性，其电极反应是一可逆的双电子双质子过程．在pH4．6的磷酸盐缓冲溶液中，＋0．8～-0．4V电位区间内，β,β-DAL的差示脉冲还原峰电流（lp）与其浓度（c）呈良好的线性关系，浓度范围1．3×10^-7～-1．7×10^-6mol／L（r=0．9996），检出限4．0×10^-8mol／L．本方法灵敏度高、重现性好，用于中药紫草中β,β-DAL的含量测定，结果满意．

英文摘要：

The electrochemical behavior of the β,β-dimethyl-acry,-lalkannin and a novel differential pulse volta- mmetric method for the determination of the β,β-DAL content were studied. Experiments indicated that the β,β-DAL has excellent adsorbability and the electrochemical reaction is a reversible two-electro and two- proton process. In phosphate buffer solution （ pH 4.6）, the differential pulse voltammograms for β,β-DAL reduction signals from ＋ 0.8 - - 0.4 V were monitored . The relationship between reduction peak current and concentration of β,β-DAL is linear in the range of 1.3 x 10^-7 - 1.7 x 10^-6 moL/L（ r =0. 9996）. The detection limit is 4.0 x 10-SmoL/L. This method is sensitive and reliable for the determination of the β,β-DAL in radix with satis- factory results.