Keywords Electrochemical quartz crystal microbalance;Charge-transfer complex;o-Tolidine;Assay of chondroitin sulfate;Dynamically renewed surface of the electrode;

• 电化学石英晶体微天平;电荷转移配合物;邻联甲苯胺;硫酸软骨素分析;电极表面动态更新;