用循环伏安法（CV）于磷酸盐缓冲溶液中在-0.8~1.6 V电位间扫描15周，使溴百里酚蓝（BTB）聚合于玻碳电极表面，制得BTB/GCE电极。另取经羰基化的多壁碳纳米管10 mg分散于10 mL DMF中，并将此分散液适量滴于BTB/GCE电极表面，于红外灯中烘干后即得MWCNTS/BTB/GCE修饰电极，用于测定冬虫夏草中腺嘌呤含量的传感器。通过CV研究表明：该传感器在pH 6.8的磷酸盐缓冲溶液中，扫描速率为100 mV·s^-1的条件下对腺嘌呤的响应明显，且腺嘌呤的质量浓度在0.05~1.0 g·L^-1范围内与相应的氧化峰电流呈线性关系，其检出限（3s）为0.025 g·L^-1。该方法用于5个不同批次的样品的分析，测得腺嘌呤含量与其标示量相符，测定值的相对标准偏差（n=5）在0.8%~2.0%之间。

Bromothymol blue (BTB) was polymerized on the surface of GCE in a phosphate buffer solution by CV in the potential range of -0.8 to 1.6 V, with scanning for 15 cycles, to form BTB modified GCE. A portion of 10 mg of carbonylated MWCNTS was dispersed in 10 mL of DMF, and an appropriate amount of the dispersion was dropped on the surface of the BTB/GCE, forming the modified electrode of MWCNTS/BTB/GCE, which was dried under ultra-red lamp. As shown by the CV study, significant response of adenine at the MWCNTS/BTB/GCE was observed in phosphate buffer at pH 6.8 with scanning rate of 100 mV·s^-1. It was proved that the modified GCE was suitable to be used as a sensor for CV determination of adenine in Cordyceps sinensis. Linear relationship between values of oxidative peak current and mass concentration of adenine was obtained in the range of 0.05-1.0 g·L^-1, with detection limit (3s) of 0.025 g·L^-1. 5 samples taken from different batches were taken and analyzed by the proposed method, giving results in consistency with the labelled values. Values of RSDs (n=5) found were in the range of 0.8%-2.0%.