Two nine-element sensor arrays, consisting of either three cationic poly(para-phenyleneethynylene)s (PPE) or the same PPEs complexed by cucurbituril[8] (CB[8]) at pH 3, 7, and 13 in water, discriminate 22 different teas and some of their small molecule components, including caffeine, theobromine and theophylline. Both arrays distinguish all of the black, green and oolong teas. The discrimination occurs by differential fluorescence modulation of the components of the sensor array and the treatment of the collected data by linear discriminant analysis. The signal is generated by either simple quenching (PPE only array) or the disruption of the PPE/CB[8] complex and quenching of the complex’s or the PPEs’ fluorescence through the polyphenolic colorants of the teas. Added amino acids, theobromine, theophylline, and caffeine give a fluorescence turn on of the PPE-CB[8] array, due to the disruption of the self-assembled complex, while for the PPE-alone tongue only caffeine, theobromine, and theophylline elicited useful fluorescence response. Both tongues discriminate different teas without any problem.

中文翻译：

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聚（对-亚苯基乙炔基）传感器阵列可区分22种不同的茶

两个九元素传感器阵列，由三个阳离子聚（对-苯撑乙炔撑（PPE）或与葫芦素[8]（CB [8]）在水中的pH值为3、7和13络合的相同PPE可以区分22种不同的茶及其一些小分子成分，包括咖啡因，可可碱和茶碱。两种排列方式可以区分所有黑茶，绿茶和乌龙茶。通过对传感器阵列的组件进行差分荧光调制以及通过线性判别分析处理收集到的数据来进行区分。通过简单的淬灭（仅PPE阵列）或PPE / CB [8]复合物的破坏，以及通过茶中的多酚类着色剂淬灭复合物或PPE的荧光来产生信号。由于自组装复合物的破坏，添加的氨基酸，可可碱，茶碱和咖啡因使PPE-CB [8]阵列发出荧光，而对于仅使用PPE的舌头，仅咖啡因，可可碱和茶碱会引起有用的荧光反应。两种舌头都可以毫无区别地辨别不同的茶。