Organisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany.
Versuchs- und Lehranstalt für Brauerei in Berlin (VLB) e.V., Research Institute for Beer and Beverage, Seestrasse 13, 13353, Berlin, Germany.
Chemistry. 2018 Nov 22;24(65):17361-17366. doi: 10.1002/chem.201804607. Epub 2018 Oct 30.
A hypothesis-free sensor array (optoelectronic tongue) composed of an anionic, a cationic and two neutral poly(para-aryleneethynylene)s (PAE) at pH 3, 7 and 13 discriminate more than 30 spirits (including brandy, Branntwein, Cognac, Spirituose, and Weinbrand). Counterfeits (made by mixing of low-quality spirits and caramel colour) and different batches of identical brands of brandies are discriminated. The sensor array works without sample preparation or great instrumental cost, and is superior to conventional methods with respect to sample need (10-20 μL), time and effort. The discrimination stems from differential fluorescence quenching of the PAE-array by the complex mixture of the beverages' colourants, from the oak barrels or added caramel colour. The collected quenching data were analysed by linear discriminant analysis (LDA) and principal component analysis (PCA) to achieve successful discrimination.
一种无假设的传感器阵列（光电舌）由阴离子、阳离子和两种中性聚（对-芳基乙炔）在 pH 3、7 和 13 下组成，可以区分 30 多种烈酒（包括白兰地、Branntwein、干邑、烈酒和 Weinbrand）。假酒（由低质量的烈酒和焦糖色素混合而成）和不同批次的相同品牌的白兰地也可以被区分。该传感器阵列无需样品制备或昂贵的仪器即可工作，与传统方法相比，它在样品需求（10-20μL）、时间和精力方面具有优势。这种区分源于饮料着色剂的复杂混合物对 PAE 阵列的荧光猝灭，以及来自橡木桶或添加的焦糖色素。通过线性判别分析（LDA）和主成分分析（PCA）对收集到的猝灭数据进行分析，以实现成功的区分。
