Poly(p-phenyleneethynylene)-based tongues discriminate fruit juices. Issue 3 (23rd January 2017)

• Record Type: Journal Article
• Authors: Han, Jinsong; Wang, Benhua; Bender, Markus; Seehafer, Kai; Bunz, Uwe H. F.
• Is Part Of: Analyst. Volume 142:Issue 3(2017)
• Page Start: 537
• Page End: 543
• Publication Date: 2017-01-23
• Subjects: Chemistry, Analytic -- Periodicals; 543
• DOI: 10.1039/c6an02387h
• Languages: English
• ISSNs: 0003-2654

Abstract

Abstract : A simple optoelectronic tongue, consisting of two charged, fluorescent poly( p -phenyleneethynylene)s at different pH-values, discriminates fruit juices after processing the quenching data by linear discriminant analysis. Abstract : We describe a simple optoelectronic tongue, consisting of a positively charged, fluorescent poly( para -phenyleneethynylene), P2, that reacts to fruit juices, when employed at three different pH-values (pH 3, 7, 13). This minimal tongue identifies and discriminates 14 different commercially available apple juices, 6 different grape juices and 5 different black currant juices from each other. A similar, negatively charged fluorescent polymer, P1, also achieved discrimination, but the analyte concentration had to be increased by a factor of 50. A mixture of black currant juice and red grape juice is identified as red grape juice, for specific combinations of grape and black currant juices. A mixture of red and green grape juice passes as red grape juice in our sensing system when it contains more than 70% of red grape juice. The data were obtained by fluorescence quenching of the conjugated polymers and processed by linear discriminant analysis of the collected data.