title: Layer-by-Layer Thin Film of Iron Phthalocyanine as a Simple and Fast Sensor for Polyphenol Determination in Tea Samples.
abstract: Polyphenols have attracted attention due to their antioxidant capacity and beneficial effects to health. Therefore, fast, inexpensive, and efficient methods to discriminate and to quantify polyphenols are of interest for food industry. In this paper, Layer-by-Layer films of poly(allylamine hydrochloride) and iron tetrasulfonated phthalocyanine were employed as sensor for determination of polyphenols in green tea (camellia sinensis), and green and roasted mate teas (ilex paraguariensis). The polyphenol sensor was tested in catechol standard solution by differential pulse voltammetry (DPV), reaching a limit of detection of 1.76 × 10-7mol/L. The determination of polyphenols in the tea samples was obtained by analytical curve and catechol standard addition using electrochemical techniques. Projection techniques (information visualization) were applied to the DPV results of the tea samples and a pattern of separation following the phenolic content was obtained. The results support the application of the sensor in fast classification of beverages according to their polyphenol content.
authors.affiliation: Dept. de Física, Faculdade de Ciências e Tecnologia (FCT), UNESP Univ Estadual Paulista, Presidente Prudente, SP, 19060-900, Brazil.
authors.forename: Mateus Dassie
authors.initials: MD
authors.lastname: Maximino
authors.affiliation: Dept. de Física, Faculdade de Ciências e Tecnologia (FCT), UNESP Univ Estadual Paulista, Presidente Prudente, SP, 19060-900, Brazil.
authors.forename: Cibely Silva
authors.initials: CS
authors.lastname: Martin
authors.affiliation: Inst. for Mathematics and Computer Science (ICMC), Univ. of São Paulo (USP), São Carlos, SP, CP 668, 13560-970, Brazil.
authors.forename: Fernando Vieira
authors.initials: FV
authors.lastname: Paulovich
authors.affiliation: Dept. de Física, Faculdade de Ciências e Tecnologia (FCT), UNESP Univ Estadual Paulista, Presidente Prudente, SP, 19060-900, Brazil. prialessio@gmail.com.
authors.forename: Priscila
authors.initials: P
authors.lastname: Alessio
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D001628:Beverages / Q000032:analysis; D028241:Camellia sinensis / Q000737:chemistry; D002396:Catechols / Q000032:analysis; D055664:Electrochemical Techniques; D005296:Ferrous Compounds / Q000737:chemistry*; D006801:Humans; D030019:Ilex paraguariensis / Q000737:chemistry; D007211:Indoles / Q000737:chemistry*; D010636:Phenols / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry*; D059808:Polyphenols / Q000032:analysis*; D013662:Tea / Q000737:chemistry*; D000069459:Teas, Herbal / Q000032:analysis*
chemical_list: D000975:Antioxidants; D002396:Catechols; D005296:Ferrous Compounds; D007211:Indoles; D010636:Phenols; D010936:Plant Extracts; D059808:Polyphenols; D013662:Tea; D000069459:Teas, Herbal; C493990:iron phthalocyanine; C034221:catechol
keywords: FeTsPc; LbL film; polyphenol sensor; tea samples