title: Photoelectrochemical determination of tert-butylhydroquinone in edible oil samples employing CdSe/ZnS quantum dots and LiTCNE.
abstract: A novel photoelectrochemical sensor was developed for determination of tert-butyl-hydroquinone (TBHQ) in edible vegetable oils, based on CdSe/ZnS core-shell quantum dots sensitized with lithium tetracyanoethylenide (LiTCNE). The CdSe/ZnS/LiTCNE photoelectrochemical sensor presented a TBHQ photocurrent about 13-fold higher and a charge transfer resistance 62-fold lower than observed for a CdSe/ZnS sensor. The photoelectrochemical sensor showed selectivity to TBHQ, with a high photocurrent for this antioxidant compared to the photocurrent responses for other phenolic antioxidants. The CdSe/ZnS/LiTCNE photoelectrochemical sensor presented a linear range from 0.6 to 250μmolL-1, sensitivity of 0.012μALμmol-1, and a limit of detection of 0.21μmolL-1for TBHQ, under optimized experimental conditions. The sensor was successfully employed in the analysis of edible oil samples, with recoveries of between 98.25% and 99.83% achieved.
authors.affiliation: Department of Chemistry, Federal University of Maranhão, 65080-805 São Luís, MA, Brazil.
authors.forename: Thatyara Oliveira
authors.initials: TO
authors.lastname: Monteiro
authors.affiliation: Department of Chemistry, Federal University of Maranhão, 65080-805 São Luís, MA, Brazil.
authors.forename: Auro Atsushi
authors.initials: AA
authors.lastname: Tanaka
authors.affiliation: Department of Chemistry, Federal University of Maranhão, 65080-805 São Luís, MA, Brazil.
authors.forename: Flávio Santos
authors.initials: FS
authors.lastname: Damos
authors.affiliation: Department of Chemistry, Federal University of Maranhão, 65080-805 São Luís, MA, Brazil. Electronic address: rita.luz@ufma.br.
authors.forename: Rita de Cássia Silva
authors.initials: RC
authors.lastname: Luz
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D005503:Food Additives / Q000737:chemistry*; D005504:Food Analysis / Q000295:instrumentation / Q000379:methods*; D006873:Hydroquinones / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry; D010938:Plant Oils / Q000737:chemistry*; D045663:Quantum Dots / Q000737:chemistry
chemical_list: D000975:Antioxidants; D005503:Food Additives; D006873:Hydroquinones; D010938:Plant Oils; D008094:Lithium; C018855:2-tert-butylhydroquinone
keywords: CdSe/ZnS quantum dot; Edible oil; LiTCNE; Photoelectrochemical sensor; TBHQ detection