Antioxidants detection in aviation biokerosene by high-performance liquid chromatography using gold nanoparticles anchored in reduced graphene oxide

Author(s)

Delfino, Jose R. ^[1] ; da Silva, Jose Luiz ^[1] ; Marques, Aldalea L. B. ^[2] ; Stradiotto, Nelson R. ^{[1, 3, 4]}

Affiliation

^[1] Sao Paulo State Univ, Chem Inst, UNESP, Araraquara, SP - Brazil

^[2] Fed Univ Maranhao UFMA, Dept Chem Technol, Sao Luis, MA - Brazil

^[3] Sao Paulo State Univ, Bioenergy Res Inst, UNESP, Rio Claro, SP - Brazil

^[4] Fluminense Fed Univ UFF, Sch Ind & Met Engn, Volta Redonda, RJ - Brazil

• Document type: Journal article
• Source: FUEL; v. 260, JAN 15 2020.
• Web of Science Citations: 0

Abstract

This paper report the development of a new HPLC-pulsed amperometric detector (HPLC-PAD) for the determination of antioxidants using glass carbon electrode (GCE) modified with reduced graphene oxide (rGO) and gold nanoparticles (AuNPs). The modified electrode exhibited efficient electro-oxidation when it was applied in the analysis of three important antioxidants: N, N'-di-sec-butyl paraphenylenediamine (BPA), 2,6-Di-tert-butyl-phenol (TBP) and 2,6-Di-tert-butyl-4-methylphenol (BHT). The chromatographic separation was performed with an isocratic elution composed of acetonitrile/water (90:10% v/v) and 1% acetic acid. The chromatograms showed good separation of all components in periods of time less than 10 min. The developed method presented linear ranges of 5.0 x 10(-6 )-1.3 x 10(-4) mol L-1 (BPA), 2.5 x 10(-6) -1.0 x 10(-4) mol L-1 (TBP) and 7.5 x 10(-7) -1.3 x 10(-4) mol L-1 (BHT), and the analytical curves presented limits of detection of 1.2 x 10(-7), 1.7 x 10(-7) and 7.8 x 10(-8) mol L-1 for BPA, TBP and BHT, respectively. The values obtained for the recovery studies conducted ranged from 97.3 +/- 1.5% to 101.5 +/- 2.1%. The results showed that the method is reliable, since it presented high sensitivity, precision and accuracy. The developed method was successfully applied for the determination of antioxidants in a sample of biokerosene, consisting of isoparaffins synthesized from fermented and hydroprocessed sugars. The determined concentrations were TBP 3.1 x 10(-5) +/- 5.5 x 10(-6) mol L-1 and BHT 3.3 x 10(-5) +/- 2.9 x 10(-6) mol L-1. (AU)

• FAPESP's process: 17/25329-6 - DEVELOPMENT OF NEW ANALYTICAL METHODS FOR EVALUATION OF AVIATION BIOKEROSENE QUALITY
• Grantee: Nelson Ramos Stradiotto
• Support type: Regular Research Grants