title: Simple and fast method for iron determination in white and red wines using dispersive liquid-liquid microextraction and ultraviolet-visible spectrophotometry.
abstract: This work reports the development of a method for Fe extraction in white and red wines using dispersive liquid-liquid microextraction (DLLME) and determination by ultraviolet-visible spectrophotometry. For optimization of the DLLME method, the following parameters were evaluated: type and volume of dispersive (1300 μL of acetonitrile) and extraction (80 μL of C(2)Cl(4)) solvents, pH (3.0), concentration of ammonium pyrrolidinedithiocarbamate (APDC, 500 μL of 1% m/v APDC solution), NaCl concentration (not added), and extraction time. The calibration curve was performed using the analyte addition method, and the limit of detection and relative standard deviation were 0.2 mg L(-1) and below 7%, respectively. The accuracy was evaluated by comparison of results obtained after Fe determination by graphite furnace atomic absorption spectrometry, with agreement ranging from 94 to 105%. The proposed method was applied for Fe determination in white and red wines with concentrations ranging from 1.3 to 4.7 mg L(-1).
authors: Escola de Química e Alimentos, Universidade Federal do Rio Grande , Rio Grande, Rio Grande do Sul 96203-900, Brazil.
authors: Juliana V
authors: JV
authors: Maciel
authors: Bruno M
authors: BM
authors: Soares
authors: Jaime S
authors: JS
authors: Mandlate
authors: Rochele S
authors: RS
authors: Picoloto
authors: Cezar A
authors: CA
authors: Bizzi
authors: Erico M M
authors: EM
authors: Flores
authors: Fabio A
authors: FA
authors: Duarte
mesh_terms: D007501:Iron / Q000032:analysis* / Q000302:isolation & purification*; D059627:Liquid Phase Microextraction / Q000379:methods*; D013053:Spectrophotometry / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D014920:Wine / Q000032:analysis*
chemical_list: D007501:Iron
keywords: GFAAS; UV−vis spectrophotometry; dispersive liquid−liquid microextraction; food analysis; iron; sample preparation; wine