D-optimal mixture design for the optimization of extraction induced by emulsion breaking for multielemental determination in edible vegetable oils by microwave-induced plasma optical emission spectrometry

CARNEIRO, CANDICE N.; AZCARATE, SILVANA M.; DE N PIRES, LAÍS; DE S DIAS, FABIO; CARNEIRO, ANGÉLICA F.; TEIXEIRA, LEONARDO S.G.

TALANTA

ELSEVIER SCIENCE BV

Año: 2020 vol. 219

0039-9140

A sample pretreatment based on an extraction process by emulsion breaking for multi-element determination inedible oils was developed. The determination of eight trace elements (Al, Ba, Cu, Cr, P, Ni, Ti, and Zn) wascarried out by microwave-induced plasma optical emission spectrometry (MIP OES) after the extraction procedure. A D-optimal mixture experimental design was used to obtain the best experimental conditions for theextraction induced by emulsion breaking (EIEB). The proportion of HNO3 solution, Triton X-100 solution andsample was evaluated in a multivariate manner. The best recovery efficiency was obtained with 1.0 mL of 30%(v/v) HNO3, 1.0 mL of 30% (w/v) Triton-X 100 and 3.0 mL of the sample. The precisions, established as therelative standard deviation (RSD, %), were better than 2.5% for all analytes. The developed method was appliedto the analysis of commercial vegetable oils with low limits of detection and good precision.