Determination of trace elements in extra virgin olive oils: A pilot study on the geographical characterisation

Effect of Agro‐Environmental Factors on the Mineral Content of Olive Oils: Categorization of the Three Major Portuguese Cultivars

“…Thus, the quality of olive oil is usually determined by the assessment of classic parameters such as free acidity and peroxide values and also by the spectrophotometric absorbance at selected wavelengths (K 232 and K 270 ), the fatty acid composition and the organoleptic characteristics. Nevertheless, the content of minerals in this food has been underestimated regarding its relevance for monitoring olive oil quality and safety, while representing a very informative dataset for its characterization and evaluation of adulteration practices [5][6][7]. This is of special relevance, since food intake is considered one of the major sources of toxic metals for humans, relative to other sources of toxins like inhalation or dermal contact [8].…”

Use of Constrained Mixture Design in the Optimization of a Method Based on Extraction Induced by Emulsion Breaking for the Determination of Ca, Mg, Mn, Fe and Zn from Palm Oil by Flame Atomic Absorption Spectrometry

“…In general, certain factors such as the presence of oxygen and trace metals, light exposure and storage temperature must be controlled to decrease oil oxidation. 3 There are many records showing that trace elements such as Fe, Cu, Mn and Ni affect the flavor and oxidative stability of oils, with catalytic effects on the self-oxidation mechanism. 4 Foods with high-fat content, such as palm oil, are difficult to decompose, since they present a complex organic structure, as well as high concentrations of oily components.…”

“…4 Foods with high-fat content, such as palm oil, are difficult to decompose, since they present a complex organic structure, as well as high concentrations of oily components. 3 Thus, the extraction induced by emulsion breaking (EIEB) technique is a very promising alternative for this type of samples. When two immiscible liquids are placed in contact, there is a tendency for them to become dispersed in one another as globules (or droplets) when the action of a mechanical force is observed.…”

Determination of Ni and Zn in an Oil Matrix using Schiff Base‐Assisted Extraction Followed by a Flame Atomic Absorption Spectrometer: A Simple Strategy to Determine Ni and Zn

“…Therefore, accurate and precise determination of trace levels of elements in oil samples is still an analytical challenge for analysts. Dry ashing (Coco, Ceccon, Ciraolo, & Novelli, 2003;Deck & Kaiser, 1970), acid digestion (Ansari et al, 2009;Cindric, Zeiner, & Steffan, 2007;Zeiner, Steffan, & Cindric, 2005), emulsification (Gunduz & Akman, 2015;Hsu, Jiang, & Sahayam, 2013), dilution with solvent (Cabrera-Vique, Bouzas, & Oliveras-Lopez, 2012), and liquid-liquid extraction (LLE) (Lopez-Garcia, Briceno, Vicente-Martinez, & Hernandez-Cordoba, 2015) are some of the procedures that are used for sample preparation. The ashing and acid digestion are completely matrix-destructive procedures that are prone to contamination/loss of analytes or need high-priced equipment with experienced staff.…”

“…Alternatively, the methodologies that include formation of emulsion or dilution of oil with organic solvents are also well described in the literature. Although avoiding time-consuming and high-energyneeded matrix-destructive procedures, emulsification and dilution procedures suffer from unstable emulsions, toxic reagents, and reduced limits of detection (Ansari et al, 2009; Ba gdat Yaşar, Köse Baran, & Alkan, 2012;Cabrera-Vique et al, 2012;Cindric et al, 2007;Coco et al, 2003;Deck & Kaiser, 1970;Gunduz & Akman, 2015;Hsu et al, 2013;Zeiner et al, 2005).…”