Removal of pomace residues is critical in quantification of element concentrations in extra virgin olive oil

Filip Poscic, Martina Furdek Turk, Niko Bacic, Nevenka Mikac, Daniela Bertoldi, Federica Camin, Maja Jukic Spika, Mirella Zanetic, Zed Rengel, Slavko Perica

Research output: Contribution to journalArticle

Abstract

Analysis of elements in Extra Virgin Olive Oil (EVOO) is challenging due to the complex oil matrix as well as very low element concentrations in oil. We postulate that inadequate sample preparation (in particular, the presence of pomace residue in oil) may significantly contribute to variations in EVOO element concentrations. In order to confirm this hypothesis, EVOO and pomace samples were analysed for content of 29 elements by ultrasonic acid extraction and ICP-MS detection. Comparative analyses of non-centrifuged and centrifuged EVOO samples confirmed significant influence of pomace residues on element concentrations. Ranges of macronutrients (25-286 ng g(-1)), micronutrients (0.3-1.1 ng g(-1)) and trace elements (0.001-0.2 ng g(-1)) in centrifuged EVOO samples were up to 1000 times lower than in non-centrifuged oils. We have shown that pomace residue, even when present in very small quantity (1 g of pomace in 1 kg of oil), significantly altered concentrations and relative proportions of many elements in EVOO. Therefore, adequate sample pre-treatment (removal of pomace residue via centrifugation) is essential for determining real multi-element composition of olive oil. This is critical in application of EVOO multi-element composition in traceability studies and determination of geographic origin of olive oil.

Original languageEnglish
Pages (from-to)39-46
Number of pages8
JournalJournal of Food Composition and Analysis
Volume77
DOIs
Publication statusPublished - Apr 2019

Cite this

Poscic, Filip ; Turk, Martina Furdek ; Bacic, Niko ; Mikac, Nevenka ; Bertoldi, Daniela ; Camin, Federica ; Spika, Maja Jukic ; Zanetic, Mirella ; Rengel, Zed ; Perica, Slavko. / Removal of pomace residues is critical in quantification of element concentrations in extra virgin olive oil. In: Journal of Food Composition and Analysis. 2019 ; Vol. 77. pp. 39-46.
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abstract = "Analysis of elements in Extra Virgin Olive Oil (EVOO) is challenging due to the complex oil matrix as well as very low element concentrations in oil. We postulate that inadequate sample preparation (in particular, the presence of pomace residue in oil) may significantly contribute to variations in EVOO element concentrations. In order to confirm this hypothesis, EVOO and pomace samples were analysed for content of 29 elements by ultrasonic acid extraction and ICP-MS detection. Comparative analyses of non-centrifuged and centrifuged EVOO samples confirmed significant influence of pomace residues on element concentrations. Ranges of macronutrients (25-286 ng g(-1)), micronutrients (0.3-1.1 ng g(-1)) and trace elements (0.001-0.2 ng g(-1)) in centrifuged EVOO samples were up to 1000 times lower than in non-centrifuged oils. We have shown that pomace residue, even when present in very small quantity (1 g of pomace in 1 kg of oil), significantly altered concentrations and relative proportions of many elements in EVOO. Therefore, adequate sample pre-treatment (removal of pomace residue via centrifugation) is essential for determining real multi-element composition of olive oil. This is critical in application of EVOO multi-element composition in traceability studies and determination of geographic origin of olive oil.",
keywords = "Centrifugation, Extra virgin olive oil, Food analysis, Food composition, ICP-MS, Multi-elemental analysis, Pomace, Sample preparation, Ultrasonic acid extraction, TRACE-ELEMENTS, ASSISTED EXTRACTION, VEGETABLE-OILS, EDIBLE OILS, ICP-AES, METALS, SAMPLES, SPAIN, ZN, MS",
author = "Filip Poscic and Turk, {Martina Furdek} and Niko Bacic and Nevenka Mikac and Daniela Bertoldi and Federica Camin and Spika, {Maja Jukic} and Mirella Zanetic and Zed Rengel and Slavko Perica",
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Removal of pomace residues is critical in quantification of element concentrations in extra virgin olive oil. / Poscic, Filip; Turk, Martina Furdek; Bacic, Niko; Mikac, Nevenka; Bertoldi, Daniela; Camin, Federica; Spika, Maja Jukic; Zanetic, Mirella; Rengel, Zed; Perica, Slavko.

In: Journal of Food Composition and Analysis, Vol. 77, 04.2019, p. 39-46.

Research output: Contribution to journalArticle

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T1 - Removal of pomace residues is critical in quantification of element concentrations in extra virgin olive oil

AU - Poscic, Filip

AU - Turk, Martina Furdek

AU - Bacic, Niko

AU - Mikac, Nevenka

AU - Bertoldi, Daniela

AU - Camin, Federica

AU - Spika, Maja Jukic

AU - Zanetic, Mirella

AU - Rengel, Zed

AU - Perica, Slavko

PY - 2019/4

Y1 - 2019/4

N2 - Analysis of elements in Extra Virgin Olive Oil (EVOO) is challenging due to the complex oil matrix as well as very low element concentrations in oil. We postulate that inadequate sample preparation (in particular, the presence of pomace residue in oil) may significantly contribute to variations in EVOO element concentrations. In order to confirm this hypothesis, EVOO and pomace samples were analysed for content of 29 elements by ultrasonic acid extraction and ICP-MS detection. Comparative analyses of non-centrifuged and centrifuged EVOO samples confirmed significant influence of pomace residues on element concentrations. Ranges of macronutrients (25-286 ng g(-1)), micronutrients (0.3-1.1 ng g(-1)) and trace elements (0.001-0.2 ng g(-1)) in centrifuged EVOO samples were up to 1000 times lower than in non-centrifuged oils. We have shown that pomace residue, even when present in very small quantity (1 g of pomace in 1 kg of oil), significantly altered concentrations and relative proportions of many elements in EVOO. Therefore, adequate sample pre-treatment (removal of pomace residue via centrifugation) is essential for determining real multi-element composition of olive oil. This is critical in application of EVOO multi-element composition in traceability studies and determination of geographic origin of olive oil.

AB - Analysis of elements in Extra Virgin Olive Oil (EVOO) is challenging due to the complex oil matrix as well as very low element concentrations in oil. We postulate that inadequate sample preparation (in particular, the presence of pomace residue in oil) may significantly contribute to variations in EVOO element concentrations. In order to confirm this hypothesis, EVOO and pomace samples were analysed for content of 29 elements by ultrasonic acid extraction and ICP-MS detection. Comparative analyses of non-centrifuged and centrifuged EVOO samples confirmed significant influence of pomace residues on element concentrations. Ranges of macronutrients (25-286 ng g(-1)), micronutrients (0.3-1.1 ng g(-1)) and trace elements (0.001-0.2 ng g(-1)) in centrifuged EVOO samples were up to 1000 times lower than in non-centrifuged oils. We have shown that pomace residue, even when present in very small quantity (1 g of pomace in 1 kg of oil), significantly altered concentrations and relative proportions of many elements in EVOO. Therefore, adequate sample pre-treatment (removal of pomace residue via centrifugation) is essential for determining real multi-element composition of olive oil. This is critical in application of EVOO multi-element composition in traceability studies and determination of geographic origin of olive oil.

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KW - Extra virgin olive oil

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KW - ICP-MS

KW - Multi-elemental analysis

KW - Pomace

KW - Sample preparation

KW - Ultrasonic acid extraction

KW - TRACE-ELEMENTS

KW - ASSISTED EXTRACTION

KW - VEGETABLE-OILS

KW - EDIBLE OILS

KW - ICP-AES

KW - METALS

KW - SAMPLES

KW - SPAIN

KW - ZN

KW - MS

U2 - 10.1016/j.jfca.2019.01.002

DO - 10.1016/j.jfca.2019.01.002

M3 - Article

VL - 77

SP - 39

EP - 46

JO - Journal of Food Composition and Analysis

JF - Journal of Food Composition and Analysis

SN - 0889-1575

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