(1) Background: Extra-virgin olive oil (EVOO) is a precious and universally studied food matrix. Recently, the quantitative chemical composition was investigated by an innovative processing method for the nuclear magnetic resonance (NMR) experiments called Multi-Assignment Recovered Analysis (MARA)-NMR. (2) Methods: Any EVOO 13-carbon NMR (13C-NMR) profile displayed inconsistent signals. This mismatch was resolved by comparing NMR data to the official gas-chromatographic flame ionization detection (GC-FID) experiments: the analyses concerned many EVOOs but also the “exotic” Capparis spinosa oil (CSO). (3) Results: NMR and GC-FID evidenced the overwhelming presence of cis-vaccenic esters in the CSO and, more importantly, cis-vaccenic 13C-NMR resonances unequivocally matched the misunderstood 13C-NMR signals of EVOOs. The updated assignment revealed the unexpected relevant presence of cis-vaccenic ester (around 3%) in EVOOs; it was neglected, so far, because routine and official GC-FID profiles did not resolve oleic and cis-vaccenic signals leading to the total quantification of both monounsaturated fatty esters. (4) Conclusions: The rebuilt MARA-NMR and GC-FID interpretations consistently show a meaningful presence of cis-vaccenic esters in EVOOs, whose content could be a discrimination factor featuring specific cultivar or geographical origin. The study paves the way toward new quantification panels and scientific research concerning vegetable oils.

Oleic acid is not the only relevant mono-unsaturated fatty ester in olive oil / Archimede, Rotondo; Giovanna Loredana La Torre, ; Giacomo, Dugo; Nicola, Cicero; Antonello, Santini; Salvo, Andrea. - In: FOODS. - ISSN 2304-8158. - 9:4(2020), pp. 1-13. [110.3390/foods9040384]

Oleic acid is not the only relevant mono-unsaturated fatty ester in olive oil

Andrea Salvo.
Ultimo
Conceptualization
2020

Abstract

(1) Background: Extra-virgin olive oil (EVOO) is a precious and universally studied food matrix. Recently, the quantitative chemical composition was investigated by an innovative processing method for the nuclear magnetic resonance (NMR) experiments called Multi-Assignment Recovered Analysis (MARA)-NMR. (2) Methods: Any EVOO 13-carbon NMR (13C-NMR) profile displayed inconsistent signals. This mismatch was resolved by comparing NMR data to the official gas-chromatographic flame ionization detection (GC-FID) experiments: the analyses concerned many EVOOs but also the “exotic” Capparis spinosa oil (CSO). (3) Results: NMR and GC-FID evidenced the overwhelming presence of cis-vaccenic esters in the CSO and, more importantly, cis-vaccenic 13C-NMR resonances unequivocally matched the misunderstood 13C-NMR signals of EVOOs. The updated assignment revealed the unexpected relevant presence of cis-vaccenic ester (around 3%) in EVOOs; it was neglected, so far, because routine and official GC-FID profiles did not resolve oleic and cis-vaccenic signals leading to the total quantification of both monounsaturated fatty esters. (4) Conclusions: The rebuilt MARA-NMR and GC-FID interpretations consistently show a meaningful presence of cis-vaccenic esters in EVOOs, whose content could be a discrimination factor featuring specific cultivar or geographical origin. The study paves the way toward new quantification panels and scientific research concerning vegetable oils.
2020
cis-vaccenic; monounsaturated fatty; glycerols; NMR analysis; olive oil; Capparis spinosa; 13C-NMR; MARA-NMR
01 Pubblicazione su rivista::01a Articolo in rivista
Oleic acid is not the only relevant mono-unsaturated fatty ester in olive oil / Archimede, Rotondo; Giovanna Loredana La Torre, ; Giacomo, Dugo; Nicola, Cicero; Antonello, Santini; Salvo, Andrea. - In: FOODS. - ISSN 2304-8158. - 9:4(2020), pp. 1-13. [110.3390/foods9040384]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1380600
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