Application of synchronous fluorescence spectroscopy for determination of extra virgin olive oil adulteration

2009 ◽  
Vol 111 (12) ◽  
pp. 1233-1239 ◽  
Author(s):  
Anna Dankowska ◽  
Maria Małecka
Keyword(s):  
Fluorescence Spectroscopy ◽  
Olive Oil ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
Synchronous Fluorescence ◽  
Synchronous Fluorescence Spectroscopy

Determination of hydroxytyrosol and tyrosol in human urine after intake of extra virgin olive oil produced with an ultrasounds-based technology

2021 ◽  
pp. 114204
Author(s):  
Antonella Maria Aresta ◽  
Nicolella De Vietro ◽  
Maria Lisa Clodoveo ◽  
Riccardo Amirante ◽  
Filomena Corbo ◽  
...  
Keyword(s):  
Olive Oil ◽  
Human Urine ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil

Synchronous fluorescence spectroscopy for determination of tahini adulteration

Talanta ◽  
2017 ◽  
Vol 167 ◽  
pp. 557-562 ◽  
Author(s):  
Havva Tumay Temiz ◽  
Ugur Tamer ◽  
Aysel Berkkan ◽  
Ismail Hakki Boyaci
Keyword(s):  
Fluorescence Spectroscopy ◽  
Synchronous Fluorescence ◽  
Synchronous Fluorescence Spectroscopy

scholarly journals Liquid Carbon Dioxide Use in the Extraction of Extra Virgin Olive Oil From Olive Paste

2014 ◽  
Vol 3 (4) ◽  
pp. 119 ◽  
Author(s):  
Raffaele Romano ◽  
Nadia Manzo ◽  
Immacolata Montefusco ◽  
Annalisa Romano ◽  
Antonello Santini
Keyword(s):  
Carbon Dioxide ◽  
Fatty Acids ◽  
Olive Oil ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
A Value ◽  
Olive Mill Waste Water

<p>In this study the use of liquid carbon dioxide, CO<sub>2</sub>, for extraction of oil from olive paste (<em>Peranzana cultivar</em>)<strong> </strong>were examined and extracted oil was compared with oils obtained by centrifugation, pressure and use of chemical solvent.</p> <p>It is well known that the use of CO<sub>2</sub> has many advantages: miscibility with a wide range of molecules, food safety, non-flammability, absence of residues in the extract, possibility of total solvent recovery and no production of olive mill waste water that are highly polluting for the environment and require expansive disposal.</p> <p>Samples were subjected to the following analyses: determination of Free Fatty Acids (FFA), Peroxides Value (PV), Spectrophotometric Indices, Fatty Acids Composition (FA), determination of biophenols content and determination of Volatile Organic Compounds (VOCs). All samples showed FFA, PV and ?K values within the limits established by law for extra-virgin olive oil. The use of CO<sub>2</sub> did not catalyze hydrolysis, oxidation and condensation of double bonds. Centrifuged oils and oils extracted with carbon dioxide presented the lowest PV and FFA values. Extraction with liquid carbon dioxide contributed to an increasing of phenolic content with a value of 270.5 mg/kg, a value twice that of the oils extracted with centrifugation (135.3 mg/kg) or pressure methods (173.2 mg/kg). Oil extracted with liquid carbon dioxide showed the greatest amount of t-2-octenal and t-2-heptenal, giving herbaceous and pungent notes. Moreover the presence of aromatic compounds such as limonene, generally absent in olive oils, was only detected in the sample extracted with liquid carbon dioxide.</p>

scholarly journals The EFSA Health Claim on Olive Oil Polyphenols: Acid Hydrolysis Validation and Total Hydroxytyrosol and Tyrosol Determination in Italian Virgin Olive Oils

Molecules ◽  
2019 ◽  
Vol 24 (11) ◽  
pp. 2179 ◽  
Author(s):  
Maria Bellumori ◽  
Lorenzo Cecchi ◽  
Marzia Innocenti ◽  
Maria Lisa Clodoveo ◽  
Filomena Corbo ◽  
...  
Keyword(s):  
Olive Oil ◽  
Accurate Determination ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
Health Claims ◽  
Official Method ◽  
Virgin Olive Oils ◽  
Corrective Factor ◽  
Before And After

The health claims of olive oil represent an important marketing lever in raising the willingness to pay for a product, but world producers of extra virgin olive oil (EVOO) do not take advantage of it because there are still obstacles to their use. Among these, one issue is the lack of an official method for determination of all free and linked forms derived from secoiridoidic structures of hydroxytyrosol and tyrosol. In this study, different acidic hydrolytic procedures for analyzing the linked forms were tested. The best method was validated and then applied to more than 100 EVOOs. The content of oleuropein and ligstroside derivatives in EVOOs was indirectly evaluated comparing the amount of phenols before and after hydrolysis. After acidic hydrolysis, a high content of total tyrosol was found in most of the EVOOs. The use of a suitable corrective factor for the evaluation of hydroxytyrosol allows an accurate determination only using pure tyrosol as a standard. Further knowledge on the concentration of total hydroxytyrosol will assist in forecasting the resistance of oils against aging, its antioxidant potential and to better control its quality over time.

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