The chemical composition and quality of virgin olive oil may be influenced by genotype and different agronomic and technological factors.
Extra virgin olive oil is considered to be the best olive oil for its organoleptic characteristics (its capacity to preserved its original properties, such as smell, taste, colour and texture), for its oxidative stability and its chemical composition. It is practically the only vegetable oil that can be consumed directly in its raw state and contains important nutritional elements (vitamins, antioxidants, etc.).
The results from the italotunisian study reveal that the chemical composition and quality of virgin olive oil may be influenced by genotype and different agronomic and technological factors. The study was carried out by members of the Laboratoire Caractérisation et Qualité de l’Huile d’Olive, Centre de Biotechnologie de Borj-Ce´dria, Tunisia, and the Dipartimento di Scienze degli Alimenti, Università di Bologna, Italy; the paper was published in 2008 in the journal Food Chemistry.
A matter of genes... and maturity
The oxidative stability, sensory quality and health properties of virgin olive oil stem from a prominent and well-balanced chemical composition. In fact, the high content of oleic acid in olive oil serves to slow down penetration of fatty acids into arterial walls.
The chemical composition of virgin olive oil may be influenced by genotype and different agronomic (i.e. fruit ripeness degree, water supply) and technological factors. This research reports the evaluation of the influence of the olive ripening stage on the quality indices, the major and the minor components and the oxidative stability of the two main monovarietal Tunisian cultivars (cvv. Chétoui and Chemlali) virgin olive oils. The oils sampled at five different ripeness stages were submitted to different analysis.
Moreover, the triacylglycerol and fatty acid compositions, and minor components, pigments and their relation with the oil oxidative stability were evaluated. The tested oils showed very good correlation between the oxidative stability and their composition.
The chemical data discussed in this work can be considered useful in providing information about the presence in the oil of major and minor compounds depending on olive ripening. The analytical parameters studied remained widely within estimated limits of the regulation throughout the maturity process. Nevertheless, this research evidenced that the oleic/linoleic acid ratio shows a decreasing trend as the olives ripened.
With regard to phenolic compounds, Chétoui had the highest stability value. Finally, the present work shows in Chétoui, the anticipate harvest-date, gave the best results in terms of all the parameters considered. Instead, for the cv. All that data could be used to define the ideal ripening degree to confer a good balance between chemical profiles.
The Great Unknown: Risk-Taking Behavior in Adolescents
19.01.2017 | Max-Planck-Institut für Bildungsforschung
A sudden drop in outdoor temperature increases the risk of respiratory infections
11.01.2017 | University of Gothenburg
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
20.01.2017 | Awards Funding
20.01.2017 | Materials Sciences
20.01.2017 | Life Sciences