scholarly journals Identification of tetrahydrogeranylgeraniol and dihydrogeranylgeraniol in extra virgin olive oil

2018 ◽  
Vol 69 (3) ◽  
pp. 263 ◽  
Author(s):  
C. Mariani ◽  
S. Cesa ◽  
C. Ingallina ◽  
L. Mannina
Keyword(s):  
Olive Oil ◽  
Aliphatic Alcohol ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
First Time ◽  
Hydrolysis Of

Olive oil contains many different compounds which are responsible for its nutritional and sensorial value. However, some compounds present in olive oil at very low amounts have not yet been identified. Here, the detection of tetrahydrogeranylgeraniol and dihydrogeranylgeraniol, in both the total aliphatic alcohol and waxy fractions of extra virgin olive oil, is reported for the first time using GC and GC-MS methodologies. It was suggested that tetrahydrogeranylgeraniol and dihydrogeranylgeraniol do not originate from the hydrolysis of the chlorophyll but are present as diterpenic esters.

scholarly journals Influence of temperature and beta-carotene on the processes of hydrolysis and oxidation of triacylglycerins in extra virgin olive oil during storage

2021 ◽  
Vol 83 (2) ◽  
pp. 126-132
Author(s):  
V. S. Kolodiaznaia ◽  
M. Alnakoud ◽  
Т. В. Аlekseeva
Keyword(s):  
Fatty Acids ◽  
Olive Oil ◽  
Storage Temperature ◽  
Virgin Olive Oil ◽  
Beta Carotene ◽  
Extra Virgin Olive Oil ◽  
Climatic Conditions ◽  
Oxidative Processes ◽  
And Storage ◽  
Hydrolysis Of

The article presents the results of studies on the effect of antioxidant beta-carotene and storage temperature on hydrolytic and oxidative processes occurring during storage of extra virgin olive oil obtained from olives grown in the soil and climatic conditions of Syria. The aim is to study the effect of temperature and beta-carotene on the kinetics of reactions of hydrolysis of triacylglycerides (TAG) and oxidation of free fatty acids (FFA) of olive oil during storage. The object of the study was extra virgin olive oil obtained from olives grown in the soil and climatic conditions of Syria according to the generally accepted technology (harvest 2019). Control sample № 1 (without the addition of antioxidant) and experimental samples with the addition of beta-carotene in the amount of 400 (№ 2) and 600 mg/100 g (№ 3) were stored at a temperature of 18 °C for 7 months. Oil sample № 4 without the addition of antioxidants was stored at 4 °C. In the samples under study, the acid value was periodically determined by the titration method, according to the change in which the formation of free fatty acids during the hydrolysis of TAG, as well as the peroxide value characterizing the formation of FFA oxidation products, was estimated. The organoleptic assessment of the oil quality indicators according to the studied descriptors was 5 points. The rate constants of TAG hydrolysis and oxidation of FFA in olive oil have been calculated. It has been shown that during the storage of experimental oil samples the hydrolytic and oxidative processes of TAG significantly slow down with the addition of the antioxidant beta-carotene. It was found that minimal changes in the content of TAG hydrolysis products and FFA oxidation during storage of olive oil at a temperature of + 18 °C are characteristic for samples containing 400 mg/L of beta-carotene and for oil samples stored at a temperature of + 4 °C without the addition of an antioxidant. Expiration dates of olive oil are substantiated depending on the dose of beta-carotene and storage temperature

scholarly journals Identification of Lignans as Major Components in the Phenolic Fraction of Olive Oil

2000 ◽  
Vol 46 (7) ◽  
pp. 976-988 ◽  
Author(s):  
Robert W Owen ◽  
Walter Mier ◽  
Attilio Giacosa ◽  
William E Hull ◽  
Bertold Spiegelhalder ◽  
...  
Keyword(s):  
Olive Oil ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
Phenolic Antioxidants ◽  
Spectroscopic Techniques ◽  
Phenolic Fraction ◽  
1H And 13C Nmr ◽  
Unequivocal Identification ◽  
Chemopreventive Activity ◽  
First Time

Abstract Background: Because olive oil is an important component of the Mediterranean diet, it is necessary to establish unequivocal identification of the major potential antioxidant phenolic compounds it contains. Methods: The major phenolic antioxidants in extra virgin olive oil were isolated and purified. Structural analysis was conducted using several spectroscopic techniques, including mass spectrometry and nuclear magnetic resonance (NMR). In particular, detailed 1H and 13C NMR data are presented, and several assignment errors in the literature are corrected. Results: The data show for the first time that the lignans (+)-1-acetoxypinoresinol and (+)-pinoresinol are major components of the phenolic fraction of olive oils. These lignans, which are potent antioxidants, are absent in seed oils and virtually absent in refined virgin oils but are present at concentrations of up to 100 mg/kg (mean ± SE, 41.53 ± 3.93 mg/kg; range, 0.65–99.97 mg/kg) in extra virgin oils. As with the simple phenols and secoiridoids, there is considerable interoil variation in lignan concentrations. Foods containing high amounts of lignan precursors have been found to be protective against breast, colon, and prostate cancer. Conclusion: Lignans, as natural components of the diet, may be important modulators of cancer chemopreventive activity.

scholarly journals Evolution of Flavors in Extra Virgin Olive Oil Shelf-Life

Antioxidants ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 368
Author(s):  
Paula Garcia-Oliveira ◽  
Cecilia Jimenez-Lopez ◽  
Catarina Lourenço-Lopes ◽  
Franklin Chamorro ◽  
Antia Gonzalez Pereira ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Shelf Life ◽  
Olive Oil ◽  
Unsaturated Fatty Acids ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
Volatile Fraction ◽  
Organoleptic Characteristics ◽  
Olive Variety ◽  
Minor Compounds

Extra virgin olive oil (EVOO) is one of the most distinctive ingredients of the Mediterranean diet. There are many properties related to this golden ingredient, from supreme organoleptic characteristics to benefits for human health. EVOO contains in its composition molecules capable of exerting bioactivities such as cardio protection, antioxidant, anti-inflammatory, antidiabetic, and anticancer activity, among others, mainly caused by unsaturated fatty acids and certain minor compounds such as tocopherols or phenolic compounds. EVOO is considered the highest quality vegetable oil, which also implies a high sensory quality. The organoleptic properties related to the flavor of this valued product are also due to the presence of a series of compounds in its composition, mainly some carbonyl compounds found in the volatile fraction, although some minor compounds such as phenolic compounds also contribute. However, these properties are greatly affected by the incidence of certain factors, both intrinsic, such as the olive variety, and extrinsic, such as the growing conditions, so that each EVOO has a particular flavor. Furthermore, these flavors are susceptible to change under the influence of other factors throughout the oil's shelf-life, such as oxidation or temperature. This work offers a description of some of the most remarkable compounds responsible for EVOO’s unique flavor and aroma, the factors affecting them, the mechanism that lead to the degradation of EVOO, and how flavors can be altered during the shelf-life of the oil, as well as several strategies suggested for the preservation of this flavor, on which the quality of the product also depends.

Irrigation effects on phenolic profile and extra virgin olive oil quality of ''Chemlali'' variety grown in South Tunisia

2021 ◽  
Vol 141 ◽  
pp. 322-329
Author(s):  
Jihed Faghim ◽  
Mbarka Ben Mohamed ◽  
Mohamed Bagues ◽  
Kamel Nagaz ◽  
Tebra Triki ◽  
...  
Keyword(s):  
Olive Oil ◽  
Oil Quality ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
Phenolic Profile ◽  
Olive Oil Quality ◽  
Irrigation Effects ◽  
South Tunisia

scholarly journals Modeling the effect of heat treatment on fatty acid composition in home-made olive oil preparations

2020 ◽  
Vol 15 (1) ◽  
pp. 606-618 ◽  
Author(s):  
Dani Dordevic ◽  
Ivan Kushkevych ◽  
Simona Jancikova ◽  
Sanja Cavar Zeljkovic ◽  
Michal Zdarsky ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Fatty Acids ◽  
Fatty Acid ◽  
Olive Oil ◽  
Heating Temperature ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
Fatty Acid Profiles ◽  
Refined Olive Oil ◽  
Cross Correlation Analysis

AbstractThe aim of this study was to simulate olive oil use and to monitor changes in the profile of fatty acids in home-made preparations using olive oil, which involve repeated heat treatment cycles. The material used in the experiment consisted of extra virgin and refined olive oil samples. Fatty acid profiles of olive oil samples were monitored after each heating cycle (10 min). The outcomes showed that cycles of heat treatment cause significant (p < 0.05) differences in the fatty acid profile of olive oil. A similar trend of differences (p < 0.05) was found between fatty acid profiles in extra virgin and refined olive oils. As expected, the main differences occurred in monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs). Cross-correlation analysis also showed differences between the fatty acid profiles. The most prolific changes were observed between the control samples and the heated (at 180°C) samples of refined olive oil in PUFAs, though a heating temperature of 220°C resulted in similar decrease in MUFAs and PUFAs, in both extra virgin and refined olive oil samples. The study showed differences in fatty acid profiles that can occur during the culinary heating of olive oil. Furthermore, the study indicated that culinary heating of extra virgin olive oil produced results similar to those of the refined olive oil heating at a lower temperature below 180°C.

scholarly journals Effects of the Filtration on the Biotic Fraction of Extra Virgin Olive Oil

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1677
Author(s):  
Biagi Angelo Zullo ◽  
Giulia Venditti ◽  
Gino Ciafardini
Keyword(s):  
Olive Oil ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
Filter Press ◽  
Filtration Process ◽  
Virgin Olive Oils ◽  
Olive Oils ◽  
Filtration System ◽  
Cellulose Filter ◽  
Initial Contamination

Filtration is a widely used process in the production of extra virgin olive oil. We studied the influence of filtration performed with cotton filters and cellulose filter press on the biotic components of the oily mass containing probiotic traits in two freshly produced monocultivar extra virgin olive oils. The concentration of bacteria was reduced from 100% to 28%, while that of fungi was reduced from 100% to 44% after filtration, according to the filtration system and the initial contamination of the original monocultivar extra virgin olive oil. Compared with the control, the yeast content in the oil samples filtered with cotton filters was reduced from 37% to 11% depending on the cultivar. In the oil filtered with cellulose filter press, the yeast content reduced from 42% to 16%. The viable yeast that passed through the oily mass during the filtration process with cellulose filter press, unlike all the other samples, were unable to survive in the oil after a month of storage. The possible health benefits of compounds from both the biotic and abiotic fraction of the oil, compared to the control, were significantly low when filtered with the cellulose filter press.

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

scholarly journals Extra Virgin Olive Oil (EVOO): Quality, Safety, Authenticity, and Adulteration

Foods ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 995
Author(s):  
Theodoros Varzakas
Keyword(s):  
Food Intake ◽  
Olive Oil ◽  
Mediterranean Diet ◽  
Mediterranean Basin ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
The Mediterranean ◽  
The Mediterranean Basin

The prevention and bioactivity effects associated with the so-called “Mediterranean diet” make olive oil the most consumed edible fat in the food intake of the Mediterranean basin [...]

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