02
mai
2026
- Titre : Fatty acid and Antioxidant content of Chemlali extra virgin olive oil and its hydrophilic and lipophilic fractions
- DOI : 10.71751/JAAOGv1i1y2022-55-63
- Auteur : Imen GHORBEL; Mouna KHMEKHEM; Raja BEN AMAR; Naziha GRATI-KAMMOUN
- Abstract : Olive Oil is a fundamental ingredient of the Mediterranean diet for its healthy properties.
The aim of this study was to determine i) the most relevant quality parameters (Free acidity, K232, K270 and PV) of chemlali olive oil samples ii) to evaluate fatty acids and antioxidant content of chemlali olive oil and its hydrophilic (OOHF) and lipophilic (OOLF) fractions iii) to compare the chemical characterization between olive oil and its fractions. OOHF was extracted from olive oil using water by centrifugation process. OOLF was obtained by filtration process through a hydrophobic composite ceramic membrane. According to quality parameters, all our oil samples were classified in the category “extra virgin olive oil”. Our results showed that EVOO and OOLF fatty acid analyses revealed the same amount of MUFA. EVOO and OOHF contained a higher content of unsaponifiable components like polyphenols, which might contribute to olive oil’s beneficial effect. - Pagination : 55-63
02
mai
2026
- Titre : Fatty acid composition in olive (Olea europaea. L) oil of progenies obtained from Tunisian crossbreeding program
- DOI : 10.71751/JAAOGv1i1y2022-11-23
- Auteur : Mohamed AYADI1; Fathi BEN AMAR
- Abstract : Five preselected olive progenies from a Tunisian crossing program between 'Chemlali Sfax' variety and several Mediterranean varieties were evaluated for their fatty acid composition in comparison with the original variety. These progenies were planted in a trial orchard with 4mx6m space and irrigated conditions in the experimental station ‘Ettaous’ in Sfax (Tunisia). The analysis of variance revealed significant differences among progenies for C16:0, C16:1, C18:1, C18:2 and C18:3. The Hierarchical Cluster Analysis classified the progenies into three main groups. Two groups included four olive progenies characterized mainly by high oleic and low palmitic acid contents. There were significant negative correlations between oleic acid and palmitic, palmitoleic, linoleic and linolenic acids. The principal component analysis showed that two components accounted for 75% of the total variation observed and revealed the importance of the main fatty acids 16:0, 18:1 and 18:2 in the characterization of olive progenies. The fatty acid compositions of the oils from all the progenies comply with international standards and show more beneficial characteristics than the oil obtained from ‘Chemlali Sfax’ (higher oleic acid content and lower palmitic acid content) except for hybrid 2 oil which showed an unchanged fatty acid composition. From this study, four promising progenies could be candidates for release and further investigation on minor chemical components must be undertaken.
- Pagination : 11-23
02
mai
2026
- Titre : Impact of compost agronomic application on soil chemical properties and olive trees (Olea europaea, L) growth parameters
- DOI: 10.71751/JAAOGv1i1y2022-42-54
- Auteur : Salwa Magdich; Béchir Ben Rouina
- Abstract : The effects of compost agronomic application were evaluated in a Tunisian olive grove. Two treatments were selected: The first plot was spread by 5 T ha-1 of compost and the second plot was not amended, and served as a control during the crop season 2018/2019. This study aimed to investigate soil chemical properties, plant growth parameters, photosynthetic pigments, leaf mineral nutrient and olive oil quality of adult Chemlali olive trees subjected to compost application. The findings revealed an improvement of organic matter (39.8%), total nitrogen (41.3%), available phosphorus (24.5%) and exchangeable potassium (25.1%) soil contents, in amended plot with waste date compost compared to the control in superficial horizon (0-20 cm). In fact, a vegetative activity improvement according to the compost rate spread was noted with a shoot length increment equal to 20.42% in olive trees amended by compost. Moreover, significant raise of photosynthetic pigments contents in compost amended olive trees was noticed. The compost spreading significantly increased the mineral contents of leaves (N, P, K, Ca and Mg). Finally, the oil quality parameters did not show any significant difference. With the only exception of the phenol content, this was significantly higher in the oils extracted from compost amended olive trees than the control.
- Pagination : 42-54
02
mai
2026
- Titre : Réponse végétative, florifère et productive de l’olivier et variation de la composition phénolique de l’huile d’olive suite à l’utilisation de fertilisants foliaires biostimulants et cytotoxique
- DOI: 10.71751/JAAOGv1i1y2022-24-41
- Auteur :Imen ZOUARI; Beligh MECHRI; Faouzi ATTIA; Amel MGUIDICHE; Mohamed HAMMAMI; Mouna MEZGHANI AIACHI
- Abstract : Foliar fertilization is practiced to supplement the needs of the olive tree in order to improve yields while respecting the environment. The appearace of new inputs such as biostimulants helps stimulate natural processes in order to improve nutrient uptake and efficiency, tolerance to abiotic stress and crop quality. This research aimed to test different fertilizers and biostimulants, applied at different periods of the biological cycle of the olive tree. Two fertilizers, F1 rich in nitrogen and F2 rich in boron applied before flowering and a biostimulant F3 rich in calcium, applied during fruit growth were tested and applied during two successive years in a row on rain-fed olive trees of the Chemlali variety. The effects of these applications on the vegetative growth and flowering potential of the olive tree during two years of foliar treatments were studied. After two years of fertilization, the cumulative production was calculated and the olive oil was extracted to determine the content of total polyphenols as well as the phenolic compounds profile. One year after foliar fertilization, the treatment F1 rich in nitrogen improved the vegetative growth in length and thickness. After two years of fertilization, all treatments improved the vegetative growth. Flowering density was improved following the application of the treatment rich in nitrogen. Calcium-based treatment F3 showed the highest cumulative production. The most abundant phenolic compound is oleuropein aglycone. The treatment F3 rich in calcium-increased the content of the majority of phenolic compounds. This work has shown that foliar treatments can improve the vegetative and productive potential of the olive tree and optimize the quality of olive oil, particularly for the treatment F3 rich in calcium.
- Pagination : 24-41
