Effect of Combined Sulfur and Nitrogen Foliar Supply on Olive Oil Volatile Compounds and Sensory Attributes

Vidović, Nikolina; Pasković, Igor; Marcelić, Šime; Lukić, Igor; Bubola, Karolina Brkić; Klisović, Dora; Novoselić, Anja; Palčić, Igor; Pasković, Marija Polić; Ćustić, Mirjana Herak; Petek, Marko; Špika, Maja Jukić; Pećina, Marija; Pongrac, Paula; Ban, Smiljana Goreta

doi:10.3390/horticulturae8100912

Cited by 3 publications

(2 citation statements)

References 54 publications

(93 reference statements)

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“…Total phenolic content was determined using the colorimetric Folin–Ciocalteu method [ 22 ] with some modifications. Briefly, 2 µL of the extract was mixed with 18 µL of distilled deionized (dd) water and 140 µL sodium carbonate (6%) was added.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Geographical Location on the Phenolic and Mineral Composition of Chetoui Olive Leaves

Zakraoui

Hannachi

Pasković

et al. 2023

Foods

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In this study, we investigated the influence of pedological parameters and variation of altitude on the mineral nutrients, phenolic compounds, and antioxidant activities of olive leaves. Samples of the Chetoui cultivar were collected from eight geographical locations with different altitudes. Levels of phenolic compounds varied according to the altitude. Classification of the locations revealed that altitude 1 (>500 m) was characterized by high levels of secoiridoids and simple phenols, while altitude 2 (500–300 m) and altitude 3 (<300 m) were higher in flavonoids. Levels of Mn, Ca and B in the leaves and level of Zn in the soil were significantly correlated with the abundance of oleuropein and luteolin-7-O glucoside, the most important phenols in Chetoui olive leaves. The results suggest that, in addition to pedological criteria, environmental conditions also influence the formation of phenolic compounds.

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Section: Methodsmentioning

confidence: 99%

“…The analysis of minerals was determined using the method described by Vidović et al [ 22 ]. In this experiment, 200 mg of dried olive leaf samples were accurately weighed into a microwave pressure vessel.…”

Section: Methodsmentioning

confidence: 99%

Effect of Geographical Location on the Phenolic and Mineral Composition of Chetoui Olive Leaves

Zakraoui

Hannachi

Pasković

et al. 2023

Foods

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Cultivar-Dependent Effect of Silicon Foliar Application on Olive Fruit Yield, Morphology, and Olive Oil Quality Parameters

Franić,

Pasković,

Goreta Ban

et al. 2024

Applied Sciences

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Silicon is one of the most abundant elements in the Earth’s crust and, although it is not an essential element for plant growth, it is considered beneficial as it can help in defense against biotic and abiotic stresses. Research on the effects of foliar sprays containing silicon has been well documented for different plants. However, in olive plants there is considerably less research focused on silicon soluble foliar formulations, which differs from the application of inert materials, like kaolin. The purpose of this study was to evaluate the effects of three increasing levels of foliar-applied soluble silicon on the characteristics of olive fruit and olive oil parameters. Fruit morphology, contents of multiple polyphenols, fatty acid profiles and mineral content in olive oil, olive oil quality parameters, fruit yield, and olive oil production parameters were assessed. Results show significant effects of silicon treatments on palmitic, palmitoleic, and linoleic acids and on the content of mono- and polyunsaturated fatty acids. Polyphenols were generally more influenced by the cultivar rather than by silicon. Apigenin, phenolic acids, and flavonoids were impacted by silicon treatments. Fruit morphology was affected by silicon treatment and, generally, parameters (fruit and seed length, width, and mass) increased at higher silicon application. This was concomitantly seen in both fruit and extra virgin olive oil (EVOO) yield increase, but only for the Leccino cultivar, suggesting specific cultivar x treatment interplay for those traits. Increases in mineral contents in olive oil due to Si treatments were not found, except for silicon, where Si2 and Si3 treatments yielded higher silicon content in olive oil compared to control. Results of this study indicate that Silicon Foliar Application could be used to enhance olive yield and only slightly modifies the fatty acid composition of olive oil and the content of some of the phenols. Although silicon application did affect several parameters, the effect of cultivar was more pronounced in affecting most of the parameters. Further research could be driven towards the effect of foliar silicon on these parameters under environmental stress factors.

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Screening of Chemical Composition, Antimicrobial and Antioxidant Activities of Essential Oil and Volatile Fraction from Olive Mill Wastewater

et al. 2022

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Oil mill wastewater is the main by-product of the olive oil industry resulting mainly from the treatment and pressing of olives in mills. It is a rich source of nutrients and phytochemicals with a wide spectrum of biological properties. The present study focuses on the chemical analysis and evaluation of the antimicrobial and antioxidant activity of the essential oil (EO) and the volatile fraction (VF) obtained, respectively, by hydrodistillation. Chemical analysis by gas chromatography coupled to mass spectrometry (GC/MS) and a flame ionisation detector (GC/FID) revealed the predominance of phenolic compounds (25.71%, 60.36%) and fatty acids (62.37%, 38.25%) for the VF and EO, respectively. It was also shown that the main compounds were oleic acid (24.9%) for the VF and 4-ethylphenol (28.5%) for the EO. The results of the antimicrobial activity in terms of MIC values against twelve microorganisms showed that, overall, the VF was more active than the EO. The antioxidant activity of the VF and EO was evaluated using the DPPH assay and expressed as half-maximal inhibitory concentration (IC50), where the EO (218 μg/mL) showed better antioxidant activity than the VF (244 μg/mL). The results also revealed that the antimicrobial activity and antioxidant activity values for both oils were significantly lower than the standards used.

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Effect of Combined Sulfur and Nitrogen Foliar Supply on Olive Oil Volatile Compounds and Sensory Attributes

Cited by 3 publications

References 54 publications

Effect of Geographical Location on the Phenolic and Mineral Composition of Chetoui Olive Leaves

Effect of Geographical Location on the Phenolic and Mineral Composition of Chetoui Olive Leaves

Cultivar-Dependent Effect of Silicon Foliar Application on Olive Fruit Yield, Morphology, and Olive Oil Quality Parameters

Screening of Chemical Composition, Antimicrobial and Antioxidant Activities of Essential Oil and Volatile Fraction from Olive Mill Wastewater

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