Olive Tree (Olea europeae L.) Leaves: Importance and Advances in the Analysis of Phenolic Compounds

Abaza, Leïla; Taamalli, Amani; Nsir, Houda; Zarrouk, Mokhtar

doi:10.3390/antiox4040682

Cited by 95 publications

(81 citation statements)

References 53 publications

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“…Its fruits and oil are essential components of Mediterranean diets (MDs). Olive tree is a prevalent plant species and one of the important cultivated crops of Mediterranean region (Abaza, Taamalli, Nsir, & Zarrouk, ). The olive tree is particularly special to mankind due to its recurrent appearances throughout historical and religious texts and its incorporation into traditional herbal medicines (Kaniewski et al, ).…”

Section: Introductionmentioning

confidence: 99%

Oleuropein: A natural antioxidant molecule in the treatment of metabolic syndrome

Ahamad

Toufeeq

Khan

et al. 2019

Phytotherapy Research

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Olive (Olea europaea Linn., Fam. Oleaceae) is commonly known as Zaytoon in Mediterranean region. Its fruits and oil are essential components of Mediterranean diets. Olive tree is a prevalent plant species and one of the important cultivated crops of Mediterranean region. Oleuropein is a phenolic constituents of olive, which, along with its related compounds, has been indicated to be majorly responsible for its beneficial effects. Oleuropein is a secoiridoid type of phenolic compound and consists of three structural subunits: hydroxytyrosol, elenolic acid, and a glucose molecule. It is also reported to be the chemotaxonomic marker of olive. The oleuropein is reported to possess a number of biological activities including action against dyslipidemia, antiobesity, antidiabetic, antioxidant, antiatherogenic, antihypertensive, antiinflammatory, and hepatoprotective actions. The scientific evidence supports the role of oleuropein as a potential agent against metabolic syndrome. The present review discusses chemistry of oleuropein along with potential role of oleuropein with reference to pathophysiology of metabolic syndrome.

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Section: Introductionmentioning

confidence: 99%

Oleuropein: A natural antioxidant molecule in the treatment of metabolic syndrome

Ahamad

Toufeeq

Khan

et al. 2019

Phytotherapy Research

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“…Polyphenolic compounds play an important role as health-protecting factors. They have been shown to exhibit different properties, such as anti-allergenic, anti-inflammatory, anti-microbial, anti-thrombotic, anti-cancer, cardio-protective, vasodilatory and antioxidant properties 1,2 . For the food industry, polyphenolic compounds have the potential to be utilized as preservatives in foods and are often valid alternatives to synthetic food additives 3 .…”

Section: Introductionmentioning

confidence: 99%

Development of Near Infrared Spectroscopy Models for Quantitative Prediction of the Content of Bioactive Compounds in Olive Leaves

Valinger

Kušen²,

Tušek

et al. 2019

Chem.Biochem.Eng.Q.

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The objective of this work was to evaluate the ability of artificial neural networks (ANN) in near infrared (NIR) spectra calibration models to predict the total polyphenolic content, antioxidant activity, and extraction yield of the olive leaves aqueous extracts prepared with three extraction procedures (conventional extraction, microwave-assisted extraction, and microwave-ultrasound-assisted extraction). Partial least squares (PLS) models were developed from principal component analyses (PCA) scores of NIR spectra of olive leaf aqueous extracts in terms of total polyphenols concentration, antioxidant activity, and extraction yield for each extraction procedure. PLS models were used to view which PCA scores are the best suited as input for ANN based on three output variables. ANN showed very good correlation of NIRs and all tested variables, especially in the case of total polyphenolic content (TPC). Therefore, ANN can be used for the prediction of total polyphenol concentrations, antioxidant activity, and extraction yield of plant extracts based on the NIR spectra.

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“…In Tunisia, olive culture is one of the most important agricultural activities, where the chemlali olive, is the most widespread and dominant olive cultivar (Bouaziz and Sayadi 2005).Leaves of Oe are used in Tunisian folk medicine to treat many inflammation type and bacterial infections (Haloui et al 2010). In fact, the leaf is the primary site of plant metabolism at the level of both primary and secondary plant products, and can be considered as a potential source of bioactive compounds (Abaza et al . 2015).…”

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confidence: 99%

Hepatoprotective and antioxidant properties of the aqueous extract of Olea europaea leaves against Diclofenac-induced liver damages in mice

2018

Appl. Physiol. Nutr. Metab.

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Historically, olive tree "Olea europaea" is one of the most important fruit trees in Mediterranean countries. Several studies suggest that olive leaf is a significant source of bioactive phenolic compounds compared to olive oil and fruits. This study was undertaken to investigate, the protective effect of the aqueous extract of « Chemlali » olive leaves against diclofenac-induced damages in liver and haematological alterations in swiss albinos mice. For this, twenty-eight mice were divided into four groups: a control group, a diclofenactreated group (2.37 mg/kg) for 5 consecutive days, a group orally gavaged with aqueous extract of olive leaves, (3.3g/kg) during 28 days, and a group pre-treated with aqueous extract of olive leaves during 23 days then injected with diclofenac for 5 days. Results obtained from this study revealed that administration of diclofenac alone led to disturbance of some haematological parameters including red and white blood cells (RBC), (WBC) haemoglobin (Hb) and platelets content (PLT). However, diclofenac-treated mice group showed a increasing in the levels of cholesterol, triglyceride, glucose, creatinine, urea, aspartate aminotransferase (ASAT), and alanine aminotransferase (ALAT). Additionally we noted a state of oxidative stress in hepatic tissue indicated by the increasing of lipid peroxidation level (TBARS) and decreasing of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX). Interstingly, pre-treatment with olive leaves extract improved the haematological parameters and minimised the adverse effect on the hepatic function markers induced by diclofenac. The beneficial effect of olive leaves could be attributed to its antioxidant components as confirmed by phytochemical analysis.

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Olive Tree (Olea europeae L.) Leaves: Importance and Advances in the Analysis of Phenolic Compounds

Cited by 95 publications

References 53 publications

Oleuropein: A natural antioxidant molecule in the treatment of metabolic syndrome

Oleuropein: A natural antioxidant molecule in the treatment of metabolic syndrome

Development of Near Infrared Spectroscopy Models for Quantitative Prediction of the Content of Bioactive Compounds in Olive Leaves

Hepatoprotective and antioxidant properties of the aqueous extract of Olea europaea leaves against Diclofenac-induced liver damages in mice

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