Evaluation of Phytochemical and Antioxidant Properties of 15 Italian Olea europaea L. Cultivar Leaves

Olive leaf extracts are of special interest due to their proven therapeutic effects. However, they are still considered a by-product of the table olive and the oil industries. In order to learn possible ways of exploiting this waste for health purposes, we investigated the phytochemical profiles and antioxidant activities in the leaves of 15 Italian Olea europaea L. cultivars grown in the same pedoclimatic conditions. The phenolic profiles and amounts of their seven representative compounds were analyzed using HPLC ESI/MS-TOF. The antioxidant activities were determined using three different antioxidant assays (DPPH, ORAC, and superoxide anion scavenging assay). Wide ranges of total phenolic content (11.39–48.62 g GAE kg−1 dry weight) and antioxidant activities (DPPH values: 8.67–29.89 µmol TE mg−1 dry weight, ORAC values: 0.81–4.25 µmol TE mg−1 dry weight, superoxide anion scavenging activity values: 27.66–48.92 µmol TE mg−1 dry weight) were found in the cultivars. In particular, the cultivars Itrana, Apollo, and Maurino, showed a high amount of total phenols and antioxidant activity, and therefore represent a suitable natural source of biological compounds for use in terms of health benefits.

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Chemical composition, antioxidant activities, in an allergic asthma model, of Olea europaea L. leaf extracts from Collo (Skikda, Algeria)

Drug and Chemical Toxicology ◽

10.1080/01480545.2019.1679827 ◽

2019 ◽

pp. 1-12

Author(s):

Zineb Rouibah ◽

Amir Ben Mensour ◽

Ons Rekik ◽

Mahieddine Boumendjel ◽

Faiza Taibi ◽

...

Keyword(s):

Chemical Composition ◽

Allergic Asthma ◽

Olea Europaea ◽

Antioxidant Activities ◽

Leaf Extracts ◽

Olea Europaea L ◽

Asthma Model ◽

Olea Europaéa

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Total Phenolic Contents and Antioxidant Activities of Olive (Olea europaea L.) Pomace and Their Ingredients

Journal of Al-Nahrain University-Science ◽

10.22401/jnus.21.2.16 ◽

2018 ◽

Vol 21 (2) ◽

pp. 106-111 ◽

Cited By ~ 1

Author(s):

Munther Hamza Rathi ◽

◽

Russl Hassan Turki ◽

Keyword(s):

Olea Europaea ◽

Antioxidant Activities ◽

Total Phenolic ◽

Phenolic Contents ◽

Olea Europaea L ◽

Total Phenolic Contents ◽

Olea Europaéa

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Phytochemical Properties and Anti-Proliferative Activity of Olea europaea L. Leaf Extracts against Pancreatic Cancer Cells

Molecules ◽

10.3390/molecules200712992 ◽

2015 ◽

Vol 20 (7) ◽

pp. 12992-13004 ◽

Cited By ~ 30

Author(s):

Chloe Goldsmith ◽

Quan Vuong ◽

Elham Sadeqzadeh ◽

Costas Stathopoulos ◽

Paul Roach ◽

...

Keyword(s):

Pancreatic Cancer ◽

Cancer Cells ◽

Olea Europaea ◽

Proliferative Activity ◽

Leaf Extracts ◽

Olea Europaea L ◽

Pancreatic Cancer Cells ◽

Olea Europaéa

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Selective ultrasound-enhanced enzymatic hydrolysis of oleuropein to its aglycon in olive (Olea europaea L.) leaf extracts

Food Chemistry ◽

10.1016/j.foodchem.2016.10.011 ◽

2017 ◽

Vol 220 ◽

pp. 282-288 ◽

Cited By ~ 13

Author(s):

María del Mar Delgado-Povedano ◽

Feliciano Priego-Capote ◽

María Dolores Luque de Castro

Keyword(s):

Enzymatic Hydrolysis ◽

Olea Europaea ◽

Leaf Extracts ◽

Olea Europaea L ◽

Hydrolysis Of ◽

Olea Europaéa

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Enhancement of Bioactive Compounds and Antioxidant Activities of Olive (Olea europaea L.) Leaf Extract by Instant Controlled Pressure Drop

Food and Bioprocess Technology ◽

10.1007/s11947-018-2098-1 ◽

2018 ◽

Vol 11 (6) ◽

pp. 1222-1229 ◽

Cited By ~ 2

Author(s):

Sameh Mkaouar ◽

Fatma Krichen ◽

Neila Bahloul ◽

Karim Allaf ◽

Nabil Kechaou

Keyword(s):

Pressure Drop ◽

Bioactive Compounds ◽

Olea Europaea ◽

Leaf Extract ◽

Antioxidant Activities ◽

Olea Europaea L ◽

Instant Controlled Pressure Drop ◽

Olea Europaéa

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Total Phenolic content, Antioxidant and Anticorrosive Activities of Olea europaea L. and Eucalyptus globulus Cultivated in Tunisian Arid Zones on Steel Rebar’s in Alkaline Chloride Solution

International Journal of Electrochemical Science ◽

10.20964/2019.08.65 ◽

2019 ◽

pp. 7529-7547

Author(s):

Marwa Trimeche ◽

Keyword(s):

Total Phenolic Content ◽

Eucalyptus Globulus ◽

Olea Europaea ◽

Chloride Solution ◽

Phenolic Content ◽

Total Phenolic ◽

Arid Zones ◽

Olea Europaea L ◽

Olea Europaéa

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Olive Leaves Extract from Algerian Oleaster (Olea europaea var. sylvestris) on Microbiological Safety and Shelf-life Stability of Raw Halal Minced Beef during Display

Foods ◽

10.3390/foods8010010 ◽

2018 ◽

Vol 8 (1) ◽

pp. 10 ◽

Cited By ~ 10

Author(s):

Djamel Djenane ◽

Diego Gómez ◽

Javier Yangüela ◽

Pedro Roncalés ◽

Agustín Ariño

Keyword(s):

Shelf Life ◽

Olea Europaea ◽

Thiobarbituric Acid ◽

Total Phenolic ◽

Array Detector ◽

Thiobarbituric Acid Reactive Substance ◽

Leaf Extracts ◽

Minced Beef ◽

Retail Display ◽

Olea Europaéa

Oleaster (wild olive tree) by-products represent a renewable and low-cost source of biopolyphenols. Leaf extracts (sylv.OLE) of Algerian oleaster, locally called a’hachad (Olea europaea subsp. europaea var. sylvestris), were applied at 1 and 5% (v/w) to raw Halal minced beef (HMB) in order to test its safety and shelf-life prolongation during retail/display. The total phenolic compound content in the extract was 198.7 ± 3.6 mg gallic acid equivalent. Ten compounds were identified in the sylv.OLE by High Performance Liquid Chromatography/Diode Array Detector (HPLC/DAD), of which oleuropein was the most abundant (43.25%). Samples treated with 5% sylv.OLE had significantly higher antimicrobial and antioxidant effects than those treated with 1% extract (p < 0.05). The addition of sylv.OLE reduced psychrotrophic counts as well as the level of pathogens (Salmonella enterica ser. Enteritidis and Shiga toxin-producing Escherichia coli O157:H7). A thiobarbituric acid reactive substance (TBARS) value of 2.42 ± 0.11 was reached throughout six days of retail/display in control samples, while the addition of 5% sylv.OLE reduced TBARS value by 58% (p < 0.05). The presence of sylv.OLE at the tested concentrations did not negatively influence the overall acceptability and bitterness of HMB.

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Combined Effect on Antioxidant Properties of Gymnema Sylvestre and Combretum Micranthum Leaf Extracts and the Relationship to Hypoglycemia

European Scientific Journal ESJ ◽

10.19044/esj.2017.v13n36p266 ◽

2017 ◽

Vol 13 (36) ◽

pp. 266 ◽

Cited By ~ 1

Author(s):

Ibrahim A. ◽

Onyike E. ◽

Nok A.J. ◽

Umar I.A.

Keyword(s):

Antioxidant Activities ◽

Fasting Blood Glucose ◽

Antioxidant Properties ◽

Radical Scavenging ◽

Total Phenolic ◽

Gymnema Sylvestre ◽

Leaf Extracts ◽

Antioxidant Power ◽

Combretum Micranthum ◽

The Relationship

Gymnema sylvestre R.Br. (“periploca of the woods” in English; “Kafi suga” in Hausa) (Asclepiadaceae) and Combretum micranthum, Fam. (Géézà in Hausa) (Combretaceae)) are used in combination for the management of diabetes mellitus (DM) in the North-Eastern part of Nigeria with little or no scientific basis. It is thus the aim of this research to validate the anti-diabetic activities of G. sylvestre (GS) and C. micranthum (CM) leaf extracts, individually and in combined form (GSCM) as well as look at the relationship between antioxidant capacity and anti-hyperglycemic potential of these plants. The study assayed for anti-diabetic potential by following fasting blood glucose (FBG). Levels of liver catalase (CAT), malondialdehyde (MDA), superoxide dismutase (SOD), reaction oxygen species (ROS), reduced glutathione (GSH), oxidized glutathione (GSSG) and glutathione peroxidase (GSH-Px), and radical scavenging activities of the plants were assayed for spectrophotometrically. GS and CM revealed good ferric reducing antioxidant power (FRAP) and radical scavenging activities against ABTS, DPPH and Nitric Oxide with C. micranthum being significantly better - both plants also showed good total flavonoids and total phenolic contents. The anti-hyperglycemic activities may be associated with flavonoids and phenolic compounds which act via radical scavenging/antioxidant properties of the plants’ extracts. In conclusion, G. sylvestre and C. micranthum aqueous leaf extracts showed significant (P < 0.05) hypoglycaemic activities both separately and in a 1:1 combination which has strong correlation with both in vitro and in vivo antioxidant activities of the plants’ extracts.

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