scholarly journals 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

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

Assessment of Total Phenolic Content and Antioxidant Activity of Ficus carica and Olea europaea L. Leaves Extracts

2019 ◽  
Vol 15 (6) ◽  
pp. 583-587
Author(s):  
Abderrahim Benslama ◽  
Amirouche Deghima ◽  
Nadjat Righi
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Capacity ◽  
Total Phenolic Content ◽  
Olea Europaea ◽  
Phenolic Content ◽  
Pharmaceutical Preparation ◽  
Reducing Power ◽  
Ficus Carica ◽  
Total Phenolic ◽  
Olea Europaéa

Background: Ficus carica and Olea europaea are two medicinal plants which are widely distributed in Algeria, and used in food and traditional medicine. Objective: The objective of this work is the evaluation of the antioxidant capacity of different extracts of F. carica and O. europaea, for ends of flora valorization in Algeria. Methods: The dried leaves of the concerned plants Ficus carica and Olea europaea were submitted to sequential extraction with solvents of increasing polarity to give hexane, chloroform, ethyl acetate and methanolic extracts. The total phenolic and flavonoids were determined spectrophoto-metrically. The antioxidant activity of extracts was evaluated using 1,1’-Diphenyl-1-Picrylhydrazyl (DPPH) radicalscavenging and ferric reducing power test. Results: The results of the quantitative analysis show that the Methanolic Extract (ME) gives the highest yield with 16.43% and 19.98% for F. carica and O. europaea respectively. The analysis show that the highest amount of phenolic compounds was recorded in the ME of O. europaea (171.40±6.79 µg GAE/ mg E), when the the highest amount of flavonoids was recorded in the CHE of the F. carica (34.06± 0.05 µg QE/ mg E). In addition, the results show that the Ethyle Acetat Extract (EAE) exhibit the highest antiradical activity against DPPH free radical with an EC50=45.21±1.12 and 8.20±0.37 µg/ml for F. carica and O. europaea, respectively. Moreover, the EAE of the two plants present the highest reducing effect compared to other extracts at concentration of 200 µg/ml. Conclusion: The obtained results revealed the presence of a strong correlation between the antioxidant activity of the extract and its total phenolic content. Furthermore, they reported that the EAE have a considerable antioxidant capacity. This can be considered as an alternate natural source of antioxidants used generally as additives in food and pharmaceutical preparation.

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

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1998 ◽  
Author(s):  
Francesca Nicolì ◽  
Carmine Negro ◽  
Marzia Vergine ◽  
Alessio Aprile ◽  
Eliana Nutricati ◽  
...  
Keyword(s):  
Superoxide Anion ◽  
Olea Europaea ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Dry Weight ◽  
Total Phenolic ◽  
Therapeutic Effects ◽  
Leaf Extracts ◽  
Olea Europaea L ◽  
Olea Europaéa

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.

scholarly journals Formulation of a Phenol-Rich Extract from Unripe Olives (Olea europaea L.) in Microemulsion to Improve Its Solubility and Intestinal Permeability

Molecules ◽  
2020 ◽  
Vol 25 (14) ◽  
pp. 3198
Author(s):  
Lorenzo Cecchi ◽  
Vieri Piazzini ◽  
Mario D’Ambrosio ◽  
Cristina Luceri ◽  
Federica Rocco ◽  
...  
Keyword(s):  
Intestinal Permeability ◽  
Olea Europaea ◽  
Oral Delivery ◽  
Oral Dosage ◽  
Total Phenolic ◽  
Artificial Membrane ◽  
Olea Europaea L ◽  
Transport Studies ◽  
Permeability Assay ◽  
Olea Europaéa

The beneficial properties of phenolic compounds from Olea europaea L. are well-known. An olive extract (OE) was prepared from unripe olives (Moraiolo cultivar). The study aimed to formulate OE into a microemulsion (ME) in oral dosage form. OE was extracted from olives with EtOH:H2O (80:20) and characterized by HPLC-DAD. ME composition was stated by a solubility and pseudo-ternary diagram. The ME was chemically and physically characterized, and its stability at 4 °C was analyzed for three months. The ability of the formulation to ameliorate the solubility and the intestinal permeability of OE was evaluated by a Parallel Artificial Membrane Permeability Assay (PAMPA) assay and Caco-2 cells. The total phenolic content of the extract was 39% w/w. The main constituent was oleuropein (31.0%), together with ligstroside (3.1%) and verbascoside (2.4%). The ME was prepared using Capryol 90 as the oily phase, and Cremophor EL and Transcutol (2:1) as surfactant and co-surfactant, respectively. ME droplet size was 14.03 ± 1.36 nm, PdI 0.20 ± 0.08, ζ-potential −1.16 ± 0.48. Stability of ME was confirmed for at least three months. The formulation was loaded with 35 mg/mL of OE, increasing the solubility of the extract by about four times. The enhanced permeability of OE was evaluated by PAMPA, as demonstrated by the Pe value (1.44 ± 0.83 × 10−6 cm/s for OE hydroalcoholic solution, 3.74 ± 0.34 × 10−6 cm/s for OE-ME). Caco-2 cell transport studies confirmed the same results: Papp was 16.14 ± 0.05 × 10−6 cm/s for OE solution and 26.99 ± 0.45 × 10−6 cm/s for OE-ME. ME proved to be a suitable formulation for oral delivery.

scholarly journals Water as a Solvent of Election for Obtaining Oleuropein-Rich Extracts from Olive (Olea europaea) Leaves

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 465
Author(s):  
Julieta Ines Monteleone ◽  
Elisa Sperlinga ◽  
Laura Siracusa ◽  
Giovanni Spagna ◽  
Lucia Parafati ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Olea Europaea ◽  
Phenolic Content ◽  
Radical Scavenging ◽  
Water Extract ◽  
Hot Water ◽  
Total Phenolic ◽  
Human Consumption ◽  
Total Phenol Content ◽  
Olea Europaéa

Leaves from Olea europaea represent one of the main by-products of the olive oil industry, containing a plethora of bioactive compounds with several promising activities for human health. An organic solvent-free extraction method was developed for the recovery of olive leaf phenols, which obtained an extract containing oleuropein in high amounts. A comparison of various extraction media is reported, together with the total phenolic content, DPPH (2,2-Diphenyl-1-picrylhydrazyl) content, ORAC (oxygen radical absorbance capacity), and polyphenol oxidase activity of the corresponding extracts. The polyphenol profiles and content of the most representative extracts have also been studied. Extraction solvent and temperature significantly influenced the phenolic content and antioxidant activity of the extracts, with hot water representing the solvent of election for the extraction of bioactive compounds from this matrix. All the extracts obtained showed reasonably high total phenol content (TPC) and good DPPH radical scavenging activity; among them, the water extract is characterized by desirable traits and could be used for many industrial applications and human consumption.

LC-DAD-ESI-MS/MS, total phenolic content, and antioxidant activity of Firmiana simplex

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
MA Ghareeb ◽  
T Mohamed ◽  
AM Saad ◽  
LA Refahy ◽  
MA Sobeh ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenolic ◽  
Esi Ms
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