Phenolic Compounds fromOlea europaeaL. Possess Antioxidant Activity and Inhibit Carbohydrate Metabolizing EnzymesIn Vitro

Abstract

Phenolic composition and biological activities of fruit extracts from Italian and Algerian Olea europaea L. cultivars were studied. Total phenolic and tannin contents were quantified in the extracts. Moreover 14 different phenolic compounds were identified, and their profiles showed remarkable quantitative differences among analysed extracts. Moreover antioxidant and enzymatic inhibition activities were studied. Three complementary assays were used to measure their antioxidant activities and consequently Relative Antioxidant Capacity Index (RACI) was used to compare and easily describe obtained results. Results showed that Chemlal, between Algerian cultivars, and Coratina, among Italian ones, had the highest RACI values. On the other hand all extracts and the most abundant phenolics were tested for their efficiency to inhibit α-amylase and α-glucosidase enzymes. Leccino, among all analysed cultivars, and luteolin, among identified phenolic compounds, were found to be the best inhibitors of α-amylase and α-glucosidase enzymes. Results demonstrated that Olea europaea fruit extracts can represent an important natural source with high antioxidant potential and significant α-amylase and α-glucosidase inhibitory effects.

Investigation of the Effects of Virgin Olive Oil Cleaning Systems on the Secoiridoid Aglycone Content Using High Performance Liquid Chromatography–Mass Spectrometry

“…The VOO stability against oxidation is due to its content of phenolic compounds (Dekdouk et al, ). In the present study, a direct quantification of each secoiridoid aglycone based on calibration curves was not possible, because no standard was available for the detected species.…”

Chemical analysis and antioxidant properties of orange‐tree (Citrus sinensis L.) biomass extracts obtained via different extraction techniques

“…The inhibition of lipid peroxidation of wood extracts was assayed by the BCB method . Butylated hydroxytoluene (BHT) was used as a positive control for the reaction.…”

Chemical Composition and Activity of Bark and Leaf Extracts of Pinus Halepensis and Olea Europaea Grown in Al-Jabel Al-Akhdar Region, Libya Against some Plant Phytopathogens

“…65 Recently, phenolic composition with tannin contents and their biological activities of fruit extracts from Italian and Algerian Olea europaea L. cultivars were studied. 40 Fourteen different phenolic compounds including hydroxytyrosol, tyrosol, p-hydroxybenzoic acid, and verbascoside as major constituents were identified, and their profiles showed remarkable quantitative differences among analyzed extracts. The authors reported that there were no significant qualitative differences among samples, but it is possible to note important quantitative differences.…”

“…28,[30][31][32][33][34][35][36][37][38] Recently, an increase interest in natural substances extracted from such plants has been observed in literatures due to their significant impact from an environmental point of view, as well as to find effective alternatives to the industrially synthesized chemicals. 3,[39][40][41][42] Therefore, the objective of this study was to analyze the chemical composition of acetone extracts of Pinus halepensis Mill (needles and bark) and Olea europaea L. (leaves and barks), collected from three levels of altitude in AL-Jabal AL-Akhder, Libya, using gas chromatography/mass spectrometry (GC/MS). The GC/MS is an analytical instrument that a hyphenated system of GC and MS and it is a very compatible technique and the most commonly used technique for the identification and quantification of different substances within a test sample.…”