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

In this work, the effect of Détente Instantanée Contrôlée (DIC) (French for instant controlled pressure drop) on the total polyphenol, flavonoids, α-tocopherol contents, and antioxidant activities of olive leaves was studied. Olive leaf extracts were pre-treated at one cycle DIC under 0.1 MPa pressu...

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Bibliographic Details
Published in:Food and bioprocess technology 2018-06, Vol.11 (6), p.1222-1229
Main Authors: Mkaouar, Sameh, Krichen, Fatma, Bahloul, Neila, Allaf, Karim, Kechaou, Nabil
Format: Article
Language:English
Subjects:
Agriculture
Antioxidants
Bioactive compounds
Biological activity
Biotechnology
Butylated hydroxytoluene
Catechin
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Equivalence
Ethanol
Flavonoids
Food Science
Gallic acid
Leaves
Oleuropein
Original Paper
Phenolic compounds
Phenols
Plant extracts
Pressure
Pressure drop
Tocopherol
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Summary:In this work, the effect of Détente Instantanée Contrôlée (DIC) (French for instant controlled pressure drop) on the total polyphenol, flavonoids, α-tocopherol contents, and antioxidant activities of olive leaves was studied. Olive leaf extracts were pre-treated at one cycle DIC under 0.1 MPa pressure for 11 s and followed by an extraction with 95% ethanol at 55 °C during 3 h. The phenolic compounds, flavonoïds, oleuropein, and α-tocopherol contents were determined, showing 66.63 mg gallic acid equivalent (GAE)/g db, 12 mg catechin equivalent (CE)/g db, 43.9 mg/g db, and 0.15 mg/g db for the untreated leaves against 239.37 mg GAE/g db, 28 mg CE/g db, 70.3 mg/g db, and 0.59 mg/g db for DIC-treated leaves, respectively. Therefore, DIC allows more availability of bioactive compounds contributing to a high antiradical activity (DPPH) compared to a synthetic antioxidant butylated hydroxytoluene (BHT). Both extracts showed a total antioxidant capacity (method of phosphomolybdenum) greater than that of the standard BHT. Likewise, both extracts have a reducing power (FRAP test) significant concentration-dependent. The DIC-treated leaves showed a higher antioxidant capacity compared to that of untreated leaves. Thus, DIC could be an effective treatment to promote the extraction of bioactive molecules of high antioxidant activities from olive leaves.
ISSN:1935-5130
1935-5149
DOI:10.1007/s11947-018-2098-1