Τίτλος:
An integrated process for the recovery of high added-value compounds from olive oil using solid support free liquid-liquid extraction and chromatography techniques
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
An integrated extraction and purification process for the direct recovery of high added value compounds from extra virgin olive oil (EVOO) is proposed by using solid support free liquid-liquid extraction and chromatography techniques. Two different extraction methods were developed on a laboratory-scale Centrifugal Partition Extractor (CPE): a sequential strategy consisting of several “extraction-recovery” cycles and a continuous strategy based on stationary phase co-current elution. In both cases, EVOO was used as mobile phase diluted in food grade n-hexane (feed mobile phase) and the required biphasic system was obtained by adding ethanol and water as polar solvents. For the sequential process, 17.5 L of feed EVOO containing organic phase (i.e. 7 L of EVOO treated) were extracted yielding 9.5 g of total phenolic fraction corresponding to a productivity of 5.8 g/h/L of CPE column. Regarding the second approach, the co-current process, 2 L of the feed oil phase (containing to 0.8 L of EVOO) were treated at 100 mL/min yielding 1.03 g of total phenolic fraction corresponding to a productivity of 8.9 g/h/L of CPE column. The total phenolic fraction was then fractionated by using stepwise gradient elution Centrifugal Partition Chromatography (CPC). The biphasic solvent systems were composed of n-hexane, ethyl acetate, ethanol and water in different proportions (X/Y/2/3, v/v). In a single run of 4 h on a column with a capacity of 1L, 910 mg of oleocanthal, 882 mg of oleacein, 104 mg of hydroxytyrosol were successfully recovered from 5 g of phenolic extract with purities of 85%, 92% and 90%, respectively. CPC fractions were then submitted to orthogonal chromatographic steps (adsorption on silica gel or size exclusion chromatography) leading to the isolation of additional eleven compounds belonging to triterpens, phenolic compounds and secoiridoids. Among them, elenolic acid ethylester was found to be new compound. Thin Layer Chromatography (TLC), Nuclear magnetic Resonance (NMR) and High Performance Liquid Chromatography – Diode Array Detector (HPLC-DAD) were used for monitoring and evaluation purposes throughout the entire procedure. © 2017 Elsevier B.V.
Συγγραφείς:
Angelis, A.
Hamzaoui, M.
Aligiannis, N.
Nikou, T.
Michailidis, D.
Gerolimatos, P.
Termentzi, A.
Hubert, J.
Halabalaki, M.
Renault, J.-H.
Skaltsounis, A.-L.
Περιοδικό:
Journal of Chromatography A
Λέξεις-κλειδιά:
Centrifugation; Chromatography; Ethanol; Hexane; High performance liquid chromatography; Liquid chromatography; Liquids; Nuclear magnetic resonance; Oils and fats; Olive oil; Organic solvents; Productivity; Recovery; Silica gel; Size exclusion chromatography; Solvent extraction; Thin layer chromatography, Centrifugal partition extraction (CPE)/chromatography (CPC); Co currents; Extra virgin olive oil; Hydroxytyrosol; Oleacein; Oleocanthal, Extraction, 1 acetoxypinoresinol; elenolic acid; extra virgin olive oil; hydroxytyrosol; maslinic acid; oleacein; oleanolic acid; oleocanthal; secoiridoid; sitosterol; triterpene; tyrosol; unclassified drug; olive oil; phenol derivative, Article; centrifugal partition chromatography; chromatography; controlled study; drug determination; drug isolation; drug purification; drug structure; high performance liquid chromatography; liquid liquid extraction; nuclear magnetic resonance; size exclusion chromatography; thin layer chromatography; chemistry; isolation and purification; liquid chromatography; liquid liquid extraction; procedures, Chromatography, Liquid; Liquid-Liquid Extraction; Olive Oil; Phenols
DOI:
10.1016/j.chroma.2017.02.046
