Title : Evaluation of different extraction methods on the phenolic profile and the antioxidant potential of ceratonia siliqua L. pods extracts
The present work was designed to investigate the effects of different extraction processes, namely ultrasonic-assisted, supercritical fluid, microwave-assisted and Soxhlet applied to carob pods. The total phenolic quantification and the antioxidant activity were assessed by the means of rapid in vitro spectrophotometric assays; the phenolic profile was identified using ultra-high performance liquid chromatography coupled to mass spectrometry. The results revealed that the phenolic compounds and the antioxidant capacity varied significantly with the nature of the extraction process. The content of total phenolic compounds ranged from 11.55 to 34.38 mg GAE/g DW; the content of total flavonoids varied from 3.50 to 10.53 mg QE/g DW, and the content of condensed tannins fluctuated from 3.30 to 6.55 mg CE/ g DW. All extracts performed differently on antioxidant activity when determined by the DPPH assay producing a dose-dependent response, with IC50 extended from 11.33 to 6.07 µg/mL. HPLC analysis enabled the identification of nine compounds. As a function of the studied extraction methods, the phenolic compound contents were positively correlated with antioxidant activity.
Audience Takeaway Notes:
- The present work aims to highlight the effect of different extraction methods (microwave-assisted extraction, supercritical fluid extraction, ultrasonic-assisted extraction, and Soxhlet extraction) for carob pods on the concentration of phenolic compounds.
- The efficiency of the extraction was determined by considering the total phenolic compounds concentration for carob pods on the concentration of phenolic compounds, along with an evaluation of the antioxidant potential via in vitro spectrophotometric assays of the different obtained extracts; in addition, the phytochemical profile was performed by high-performance liquid chromatography (HPLC).