Optimisation of extraction conditions of phenolic compounds and antioxidant activity of Ruta chalepensis L. using response surface methodology
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In the present study, the extraction conditions of phenolic compounds from the Ruta chalepensis L. (a medicinal plant) and the antioxidant activity of its extract were determined. The response surface methodology (RSM) flowing Box–Behnken design was used to study and optimise the effect of three factors [ethanol concentration (40–80%), sample to solvent ratio (0.05/10–0.5/10 g/mL) and extraction time (30–90 min)] on the total phenolic content (TPC) and the antioxidant activity (AA). The optimal extraction conditions predicted by the models were 50.33%, 0.28 g/10 mL, and 59.86 min for the ethanol concentration, the sample to solvent ratio and the extraction time, respectively. These factors gave the optimal predicted values of 521.10 mg GAE/g DW and of 60.48 mg AAE/g DW for the total phenolic content and the antioxidant activity, respectively. Total flavonoids (TFC), flavonols (TFlC), and ortho-diphenols (ODC) contents were further determined by evaluating the extract obtained by the validated optimal conditions of phenolic compounds. The obtained contents were 129.72 ± 1.09 mg QE/g DW, 24.98 ± 0.38 mg RE/g DW and 45.93 ± 0.37 mg CAE/g DW for TFC, TFlC, and ODC, respectively. The data of this report revealed that the extract of Ruta chalepensis L. is an excellent source of natural antioxidants that can be used or incorporated, as natural additives, into different food products in order to develop novel functional food products.
KeywordsAntioxidant activity Box–Behnken design Optimisation Phenolic compounds Response surface methodology Ruta chalpensis L.
The authors are grateful to the Algerian Ministry of Higher Education and Scientific Research for the financial support. They would also convey special thanks to Dr. Mohamed El-Hadef El-Okki for his valuable help concerning the response surface methodology modelling and to Dr. Mohammed Gagaoua for his support in the scientific opinion and English editing of the manuscript as well as Mrs. Lamia Elmechta for her grammar checking.
Compliance with ethical standards
Conflict of interest
The authors declare that there are no conflict of interest.
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