Optimization of Extraction Parameters of Phenolic Antioxidants from Leaves of Capparis spinosa Using Response Surface Methodology
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Optimization of antioxidant assay (2,2-dipheynl-1-picrylhydrazy (DPPH) scavenging assay), total phenol content (TPC), and total flavonoid content (TFC) from leaves of Capparis spinosa were investigated using response surface methodology (RSM). The conditions investigated were ethanol concentration (20–80 %, ethanol/water, v/v), extraction temperature (30–65 °C), and solvent to material ratio 20:50 (v/w). A rotatable Box–Behnken design (BBD) consisting of 15 experimental runs with three replicates at the center point were applied by second-order polynomial models. The results of RSM showed that the highest extraction efficiency was obtained in 49 % ethanol, 51.8 °C, and 50 (v/w) ratio of solvent to material. Under optimum conditions, the corresponding values for TPC, TFC, and antioxidant assay were 27.44 (mg gallic acid equivalent (GAE) g−1 dry weight (DW)), 26.07 (mg quercetin g−1 DW), and 85.74 (DPPHsc%), respectively. Comparison of predicted and observed data through the chi-square (X 2) values demonstrated that RSM models was useful for predicting of responses. In addition, the higher R 2 values (R 2 > 0.998) showed that models could efficiently predict the yield of responses.
KeywordsRSM Total phenol content Total flavonoid Antioxidant assay Optimization
The work was performed in the Department of Horticulture of Urmia University.
This study was funded by Urmia University.
Compliance with Ethical Standards
Conflict of Interest
Mohammad Fattahi declares that he has no conflict of interest. Rahimeh Rahimi declares that he has no conflict of interest.
This article does not contain any studies with human participants performed by any of the authors.
Publication has been approved by all individual participants.
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