Optimization of polyphenolic compounds from Gossampinus malabarica flowers by microwave-assisted extraction technology

Abstract

This study investigates the optimization of microwave-assisted extraction (MAE) condition for phenolic antioxidants from Gossampinus malabarica flowers by response surface methodology (RSM) using a central composite design (CCD). The best combinations of microwave power (MP), solid to liquid (S-L) ratio, ethanol concentration and time were identified through MAE using RSM from G. malabarica flowers. The manipulation of process variables significantly influenced the extraction of bioactive compounds (BCs), with the MP and S-L ratio demonstrating high significance in the extraction of BCs. The optimized extraction conditions consisted of an MP of 1,000 W, a S-L ratio of 1:100, an ethanol concentration of 20 % (w/v), and an extraction time of 20 s, resulting in the highest extraction yield, extractable phenolic compounds, DPPH antioxidant activity and total flavonoid content. The actual experimental results are closely associated with the predicted values, affirming the efficacy of RSM in optimizing the phenolic extraction process from G. malabarica flowers.