Fig. 2From: Effects of temperature, time, and solvent ratio on the extraction of phenolic compounds and the anti-radical activity of Clinacanthus nutans Lindau leaves by response surface methodologyResponse surface plots; a–c the interaction effect of extraction yield as a function of extraction temperature, extraction time and solvent ratio, d–f the interaction effect of DPPH radical scavenging activity as a function of extraction temperature, extraction time and solvent ratio and g–i the interaction effect of TPC as a function of extraction temperature, extraction time and solvent ratioBack to article page