Table 4 Optimum conditions for total polyphenol content, total flavonoid content, DPPH radical scavenging of
Hordeum vulgare
L. extracts by superimposing their four-dimensional response surface graphs4
MAE conditions
Optimal ranges
Predicted optimal condition
Ethanol concentration (%)
30-50
40
Microwave power (W)
0-240
120
Extraction time (min)
16-20
18