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The Scientific World Journal
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2020
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Article
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Tab 1
/
Research Article
Optimization of Ultrasound-Assisted Extraction of Polyphenol Content from
Zea mays
Hairs (Waste)
Table 1
Levels of variables for the experimental design.
Independent variable
Symbol
Coded levels
ā1
0
1
Ethanol/water (%)
X1
50
60
70
Solvent/material ratio (mL/g)
X2
10
15
20
Time (min)
X3
40
45
50