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Journal of Chemistry
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2021
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Article
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Tab 1
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Research Article
Ultrasound-Assisted Extraction of Phenolic Compounds from Moroccan
Lavandula stoechas
L.: Optimization Using Response Surface Methodology
Table 1
The selected factors and their levels in the Box–Behnken design.
Factors
Unity
Symbol
Factor level
−1
0
1
Extraction time
Min
X1
20
30
40
Solvent-to-material ratio
ml/g
X2
20
25
30
Ethanol
%
X3
40
60
80