Table 1 Coded and actual levels of independent variables used in BBD design.

From: Efficient extraction of oleoresin from Ferula gummosa roots by natural deep eutectic solvent and its structure and chemical characterizations

Independent variables

Symbol

Unit

levels

 − 1

0

1

Time

t

Hour

3

6

9

Temperature

T

°C

30

40

50

DES solvent

S

%

5

10

20

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