Table 4 Box–Behnken design of experimental parameter levels.

From: Extraction and antioxidant activity of total triterpenoids in the mycelium of a medicinal fungus, Sanghuangporus sanghuang

Parameter

Coding level

−1

0

1

Ethanol concentration X1/%

70

80

90

Ultrasonic time X2/min

15

20

25

Ultrasonic temperature X3/°C

50

60

70

Back to article page