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Bioresources and Bioprocessing

Table 1 Box–Behnken experimental design

From: Optimization of tannase production by Aspergillus glaucus in solid-state fermentation of black tea waste

Factor

Name

Minimum

Maximum

X1

Moisture ratio %

30

100

X2

Initial pH

4.0

8.0

X3

Substrate concentration (g/L)

3.0

9.0

X4

Sodium nitrate concentration %

0.2

1.0

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