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Table 2 Low, medium and high levels of medium components affecting A. niger total enzyme activity and cell biomass in a BB design

From: Bioprocess optimization for pectinase production using Aspergillus niger in a submerged cultivation system

Factors Code Low level (−1) Middle (0) High level (+ 1)
Pectin (g/L) A 10.00 30.00 50.00
(NH4)2SO4 (g/L) B 1.00 3.50 6.00
K2HPO4 (g/L) C 0.50 1.25 2.00