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Table 2 Factors and levels used in two-level fractional factorial design.

From: Exobiopolymer production of Ophiocordyceps dipterigenaBCC 2073: optimization, production in bioreactor and characterization

Factor Low level (-1) Center point (0) High level (+1)
A 20 40 60
B 6 10 14
C 0 1 2
D 0 1 2
E 25 27.5 30
  1. A = glucose (g·L-1), B = malt extract (g·L-1), C = vitamin solution (mL.L-1), D = trace element solution (mL.L-1), E = temperature (°C)