Effect of C/N Ratio and Media Optimization through Response Surface Methodology on Simultaneous Productions of Intra- and Extracellular Inulinase and Invertase from Aspergillus niger ATCC 20611

Table 1

Range and levels of experimental variables.

Factors	Level of factors
	Low (−)	Medium (0)	High (+)
Sucrose (A/(w/v))	4.0	10	16
Yeast extract (B/(w/v))	1.0	2.5	4.0
NaNO3 (C/(w/v))	1.0	2.0	3.0
Zn^+2 (D/(v/v))	1.0	1.5	2.0
Triton X-100 (E/(v/v))	0.5	1.0	1.5