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

Figure 4

Response surface showing the interaction between five parameters and C/N; (a) sucrose and NaNO₃, (b) sucrose and Triton X-100, (c) yeast extract and Zn⁺², and (d) NaNO₃ and Triton X-100. Other variables are constant at their center points. The numbers inside the contour plots indicate the C/N.

(a)

(b)

(c)

(d)