Figure 3.5. 2D Contour plot of the interaction of reaction time (hr) &
lipase weight (%w/w)
The response surface model with the incorporation of the second order
effects of non-linear relationships was the technique used to determine
the best possible combinations of variables to predict the yield of
tocopherols in this study. The grided surface plots shown in Figures 3.6
to 3.8 are the representations of the surface plot in 3-D space.
According to Soumya (2017), the plots determining the optimum operating
conditions reaching maximum from the best-fitted model with a map of
contour lines, follow a direction of movement along the path of maximum
response. Hence, for the response surface plots, responses are derived
from the peak of the contour surfaces with respect to two underlying
variables at a particular instaance as shown in Fig. 3.6, 3.7 and 3.8
respectively.