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Table 6 Independent variables and their levels for D-optimal design of the hydrolysis reaction

From: Hydrolysis optimization and characterization study of preparing fatty acids from Jatropha curcasseed oil

Independent variables   Variable levels
   -1 0 1
KOH (M) X 1 1 1.5 2
Temperature (°C) X 2 50 60 70
Time (h) X 3 1.5 2 2.5