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Table 5 Predicted levels of extraction condition for the maximum response of extraction conditions by the ridge analysis in Zea mays L.

From: Optimization of extraction parameters of PTP1β (protein tyrosine phosphatase 1β), inhibitory polyphenols, and anthocyanins from Zea mays L. using response surface methodology (RSM)

Response variables Optimum extraction conditionsa Maximum Morphology
X1 X2 X3 X4
Total polyphenol content (mg GAE/g) 29.02 8.99 33.67 10.25 7.89 Saddle point
Total anthocyanin content (mg C3GE/100 g) 45.22 7.85 34.14 22.97 82.44 Saddle point
Extraction yield (%) 58.87 7.53 32.31 17.65 10.33 Saddle point
  1. aX1, extraction temperature (°C); X2, extraction time (hour); X3, solid-liquid ratio (%); X4, solvent volume (1:X)