Table 3.
Polynomial equation calculated by RSM for spray drying of Sikhye

Responses The second order polynomial1) R2 P value
Water uptake (g) Y1 = -0.012106 - 0.000265X1 + 0.000250X2 + 0.000844X3 - 0.000011500X1 2 + 0.000002500X2X1 - 0.00000000625X2 2 - 0.000000667X3X1 - 0.000000167X3X2 - 0.000012667X3 2 0.9692 0.0007
Solubility (%) Y2 = 13.549494 + 3.826078X1 + 0.457426X2 + 0.424220X3 - 0.145287X1 2 + 0.011879X2X1 - 0.005364X2 2 + 0.021673X3X2 - 0.042059X3 3 0.9157 0.0038
Particle size (μm) Y3 = 59.034028 + 0.450083X1 + 0.057847X2 - 2.350111X3 - 0.004167X1 2 - 0.001267X2X1 - 0.000416X2 2 + 0.002267X3X2 + 0.018283X3 2 0.9706 0.0001
Y = bo+b1X1+b2X2+b3X3+b11X1 2+b21X2X1+b22X2 2+b31X3X1+b32X3X2+b33X3 2.