Table 3.

Coefficient of variables in the model and their corresponding R ² values

Variables	Gelatin yield	Gel strength	Melting point
B0	17.130	408.5	23.433
X1	2.508	642.067*	6.0
X2	−0.007	0.954	0.0094
X3	0.049*	0.615	0.2667
X4	0.113*	4.282	−0.0678
X12	0.378	−18.375	−1.062**
X13	−0.586*	−15.744	−0.538
X14	-----	22.587	0.588*
X23	-----	19.079	-------
X24	0.549*	17.948	0.277
X34	−0.694**	17.602	--------
X1 2	0.174	−26.146*	−0.262
X2 2	−0.903***	−44.288**	−0.354
X3 2	−0.430*	−55.896***	−1.0**
X4 2	0.378*	−50.692***	−0.573*
R2	0.867	0.837	0.765
P Value	0.0003***	0.007**	0.01*

^*Significant at P < 0.05, ^**Significant at P < 0.01, ^***Significant at P < 0.001, b₀ = model constant, X₁ = Concentration of NaOH (%), X₂ = Soaking time (min.), X₃ = Extraction temperature (°C), X₄ = Extraction time (h)