Development, Characterization, and Optimization of Protein Level in Date Bars Using Response Surface Methodology

Table 7

Regression coefficients for the models representing as a function of variations in the independent variables for fracturability of date bars and their respective 𝑅².

Terms of model equations	Days
	0	15	30	45	60	75	90
Constant	70.5340**	69.6997**	69.2231**	70.1477**	71.0520**	72.5183**	74.7418**
𝑋	0.0908	0.4879*	0.7661	0.5701*	0.5857*	0.4703*	0.3155*
𝑌	0.0816	0.7057*	1.2051	1.0154*	0.9146*	0.5800*	0.3175
𝑋×𝑋	−0.0008	−0.0340*	−0.0622	−0.0332*	−0.0349*	−0.0281*	−0.0349*
𝑌×𝑌	0.0070	−0.0741*	−0.1312	−0.0922*	−0.0736*	−0.0350	−0.0342
𝑋×𝑌	−0.0062	0.0067	0.0075	−0.0167	−0.0271	−0.0254	0.0167
𝑅^2	93.9%	96.5%	81.8%	96.4%	94.8%	93.7%	95.1%

*significant (𝑃<0.05); **highly significant (𝑃<0.01) 𝑋: whey protein concentrate 𝑌: vetch protein isolate.