highly significantP < .05
From the analysis of variance (ANOVA), the model of specific activity β -glucosidase was highly significant ( P < .05; Table 4 ) and the R 2 value for the model, being the measure of the goodness of fit of the model, was 0.709, which indicated that 70.90% of the total variations in the observed response values could be explained by the model, or by experimental parameters and their interactions.