2.3.2. Experimental design and statistical data analysis
The rotatable central composite design was applied to identify the influence of two variables, the applied voltage (V) and the total solids content of the blueberry pulp (g/100 g), on the percentage of anthocyanin degradation (response variable). The coded and uncoded independent variables used in the experimental design are listed in Table 1. Voltage ranges (X1) were selected based on the limitations of the ohmic heating system, and the range of the solids content (X2) was chosen based on the characteristics of the fruit and the stability of the diluted suspension. To determine the influence of the selected parameters on the response variable, experiments were planned according to the central composite design (CCD) using a 22 full factorial and star design with three central points, as shown in Table 2. For the ohmic heating experiments, the error between independent experiments was determined using the central points of the rotatable central composite design.
2.3.2. Experimental design and statistical data analysis
The rotatable central composite design was applied to identify the influence of two variables, the applied voltage (V) and the total solids content of the blueberry pulp (g/100 g), on the percentage of anthocyanin degradation (response variable). The coded and uncoded independent variables used in the experimental design are listed in Table 1. Voltage ranges (X1) were selected based on the limitations of the ohmic heating system, and the range of the solids content (X2) was chosen based on the characteristics of the fruit and the stability of the diluted suspension. To determine the influence of the selected parameters on the response variable, experiments were planned according to the central composite design (CCD) using a 22 full factorial and star design with three central points, as shown in Table 2. For the ohmic heating experiments, the error between independent experiments was determined using the central points of the rotatable central composite design.
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