Optimization of blending apple (Malus × domestica) bars using response surface methodology

Firm ripe apple fruits mature and healthy red delicious apple variety was bought from the local market used for the study. Apple contains higher antioxidant compounds. It has the potential to be used as a healthy food. For the optimization of apple bar by response surface methodology, the experiments were conducted according to Central Composite Rotatable Design (CCRD) with three variables at five levels.