Extraction kinetics modeling of antioxidants from grape stalk (Vitis vinifera var. Bobal): Influence of drying conditions

摘要: The use of antioxidant extracts obtained from natural products is highly relevant in the food, chemical and pharmaceutical industry. mathematical analysis extraction could contribute to a better understanding process fundamental for optimization tasks. However, high complexity matrixes makes modeling difficult. main aim this work was model grape stalk order quantify influence previous drying operation on kinetics. kinetics freeze dried hot air samples at several temperatures (40, 55, 70, 85, 100 115 °C) were carried out, using FRAP method measure capacity extracts. A diffusion developed that took significant external resistance as well complex geometry into consideration. From results, conditions concentration dry stalk, effective diffusivity mass transfer coefficient identified.