Degradation kinetics during storage of vitamins and antioxidants in coconut powder

Abstract

Degradation kinetic parameters in vitamins and antioxidants in coconut powder fortified with functionally active compounds (CP+FAC) during storage represents a valuable tool to predict the product’s shelf life. The aim of this research was to evaluate the degradation kinetics during storage of vitamins (C, D3, and E), total phenols, and properties associated to antioxidant activity. Vitamins were quantified via high-resolution liquid chromatography and the antioxidant activity through DPPH and ABTS free radical scavenging activity. An experimental design was used with two-factor factorial design: 1) storage time (tS) and 2) treatment: temperature (TA) - type of packaging (N2 and atmospheric air), where the dependent variables were adjusted to zero-, first-, and second-order kinetic models. In general, losses of FAC were significant with respect to the factors evaluated and their interactions, with minor changes at lower TA and packaged with N2, indicating that the degradation kinetics of the FAC is slower under these storage conditions. Increased storage temperature reduced FAC stability, where the Arrhenius equation was able to quantify the effect of temperature of the rate of deterioration reactions of the FAC.

Keywords

• coconut powder
• functionally active compounds
• storage conditions
• activation energy
• deterioration