Antioxidant capacity and release kinetics of active film based on sodium caseinate and gallic acid

In this study, sodium caseinate film was developed through solution casting method. Release kinetics of gallic acid was elucidated into the food simulant (95% ethanol). The IC50 of gallic acid in terms of DPPH radical scavenging activity was observed to be 30.67 µg/ml, whereas the maximum radical scavenging activity was observed to be ~57%. Furthermore, approximately 26% of the gallic acid was released from the packaging into the simulant. A mathematical model was used to describe the diffusion of gallic acid from the packaging material, which will provide essential information on developing packaging materials based on sodium caseinate to reach the best engineering solution by keeping in view the regulatory constraints on the leeching phenomenon.