Characterization of bioactive film from pectin incorporated with gamma-aminobutyric acid

Gamma-aminobutyric acid (GABA) is a nutritious bioactive compound that is also an antioxidant. The effect of GABA contents (5-15%) on pectin film properties were investigated and compared to those obtained by adding 10% glycerol, with pure pectin film as the control. The addition of 5% GABA led to similar film tensile strength and elastic modulus with lower film solubility and water vapor permeability compared with film plasticized with 10% glycerol. Additionally, 5% GABA had higher film flexibility compared with the control film. Moreover, GABA content slightly affected the color and moisture content of pectin films with a high antioxidant activity. Furthermore, thermal properties of film plasticized with GABA supported the changes in mechanical properties of pectin film. Therefore, this small amount of GABA provided a desirable film with functional properties similar to those obtained by using the higher amount of glycerol. Thus, GABA not only acted as an alternative plasticizer but also showed antioxidant activity as a bioactive film. (C) 2019 Elsevier B.V. All rights reserved.