Investigation of the physical and antioxidant properties of bacterial cellulose active film containing Scrophularia striata extract

The aim of this research was to study the physical and antioxidant properties of bacterial cellulose based active films containing Scrophularia striata extract. The effect of β-cyclodextrine (β-CD) and lamination process
was investigated on the properties of films. Results showed that the laminated films had the highest thickness. Water solubility of the films was increased by incorporation of the extract, but this property was decreased after lamination. Moisture uptake and water vapour permeability were decreased by β-CD inclusion and lamination process. a value, Yellowness index and total colour difference were increased significantly by addition of extract (p ≤ 0.05). But the effect of β-CD and lamination was not significant on colour properties. β-CD containing three-layer film had the highest tensile strength (15.11 MPa) and Young modulus (13945 MPa). Bacterial cellulose film containing extract showed a good DPPH radical scavenging activity (54.5%), but lamination process caused to decrease the antioxidant activity. Generally complex formation of extract with β-CD and also lamination was able to decrease the negative effects of extract on physical properties of bacterial cellulose film and to fabricate an active film with high antioxidant activity.