Polyvinyl Alcohol (PVA)/Starch Bioactive Packaging Film Enriched with Antioxidants from Spent Coffee Ground and Citric Acid |
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| Authors: | Artjima Ounkaew Pornnapa Kasemsiri Khanita Kamwilaisak Khwantri Saengprachatanarug Wiyada Mongkolthanaruk Mutjarin Souvanh Uraiwan Pongsa Prinya Chindaprasirt |
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| Institution: | 1.Sustainable Infrastructure Research and Development Center and Department of Chemical Engineering, Faculty of Engineering,Khon Kaen University,Khon Kaen,Thailand;2.Department of Agricultural Engineering, Faculty of Engineering,Khon Kaen University,Khon Kaen,Thailand;3.Department of Microbiology, Faculty of Science,Khon Kaen University,Khon Kaen,Thailand;4.Division of Industrial Engineering Technology, Faculty of Industry and Technology,Rajamangala University of Technology,Hua Hin,Thailand;5.Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering,Khon Kaen University,Khon Kaen,Thailand |
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| Abstract: | The bioactive packaging polyvinyl alcohol (PVA)/starch films were prepared by incorporating combined antioxidant agents i.e. extracted spent coffee ground (ex-SCG) and citric acid. Effect of citric acid content on chemical compatibility, releasing of antioxidant, antibacterial activities, and physical and mechanical properties of PVA/starch incorporated ex-SCG (PSt-E) films was studied. The results of ATR-FTIR spectra showed that antioxidant agents of ex-SCG can penetrate into the film and the ester bond of blended films by citric acid was also observed. The presence of ex-SCG increased efficiency of antioxidant release and antimicrobial activity. The PSt-E film incorporated 30 wt% citric acid showed minimum inhibitory concentration against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The incorporation of ex-SCG and citric acid into film showed a synergistic effect on antibacterial activity. The water resistance and kinetic moisture sorption improved with incorporation of citric acid. The tensile strength and biodegradability of samples were in range of 5.63–7.44 MPa and 65.28–86.64%, respectively. Based on this study, PSt-E film incorporated 30 wt% citric acid can be applied as novel food packaging materials. |
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