Journal
JOURNAL OF POLYMERS AND THE ENVIRONMENT
Volume 30, Issue 5, Pages 1787-1802Publisher
SPRINGER
DOI: 10.1007/s10924-021-02308-x
Keywords
Bioactive film; Taguchi method; Grey relational analysis; Multiple response optimization; Antibacterial activity
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Funding
- Institute of Research and Development, Rajamangala University of Technology Rattanakosin
- Applied Engineering for Important Crops of the North East Research Group, Khon Kaen University, Thailand
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The study found that by incorporating substances such as glycerol, citric acid and zinc oxide into poly(vinyl alcohol)/starch films, it can enhance antibacterial activity and improve moisture barrier properties, maintaining the quality of fresh food and extending shelf life.
In this work, the incorporation of additives i.e. glycerol, citric acid and zinc oxide at four-levels into poly(vinyl alcohol)/starch (PSt) films containing extracted spent coffee ground (ex-SCG) was designed and optimized using Taguchi method combined with Grey relational analysis. Citric acid was the most significant parameter affecting the antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). Addition of glycerol in PSt films enhanced water resistance and biodegradability of the samples, but decreased their tensile strength and modulus values. The presence of ZnO increased the tensile strength of PSt films. The Grey relational analysis showed that the optimal mix proportion for PSt film could be achieved at 10 wt% glycerol, 45 wt% citric acid and 1 wt% ZnO. The PSt films based on the optimized mix proportion of additives were used as packaging for fresh cherry tomatoes. The films remarkably inhibited growth of bacteria and maintained freshness of the packaged cherry tomatoes. Based on the finding in this work, experimentally made PSt films could have a potential for food preservation and antimicrobial packaging applications to enhance the quality and to extend the shelf-life of fresh fruits and vegetables.
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