Received: 28-03-2022
Accepted: 21-10-2022
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Enhancing the Antimicrobial Activity of Pectin-Alginate Biofilm and its Application in Preservation of Fresh Passion Fruits (Passiflora edulisSims)
,
Nguyen Thi Thu Nga
1
,
Hoang Thi Minh Nguyet
1
,
Nguyen Thi Bich Thuy
1
Keywords
Pectin, alginate, nanobubbles, chlorine, biofilm, passion fruits
Abstract
The present study was aimed to enhance the antimicrobial activity of Pec-Alg film-forming solution. Nanobubbles (NBs), cinnamon essential oil (Cinna) and chlorine (Chlo) were three potential substances added to Pec-Alg solutions. The microbial inhibitory effect was evaluated in vitro, and the Pec-Alg solutions were directly applied to passion fruits to evaluate the antimicrobial effect, the rate of disease transmission during storage, and the quality changes of passion fruit through physiological, mechanical and biochemical parameters. The results showed that the solutions of Pec-Alg supplemented with NBs or Cinna or Chlo all had high inhibitory effect in vitro conditions with 86.7%, 74.1% and 93.6%, respectively. Moreover, they had a positive inhibitory effect on microorganisms on passion fruits in the following order: Pec-Alg-Chlo > Pec-Alg-NBs > Pec-Alg-Cinna, of which Pec-Alg-Chlo solution had the highest inhibitory effect, reaching 84.4% at 1 hour after coating and 43.6% after 30 days of storage.They were also significantly effective to limit the rate of disease transmission during storage, contributing to prolong the shelf life of passion fruits up to 33 days, which means an increase of 15 days compared to the control and an increase of 9 days compared to Pec-Alg coating without addition ofany antimicrobial agents.
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