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Polyphenolic Extract Activated Keratin Starch Coating: Fabrication, Characterization & Antifungal Evaluation

03/17/2022

Today, the application of protein-based bio-composite edible films in postharvest preservation of food and agricultural products is attracting increased attention due to their biodegradability, eco-friendliness and sustainability. In their study, Oluba et al., fabricated an avocado pear peel polyphenolic extract enriched keratin-starch composite film, characterized and evaluated for antimicrobial activity against fungal infected tomato fruits after 6 days of storage at room (25 ± 2 °C) temperature.

Polyphenolic Extract Activated Keratin Starch Coating Fabrication Characterization  Antifungal Evaluation

SEM images of keratin-starch films functionalized with avocado pear peel polyphenolic peel extract. 

They obtained the following results:

  1.  Successful film formation with high degree of compatibility and homogeneity.
  2. 6-day post-coating, Loss in weight of the coated tomato fruits decreased significantly with increasing extract concentration while titratable acidity showed a significant increase with increasing extract load.
  3. Higher ascorbic acid and lycopene contents in the avocado pear peel polyphenolic extract-loaded films.
  4. No significant effect in catechol oxidase activity of the tomato extract across the different treatment groups.
  5. Fungal growth inhibition showed a dose dependent increase consistent with avocado pear peel polyphenolic load in coated tomato fruits compared to control.

In summary, polyphenolic activated keratin-starch coating was able to reduce spoilage-induce weight loss as well as conserve the overall quality of fungal-infected tomato fruit and reduce microbial growth.

Therefore polyphenolic activated keratin-starch coating could serve as a sustainable and ecofriendly postharvest preservation method to prolong the shelf life of tomato fruits.

You can learn more about this study here.

Join us in Polyphenols Applications 2022 where the possible implication of polyphenols in agriculture will be discussed.