Bio-nanocomposite edible coatings based on arrowroot starch/cellulose nanocrystals/carnauba wax nanoemulsion containing essential oils to preserve quality and improve shelf life of strawberry

Author(s)

de Oliveira Filho, Josemar Gonsalves ; Albiero, Beatriz Regina ; Calisto, Italo Henrique ; Bertolo, Mirella Romanelli Vicente ; Oldoni, Fernanda Campos Alencar ; Egea, Mariana Buranelo ; Bogusz Junior, Stanislau Bogusz ; de Azeredo, Henriette Monteiro Cordeiro de ; Ferreira, Marcos David

• Document type: Journal article
• Source: International Journal of Biological Macromolecules; v. 219, p. 12-pg., 2022-08-12.

Abstract

This study investigated the effects of bio-nanocomposite coatings developed using arrowroot starch (AA), cel-lulose nanocrystals (CNC), carnauba wax nanoemulsion (CWN), and Cymbopogon martinii and Mentha spicata essential oils (CEO and MEO, respectively) on the physicochemical, microbiological, bioactive, antioxidant, and aromatic characteristics of strawberries cv. 'Oso Grande' in refrigerated storage for 12 days. The coatings improved the shelf life and stability of strawberries, minimizing their weight loss (2.6-3.9 %), as well as changes in color and texture (except for those coated with CEO), titratable acidity, pH, soluble solids, anthocyanins, phenolic compounds, ascorbic acid content, and antioxidant activity compared with uncoated control straw-berries. The bio-nanocomposite coatings containing MEO and CEO also exhibited antimicrobial activity, reduced visible fungal deterioration (40-60 %), and reduced microbial load (3.59-4.03 log CFU g(-1) for mesophilic aerobic bacteria and 4.45-5.22 log CFU g(-1) for fungi and yeast) during storage. They also significantly reduced the severity of decay caused by inoculation with Botrytis cinerea or Rhizopus stolonifer. The coatings altered the volatile profile of the fruits during storage, decreasing aldehyde and alcohol concentrations and increasing ester concentrations. Thus, these bio-nanocomposite coatings, especially those containing MEO, can be used as anti-microbial coating materials to preserve the post-harvest quality of fresh strawberries. (AU)

• FAPESP's process: 18/24612-9 - Application of nanoemulsions with essential oils as natural coatings for application in post-harvesting strawberry conservation
• Grantee: Josemar Gonçalves de Oliveira Filho
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 19/18748-8 - Chemical composition of strawberries coated with biofilm-based on pomegranate peel extract, chitosan, and gelatin
• Grantee: Mirella Romanelli Vicente Bertolo
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)