A Comprehensive Investigation on Ho Wood Essential Oil Solution or Gel Using Pickering Systems

Author(s)

Souza, Alana G. ; Ferreira, Rafaela R. ; Marciano, Jessica S. ; Oliveira, Eder R. ; Kato, Mauricio M. ; Yudice, Eliana D. C. ; Setz, Luiz F. ; Rangari, Vijaya K. ; Rosa, Derval S.

• Document type: Journal article
• Source: JOURNAL OF POLYMERS AND THE ENVIRONMENT; v. N/A, p. 17-pg., 2023-01-13.

Abstract

Essential oils have received increasing attention due to their known biological activities and health benefits. The emulsions should be more liquid or viscous (gels) based on the desired application. This work aimed to prepare ho wood (linalool) essential oil solutions or gels using the Pickering emulsion approach, providing a comprehensive overview of the nanocellulose morphology influence on the final property of the linalool material, from its morphology to its chemical interactions with the oil that could influence the formation of the gel or solution. The solutions were prepared using cellulose nanocrystals (CNC), while the gels were prepared with cellulose nanofibers (CNF). The Sol-CNC showed oval droplets of similar to 30 mu m surrounded by nanocrystals anchored onto the oil surface via chemical interactions. The Gel-CNF showed droplets of similar to 40 mu m encapsulated by the nanofibers and forming a three-dimensional network with a shear-thinning flow behavior, analyzed by Ostwald-de-Waele model. Both systems showed good stability over time and towards shear. The Sol-CNC stability is associated with new hydrogen bonds that maintain the structures together and avoid their instability, while the Gel-CNF did not alter the compound's chemical structures, indicating a steric mechanism. While the Sol-CNC samples only inhibited the Staphylococcus aureus bacteria, the Gel-CNF inhibited Escherichia coli, S. aureus, and Salmonella. The stabilization and chemical interactions influenced the oil's active component volatility, altering its antimicrobial action. The Sol or Gel samples are antimicrobial systems with unique properties that can be applied in a broad spectrum of products, such as hygienic, food, and disinfection. (AU)

• FAPESP's process: 22/01382-3 - Cellulose hydrogels containing modified clays for the removal and recovery of metal ions present in contaminated water
• Grantee: Rafaela Reis Ferreira
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 15/16859-6 - Rheological evaluation of ceramic biomaterials.
• Grantee: Luiz Fernando Grespan Setz
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/13703-3 - Environmentally friendly porous materials for the recovery and revaluation of metals reclaimed from contaminated water
• Grantee: Derval dos Santos Rosa
• Support Opportunities: Research Projects - Thematic Grants