Application of the polycaprolactone polymer for the encapsulation of geraniol: evaluation of the efficiency and stability

Thaís Karoline Carniel; Pâmela Fagundes; Ana Carolina Vivan; Luciano Luiz Silva; Micheli Zanetti; Francieli Dalcanton; Josiane Maria Muneron de Mello; Márcio Antônio Fiori

doi:10.1515/polyeng-2021-0026

Article

Application of the polycaprolactone polymer for the encapsulation of geraniol: evaluation of the efficiency and stability

Thaís Karoline Carniel , Pâmela Fagundes , Ana Carolina Vivan , Luciano Luiz Silva , Micheli Zanetti , Francieli Dalcanton , Josiane Maria Muneron de Mello and Márcio Antônio Fiori

Published/Copyright: May 7, 2021

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From the journal Journal of Polymer Engineering Volume 41 Issue 6

Abstract

Geraniol has been an attractive compound for food preservation due to its antibacterial and antifungal actions. The main objective of this study was to produce and characterize polycaprolactone (PCL) capsules for the protection of the encapsulated geraniol essential oil. The encapsulation was carried out using a miniemulsion polymerization technique with an efficiency of (95.44 ± 0.60%). The capsules were obtained with a mean size of 148 nm and with a polydispersity index of 0.12. Transmission electron microscopy results confirmed the formation of spherical capsules of PCL coating the geraniol. From the analysis of thermogravimetry, it was possible to prove the thermal protection of geraniol by PCL coating since the release of the encapsulated geraniol occurred with temperatures 100 °C higher than the volatilization temperature of the natural compound. An important observation was that the microcapsules of PCL-geraniol immersed in aqueous suspensions at 4 °C showed good stability over 60 days.

Keywords: encapsulated geraniol; PCL capsules; PCL-geraniol microcapsules

Corresponding author: Márcio Antônio Fiori, Post-Graduate Program in Technology and Innovation Management, Community University of the Chapecó Regions (Unochapecó), Chapecó, 89809-000 SC, Brazil; and Post-Graduate Program in Environmental Sciences, Community University of the Chapecó Regions (Unochapecó), Chapecó 89809-000, SC, Brazil, E-mail: fiori@unochapeco.edu.br

Acknowledgments

The authors are grateful for the support and infrastructure provided by the Community University of the Region of Chapecó – Unochapecó, UNIEDU Post-Graduate Program, the National Council for Scientific and Technological Development – CNPq and of the Structural Characterization Laboratory (LCE) of the Materials Engineering Department (DEMa) of the Federal University of São Carlos (UFSCar).

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-02-05

Accepted: 2021-04-13

Published Online: 2021-05-07

Published in Print: 2021-07-27

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Articles in the same Issue

https://doi.org/10.1515/polyeng-2021-0026

Keywords for this article

encapsulated geraniol; PCL capsules; PCL-geraniol microcapsules