Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Enhancing the Extraction Process Efficiency of Thyme Essential Oil by Combined Ultrasound and Microwave Techniques

Adina Ionuta Gavrila
ORCID logo ,
Ciprian Gabriel Chisega-Negrila
,
Laura Maholea
,
Mircea Leontin Gavrila
,
Oana Cristina Pârvulescu
,
Ioana Popa
* ORCID logo
Version 1 : Received: 19 August 2023 / Approved: 22 August 2023 / Online: 22 August 2023 (09:37:49 CEST)

A peer-reviewed article of this Preprint also exists.

Gavrila, A.I.; Chisega-Negrila, C.G.; Maholea, L.; Gavrila, M.L.; Parvulescu, O.C.; Popa, I. Enhancing the Extraction Process Efficiency of Thyme Essential Oil by Combined Ultrasound and Microwave Techniques. Agronomy 2023, 13, 2331. Gavrila, A.I.; Chisega-Negrila, C.G.; Maholea, L.; Gavrila, M.L.; Parvulescu, O.C.; Popa, I. Enhancing the Extraction Process Efficiency of Thyme Essential Oil by Combined Ultrasound and Microwave Techniques. Agronomy 2023, 13, 2331.

Abstract

In this paper, the extraction of essential oil (EO) from thyme by consecutive use of ultrasound and microwave treatments is presented. The aim of the study was to apply an ultrasound pre-treatment of thyme leaves to enhance the thymol content and the extraction yield of the EO obtained by microwave-assisted hydro-distillation (MWHD). Compared with the conventional hydro-distillation (CHD), the consecutive use of ultrasound and microwave treatments resulted in a 72% lower extraction time. When the ultrasound pre-treatment (using the ultrasonic processor with an amplitude of 70%) was applied, the EO content was 23% higher compared to the extraction without pre-treatment. The EO samples were analyzed by GC/MS. The results showed that the major component, thymol, varied from 43.54% (by CHD) to 65.94% (by consecutive use of ultrasound and microwave treatments).

Keywords

ultrasound pre-treatment; microwave hydro-distillation; thyme; essential oil; thymol

Subject

Chemistry and Materials Science, Chemical Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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