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Essential Oil Extracted from Cymbopogon citronella Leaves by Supercritical Carbon Dioxide: Antioxidant and Antimicrobial Activities

Authors :
Hong Wu
Jilie Li
Yuan Jia
Zhihong Xiao
Peiwang Li
Yixian Xie
Aihua Zhang
Rukuan Liu
Zewen Ren
Mengrui Zhao
Chaozhen Zeng
Changzhu Li
Source :
Journal of Analytical Methods in Chemistry, Vol 2019 (2019)
Publication Year :
2019
Publisher :
Wiley, 2019.

Abstract

To improve essential oil quality, especially to reserve the thermal instability of compounds, supercritical CO2 extraction (SFE) was applied to recover essential oil from Cymbopogon citronella leaves. A response surface methodology was applied to optimize the extraction process. The highest essential oil yield was predicted at extraction time 120 min, extraction pressure 25 MPa, extraction temperature 35°C, and CO2 flow 18 L/h for the SFE processing. Under these experimental conditions, the mean essential oil yield is 4.40%. In addition, the chemical compositions of SFE were compared with those obtained by hydrodistillation extraction (HD). There were 41 compounds obtained of SFE, while 35 compounds of HD. Alcohols and aldehydes were the main compositions in the essential oils. Furthermore, the antioxidant activities and antimicrobial of essential oils obtained by HD and the evaluated condition of SFE were compared. Results showed that the antioxidant activities of SFE oil are better than those of HD. Minimum inhibitory concentrations (MICs) were determined by the microdilution method. Essential oil obtained from SFE and HD exhibited a significant antimicrobial activity against all tested microorganisms. It is confirmed that the SFE method can be an alternative processing method to extract essential oils from Cymbopogon citronella leaves.

Subjects

Subjects :
Analytical chemistry
QD71-142

Details

Language :
English
ISSN :
20908865 and 20908873
Volume :
2019
Database :
Directory of Open Access Journals
Journal :
Journal of Analytical Methods in Chemistry
Publication Type :
Academic Journal
Accession number :
edsdoj.0f628ee696774122a31d087d14bd79cc
Document Type :
article
Full Text :
https://doi.org/10.1155/2019/8192439