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Published in: BMC Complementary Medicine and Therapies 1/2018

Open Access 01-12-2018 | Research article

Rhaponticum acaule (L) DC essential oil: chemical composition, in vitro antioxidant and enzyme inhibition properties

Authors: Habib Mosbah, Hassiba Chahdoura, Jannet Kammoun, Malek Besbes Hlila, Hanen Louati, Saoussen Hammami, Guido Flamini, Lotfi Achour, Boulbaba Selmi

Published in: BMC Complementary Medicine and Therapies | Issue 1/2018

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Abstract

Background

α-glucosidase is a therapeutic target for diabetes mellitus (DM) and α-glucosidase inhibitors play a vital role in the treatments for the disease. Furthermore, xanthine oxidase (XO) is a key enzyme that catalyzes hypoxanthine and xanthine to uric acid which at high levels can lead to hyperuricemia which is an important cause of gout. Pancreatic lipase (PL) secreted into the duodenum plays a key role in the digestion and absorption of fats. For its importance in lipid digestion, PL represents an attractive target for obesity prevention.

Methods

The flowers essential oil of Rhaponticum acaule (L) DC (R. acaule) was characterized using gas chromatography-mass spectrometry (GC-MS). The antioxidant activities of R. acaule essential oil (RaEO) were also determined using 2,2’-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS), reducing power, phosphomolybdenum, and DNA nicking assays. The inhibitory power of RaEO against α-glucosidase, xanthine oxidase and pancreatic lipase was evaluated. Enzyme kinetic studies using Michaelis-Menten and the derived Lineweaver-Burk (LB) plots were performed to understand the possible mechanism of inhibition exercised by the components of this essential oil.

Results

The result revealed the presence of 26 compounds (97.4%). The main constituents include germacrene D (49.2%), methyl eugenol (8.3%), (E)-β-ionone (6.2%), β-caryophyllene (5.7%), (E,E)-α-farnesene (4.2%), bicyclogermacrene (4.1%) and (Z)-α-bisabolene (3.7%). The kinetic inhibition study showed that the essential oil demonstrated a strong α-glucosidase inhibiton and it was a mixed inhibitor. On the other hand, our results evidenced that this oil exhibited important xanthine oxidase inhibitory effect, behaving as a non-competitive inhibitor. The essential oil inhibited the turkey pancreatic lipase, with maximum inhibition of 80% achieved at 2 mg/mL. Furthermore, the inhibition of turkey pancreatic lipase by RaEO was an irreversible one.

Conclusion

The results revealed that the RaEO is a new promising potential source of antioxidant compounds, endowed with good practical applications for human health.
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Metadata
Title
Rhaponticum acaule (L) DC essential oil: chemical composition, in vitro antioxidant and enzyme inhibition properties
Authors
Habib Mosbah
Hassiba Chahdoura
Jannet Kammoun
Malek Besbes Hlila
Hanen Louati
Saoussen Hammami
Guido Flamini
Lotfi Achour
Boulbaba Selmi
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Complementary Medicine and Therapies / Issue 1/2018
Electronic ISSN: 2662-7671
DOI
https://doi.org/10.1186/s12906-018-2145-5

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