588 0009-3130/18/5403-0588
2018 Springer Science+Business Media, LLC
Chemistry of Natural Compounds, Vol. 54, No. 3, May, 2018
CHEMICAL COMPOSITION AND ANTIOXIDANT ACTIVITY
OF THE ESSENTIAL OIL OF Plectranthus ‘Mona Lavender’
Peng-Xiang Lai,* Cheng-lei Wang, and Lu Ma
Plectranthus ‘Mona Lavender’ is a popular garden plant but was only recently bred by Roger Jacques from two
species of Plectranthus in Cape Town, South Africa. It is a vigorous, upright, rounded, bushy perennial that typically grows to
75 cm tall. Plectranthus ‘Mona Lavender’ is used for its repellent effect on mosquitoes.
The essential oil composition of Plectranthus ‘Mona Lavender’ has not been previously investigated. Herein we
report for the first time the chemical composition of the essential oil from the fresh aerial parts of Plectranthus ‘Mona Lavender’
and evaluate its antioxidant activity by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay.
The results from a chemical analysis of the essential oil of Plectranthus ‘Mona Lavender’ are shown in Table 1.
Sixty-one compounds, which represent 97.08% of the essential oil, were identified. The main constituents of the oil of
Plectranthus ‘Mona Lavender’ were humulene (14.26%), humulene 1,2-epoxide (9.26%), chloropyrifos (7.45%),
D
-cadinol
(7.10%), and sclareol (4.85%). Humulene has been found to produce anti-inflammatory effects in mammals, and has potential
to be a tool in the management of inflammatory diseases. It produces similar effects to dexamethasone and was found to
decrease edema caused by histamine injections [1].
D
-Cadinol was said to act as an antifungal [2] and as a hepatoprotective
agent [3] and was proposed as a possible remedy for drug-resistant tuberculosis [4]. Sclareol is also able to kill human leukemia
cells and colon cancer cells by apoptosis [5, 6].
College of Marine Science, Shandong University, 264209, Weihai, P. R. China, fax: +86 631 5688303,
e-mail: wh_xiang6@163.com. Published in Khimiya Prirodnykh Soedinenii, No. 3, May–June, 2018, pp. 499–500.
Original article submitted August 11, 2016.
TABLE 1. Composition of the Essential Oil of Plectranthus ‘Mona Lavender’
Compound
a
RI
b
RT Peak area, %
E
-Linalool
1105 5.74 0.13
1-Mesityl-1,3-butadiene 1374 8.36 0.17
D
-Cubebene
1387 8.47 0.06
Damascenone 1393 8.53 1.09
1-(4-Hydroxy-3,8-dimethyl-1,3a,4,5,6,7-hexahydro-5-azulenyl)ethanone 1398 8.57 0.31
E
-Bourbonene
1403 8.62 0.60
2-tert-Butyl-1,4-dimethoxybenzene 1419 8.76 0.90
3-Cyclopentyl-6-methyl-3,4-heptadien-2-one 1423 8.79 0.12
D
-Gurjunene
1428 8.84 0.29
E
-Caryophyllene
1443 8.96 2.07
Cedrene 1452 9.04 0.28
D
-Patchoulene
1460 9.10 0.26
Nerone 1468 9.17 0.20
Humulene 1479 9.27 14.26
5-sec-Butylpyrogallol 1488 9.34 0.37
D
-Amorphene
1493 9.39 0.70
Germacrene B 1497 9.42 0.28
Germacrene D 1504 9.48 0.25
Farnesene 1509 9.52 1.00
D
-Muurolene
1517 9.58 1.08
DOI 10.1007/s10600-018-2417-9
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