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Molecules 2011, 16(2), 1181-1191; doi:10.3390/molecules16021181
Article

Seasonal Variation in the Chemical Composition and Antimicrobial Activity of Volatile Oils of Three Species of Leptospermum (Myrtaceae) Grown in Brazil

1
,
1,* , 1
,
1
,
1
 and
2
1 Departamento de Química, Universidade Federal de Vicosa, Av. P. H. Rolfs, s/n, 36570-000, Vicosa, MG, Brazil 2 Departamento de Engenharia Florestal, Universidade Federal de Vicosa, Av. P. H. Rolfs, s/n, 36570-000, Vicosa, MG, Brazil
* Author to whom correspondence should be addressed.
Received: 27 December 2010 / Revised: 11 January 2011 / Accepted: 18 January 2011 / Published: 26 January 2011
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Abstract

This study investigates the seasonal variation of three species of Leptospermum (Myrtaceae) grown in Brazil. The chemical composition of the volatile oils of L. flavescens and L. petersonii did not show any significant seasonal variation in the major components, while for Leptospermum madidum subsp. sativum the levels of major constituents of the volatile oils varied with the harvest season. Major fluctuations in the composition of L. madidum subsp. sativum oil included α-pinene (0–15.2%), β-pinene (0.3–18.5%), α-humulene (0.8–30%), 1,8-cineole (0.4–7.1%) and E-caryophyllene (0.4–11.9%). Levels of β-pinene (0.3–5.6%), terpinen-4-ol (4.7–7.2%) and nerolidol (55.1–67.6%) fluctuated seasonally in the L. flavescens oil. In L. petersonii, changes were noted for geranial (29.8–32.8%), citronellal (26.5–33.9%) and neral (22.7–23.5%). The activity of the volatile oils against the tested bacteria differed, depending on season the oils were obtained. In general, the volatile oils were more active against Gram-positive bacteria.
Keywords: Myrtaceae; Leptospermum; seasonal variation; essential oils; antibacterial activity Myrtaceae; Leptospermum; seasonal variation; essential oils; antibacterial activity
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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Demuner, A.J.; Almeida Barbosa, L.C.; Gonçalves Magalhaes, C.; Da Silva, C.J.; Alvares Maltha, C.R.; Lelis Pinheiro, A. Seasonal Variation in the Chemical Composition and Antimicrobial Activity of Volatile Oils of Three Species of Leptospermum (Myrtaceae) Grown in Brazil. Molecules 2011, 16, 1181-1191.

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