Chemical composition, antioxidant activity and inhibitory effects of essential oil of Eucalyptus teretecornis grown in north-western Himalaya against Alternaria alternata (original) (raw)

Abstract

The essential oil obtained from fresh leaves of Eucalyptus teretecornis (family Myrtaceae) was analysed by gas chromatography/mass spectrometry (GC/MS). Twenty eight compounds were identified and β-pinene (22.55%), α-pinene (22.50%), 1,8-cineole (19.84%), limonene (5.62%), β-fenchol (3.10%), α-phellandrene (2.90%), α-eudesmol (2.66%) and 4-(2-methylcyclohex-1-enyl)-but-2-enal (2.34%) were the main components. The antifungal activity of the essential oil was assayed against Alternaria alternata using bioautography. Two main bioactive components namely a1 (R f = 0.27) and a2 (R f = 0.33) were observed that produced inhibition zone of 4 mm and 8 mm in diameter respectively. The minimum inhibitory amount (MIA) of a1 and a2 against A. alternata was determined as 28 μg and 10 μg, respectively using bioautography assay. Components corresponding to a1 and a2 were determined as β-fenchol (oxygenated monoterpene) and α-eudesmol (oxygenated sesquiterpene) respectively using GC/MS analysis. The antioxidant activity of the essential oil and its bioactive fraction was evaluated by DPPH radical scavenging assay, β-carotene/linoleic acid bleaching assay, reducing power assay and metal chelating assay. In addition fraction of the essential oil that showed antioxidant activity was analyzed using GC/MS and α-fenchol, 4-terpineol and carvacrol were the main components.

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Abbreviations

BHT:

Butylated hydroxyl toluene

BHA:

Butylated hydroxyl anisole

GC/MS:

Gas chromatography/mass spectrometry

TLC:

Thin layer chromatography

PTLC:

Preparative thin layer chromatography

MIA:

Minimum inhibitory amount

DPPH:

1,1-diphenyl-2-picrylhydrazyl

ISM:

Indian system of medicine

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Acknowledgement

The authors thank Mr. S.K. Sharma, Botanist, Herbal Garden and Herbarium Research Institute in ISM, Joginder Nagar, District Mandi, H.P., India for the identification of plant material.

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Authors and Affiliations

  1. Natural Product Laboratory, Division of Biochemistry and Plant Physiology, SK University of Agricultural Sciences and Technology, Chatha, 180 009, Jammu, India
    Sanjay Guleria, A. K. Tiku, Sahil Gupta, Gurjinder Singh & Apurva Koul
  2. Division of Plant Pathology, SK University of Agricultural Sciences and Technology, Chatha, 180 009, Jammu, India
    V. K. Razdan

Authors

  1. Sanjay Guleria
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  2. A. K. Tiku
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  3. Sahil Gupta
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  4. Gurjinder Singh
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  5. Apurva Koul
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  6. V. K. Razdan
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Corresponding author

Correspondence toSanjay Guleria.

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Guleria, S., Tiku, A.K., Gupta, S. et al. Chemical composition, antioxidant activity and inhibitory effects of essential oil of Eucalyptus teretecornis grown in north-western Himalaya against Alternaria alternata .J. Plant Biochem. Biotechnol. 21, 44–50 (2012). https://doi.org/10.1007/s13562-011-0073-2

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