Comparative study on chemical profiling and antimicrobial properties of essential oils from different parts of Eucalyptus lanceolatus

In this study, essential oils from stem, leaf and bud of Eucalyptus lanceolatus were analysed and chemical profiling was done by Gas Chromatography-Mass Spectrometry (GC-MS). The major components of the oils found to have eucalyptol, alpha pinene, beta pinene, alpha eudesmol and para cymene. Eucalyptol is present in large quantity in bud oil (24.96%) followed by alpha and beta pinene (21.71% and 14.20%, respectively). In stem oil, alpha pinene (32.25%) and beta pinene (19.20%) are present in good quantity. In leaf oil, along with alpha and beta pinene, alpha eudesmol is present in good amount. These essential oils also exhibited potent antifungal and antibacterial activities. Further, antimicrobial and antioxidant constituents of the oils were spotted by bio-autography technique. In addition to this, in vitro DPPH radical scavenging activity and metal ion chelation potential of these oils were also investigated and found out that the bud oil has remarkable scavenging potential with IC50 value of 175μl/ml, followed by leaf and stem oil.