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Background Essential oils are chemical products produced by odoriferous glands from a variety of plants. These essential oil have many health benefits i.e. antiseptic, anti-inflammatory and antimicrobial activities. So due to these medicinal properties present study was designed to analyze essential oil of  Thymus vulgaris  and  Mentha arvensis  for their chemical composition and biological activities. Materials and methods Essential oil from these plants were extracted by hydrodistillation method, and analyzed by GC-MS. To test the microbial activity of these oil disk diffusion method and micro wells method were used. For free radical scavenging DPPH assay was used. However total phenolic content was measured by colorimetric method. Results The GC-MS analysis of  T. vulgaris  oil showed the presence of 47 chemical compounds among which thymol, terpinene, p-cymene and carvacrol were major. However essential oil of  M. arvensis  showed the presence of 28 constituents, among which the Menthone, Menthol, Isomenthone, Eucalyptol, neo-Menthol, cis-Piperitone oxide, Linalool, Thymol, Limonene, and α-Phellandrene were major. Essential oil from both these plant tested for antimicrobial activity showed that the  T. vulgaris  oil was effective against seven bacterial strains and the essential oil of  M. arvensis  was effective against six bacterial strain. The antioxidant activity of both samples by DPPH assay which showed positive result. Conclusion As both species showed the presence of active components, positive microbial activities, and antioxidant activity so, research should be carried on for further biological activities of these oil for betterment of living beings.

GC-MS analysis and biological activities of Thymus vulgaris and Mentha arvensis essential oil