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Abstract
Mentha longifolia (Lamiaceae) is regarded as highly valuable aromatic medicinal species with wide range of pharmaceutical application. In the present work, leaf essential oil of M. longifolia was applied for the assessment of in vitro pharmacological potentials and compositional analysis. A sum of 15 compounds were detected by GC-FID and GC-MS analysis of M. longifolia essential oil with total area of 99.98% where major compounds were carvone (59.56%), D-limonene (20.81%), eucalyptol (10.08%). The anti-oxidant potency of M. longifolia was estimated using two methods viz., ABTS (2,2-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid) and DPPH (2,2-diphenyl-1-picrylhydrazyl) assay where M. longifolia essential oil showed moderate anti-oxidant potency. M. longifolia essential oil revealed high anti-inflammatory and tyrosinase inhibitory activity with an IC50 value 3.68 μL/mL and 1.22 μL/mL respectively compared to standard sodium diclofenac (5.33 μL/mL) and kojic acid (2.28 μL/mL). The acetylcholinesterase (AchE) inhibitory and genotoxic assay was performed, where M. longifolia essential oil revealed strong anti-acetylcholinesterase and anti-genotoxic activity. Anti-microbial potential of M. longifolia essential oil was also where strong anti-bacterial activity was shown against Salmonella typhimurium, Bacillus cereus, Staphylococcus aureus, Micrococcus luteus. For anti-fungal activity, M. longifolia essential oil showed no zone of inhibition against any used strains except Aspergillus flavus. From the present research it was established that M. longifolia essential oil possesses pharmaceutical potential with strong AchE inhibitory, anti-inflammatory, anti-microbial, anti-tyrosinase, anti-genotoxic and anti-oxidant activity which can be used for plant-based drug development in future endeavor.