Antioxidant and Antimicrobial Potencies of Chemically-Profiled Essential Oil from against Clinically-Important Pathogenic Microbial Strains.

Recently, the antimicrobial potential of essential oils extracted from plants has gained extensive research interest, primarily for the development of novel antimicrobial treatments to combat emerging microbial resistance. The current study aims at investigating the antimicrobial activity and chemical composition of essential oil derived from gold coin daisy, which is known as (EOAG). In this context, a gas chromatography-tandem mass spectrometry (GC-MS) analysis of EOAG was conducted to identify its phytoconstituents. The in vitro antioxidant capacity of EOAG was determined by the use of three tests, namely: 1,1-diphenyl-2-picrylhydrzyl (DPPH), ferric reducing activity power (FRAP), and total antioxidant capacity (TAC). The antimicrobial activity of EOAG against clinically important bacterial (, K12; , ATCC 6633; , DSM 6333; and , CIP A22) and fungal (, ATCC 10231; , MTCC 282; , MTCC 9606; and MTCC 9913) strains was assessed. Antimicrobial efficacy was determined on solid (inhibition diameter) and liquid media to calculate the minimum inhibitory concentration (MIC). GC/MS profiling of EOAG revealed that 18 compounds were identified, with a dominance of α-Thujone (17.92%) followed by carvacrol (14.14%), with a total identification of about 99. 92%. The antioxidant activity of EOAG was determined to have IC values of 34.81 ± 1.12 µg/mL (DPPH), 89.37 ± 5.02 µg/mL (FRAP), and 1048.38 ± 10.23 µg EAA/mg (TAC). The antibacterial activity in a solid medium revealed that the largest diameter was recorded in (28.47 ± 1.44 mm) followed by (27.41 ± 1.54 mm), and the MIC in was 12.18 ± 0.98 µg / mL. For the antifungal activity of EOAG, the largest inhibition diameter was found in (33.62 ± 2.14 mm) followed by (26.41 ± 1.90 mm), and the smallest MIC was found in (18.29 ± 1.21 µg/mL) followed by (19.39 ± 1.0 µg/mL). In conclusion, EOAG can be useful as a natural antimicrobial and antioxidant agent and an alternative to synthetic antibiotics. Hence, they might be utilized to treat a variety of infectious disorders caused by pathogenic microorganisms, particularly those that have gained resistance to standard antibiotics.