Gamal M. Hamad^{1, 2,}, Amira M.G. Darwish^{1, 2}, Marwa M Abu-Serie^{3, 2}, Sobhy A. El Sohaimy^{1, 2}

Objectives: Cassia fistula and Ocimum basilicum which are assumed to contain the active components and which are renewable source in fighting infections of microorganisms. The aim of this study was to investigate the antimicrobial activity, the antioxidant activity and anti-inflammatory properties of Cassia fistula and Ocimum basilicum and their mix. Methods and Materials: Cassia fistula and Ocimum basilicum exhibited antimicrobial activity against all of the tested bacteria and yeasts except for Asperigillus spp. that showed high resistance. Results and Discussion: The minimum inhibitory concentration (MIC) values for bacteria and yeast ranged from 3.1 to 6.2 mg/ mL. The antioxidant activity of the Cassia fistula and Ocimum basilicum was evaluated by using DPPH radical scavenging assay. In addition, the amount of total phenolic content (TPC) of Cassia fistula, Ocimum basilicum and their mix was 64.71, 96.42 and 113.07 mg/g, while total flavonoids content was 16.33, 32.66 and 79 mg/g respectively. Vanillin, quercetin and cinnamic acid marked the phenolic profile of the mix. Cytotoxicity results indicated high safety use of the two plants. Conclusion: Our data confirmed convenient and safe use of C. fistula, O. basilicum and their mix as natural antimicrobial and antioxidant. The mix of both extracts can be recommended as natural preservative to be used in food processing to control and prevent food contamination.

Cassia fistula and Ocimumbasilicum, Antimicrobial activity, antioxidant, anti-inflammatory, cytotoxicity assay, foodborne pathogens