Abstract
The use of antioxidants and antibacterial compounds obtained from natural sources is important for human and animal health, as well as for controlling diseases. The aim of this study was to evaluates the antioxidant potentials and antibacterial effects of water extracts of C. sativa, U. dioica, A. deliciosa and C. aurantium against selected Gram-negative (Vibrio harveyi, Vibrio vulnificus, Vibrio anguillarum, Vibrio rotiferianus, Vibrio campbellii, Vibrio ponticus and Aeromonas veronii) and Gram-positive (Bacillus thuringiensis) bacteria. The results indicated that all extracts showed antibacterial activity against one or more species of bacteria. The chestnut shell extract had the highest DPPH inhibition (87.03 %) followed by citrus fruit (80.40 %). The most susceptible bacteria were V. harveyi (32.05 mm zone diameter) and, V. campbellii (21.66 mm zone diameter) and the resistant species were V. anguillarum, V. ponticus and A. veronii. The results show that plant extracts have the potential to be used as an antibacterial agent in aquaculture and as an antioxidant agent in processing technology.
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