Antibacterial activity of some plant extracts against fish foodborne spoilage bacteria and their effects on the quality of mullet fish [electronic resource].

Includes references.

The objective of this study was to look into the effect of plant extracts on the microbial contamination of mullet fish. Antimicrobial activities of three plant extracts (olive leaves, garlic heads, and aloe vera gel) against spoilage organisms of samples collected from Bardawil lagoon were assessed by measuring inhibition zones, using the plate diffusion method and aloe vera gel gave the best inhibition effect The aqueous extracts (1%) of plants were used to make ice to study their antimicrobial effect against natural microbial fish isolates. The results indicated that the microbial contamination has increased during storage time in all treatments, however the preservation of fish in ice made with plants' extracts, especially aloe vera gel, decreased the numbers of TBC, Psychrophilic and Vibrio counts significantly (P <0.05) compared to the control. The sensory evaluation test indicated that the best results have achieved with fish samples preserved in ice made with aloe vera gel. The results of this study constitute an indicator of possible bacteriological contamination of mullet fish. This study confirms the effectiveness of some plant extracts as natural antimicrobials and recommends the possibility of employing them in fish preservation where spoilage is caused mainly by microbial activity.

Summary in Arabic.

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