Rieny Sulistijowati, Zulfandi Karim, Junianto
This study aimed at investigating the antibacterial activity of flavonoids extracted from the fruit of Sonneratia alba towards Vibrio alginolyticus. Positive control (chloramphenicol) and negative control (distilled water) were applied as comparator parameters. This research applied complete randomized design through 2 repetitions. Treatments for the determination of the minimum inhibitory concentration of flavonoid extracts had concentrations of 62.5, 125, 250 and 500 ppm. Treatments concentration for the determination of the flavonoid inhibition zone diameter had 250, 375, and 500 ppm. Data were analyzed using the Anova and the Duncan test. Findings revealed that the minimum inhibitory concentration value is at 250 ppm, as shown by the clean appearance of the V. alginolyticus inoculums suspension. The Duncan test revealed that 250, 375, and 500 ppm concentrations are able to develop significantly different inhibition activities towards V. alginolyticus. The inhibition zone for each concentration are 8.07, 9.23, and 10.33 mm, respectively. It was found that a concentration level of 500 ppm has an antibacterial potential against V. alginolyticus, which is one of the pathogens causing the ice-ice disease on Kappaphycus alvarezii. © 2020, BIOFLUX SRL. All rights reserved.
Gorontalo State University, Faculty of Fishery and Marine Science, Departement Technology Fisheries Process, Central City of Gorontalo, 96128, Indonesia; Padjadjaran University, Faculty of Fishery and Marine Science, Departement Fisheries, Sumedang, 45363, Indonesia
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