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Antibacterial properties of the microalgae Chaetoceros calcitrans

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Date
2012
Author
Seraspe, Ebonia B.
Ticar, Bernadeth F.
Formacion, Minda J.
Pahila, Ida G.
de la Peña, Milagros R.
Amar, Edgar C.
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Abstract
The antibacterial properties of the microalgae Chaetoceros calcitrans were assessed. Samples of C. calcitrans were first extracted in methanol, and then in different organic solvents of increasing polarity, n-hexane (n-Hex), dichloromethane (DCM) and ethyl acetate (EA) by liquid-liquid extraction. Solvent extracts were screened for antibacterial activity against four species of bacteria: Gram positive, Staphylococcus aureus and Bacillus subtilis; and Gram negative, Escherichia coli and Vibrio harveyi, with Amoxicillin as positive control, N-Hex extract, with significantly lower antibacterial activity than Amoxicillin, showed significantly higher activity than DCM and EA extracts, and least in methanolic extract. High antibacterial activity of n-Hex extract against all the microorganisms indicates that the bioactive components could be non-polar since the activity decreased as the solvent became more polar like methanol, and finally lost in aqueous extract. Results also showed that the extracts have a broad spectrum activity. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of all solvent extracts on all microorganisms tested ranged from 125 to 500 μg.mL-1. Partial purification and characterisation of the extracts confirmed the antibacterial activity in the non-polar fraction, which could be terpenes. The results suggest a good prospect in using C. calcitrans against Vibrio and other bacterial species.
URI
http://hdl.handle.net/10862/2228
Suggested Citation
Seraspe, E. B., Ticar, B. F., Formacion, M. J., Pahila, I. G., de la Peña, M. R., & Amar, E. C. (2012). Antibacterial properties of the microalgae Chaetoceros calcitrans. Asian Fisheries Science, 25(4), 343-356.
Subject
aquaculture ASFA; microorganisms ASFA; solvents ASFA; liquids ASFA; fisheries development ASFA; species ASFA; Philippines; Antimicrobial properties; Extracts; Feed production; Chaetoceros calcitrans
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