Abstract
We determined the structure of two compounds, namely, 5,8,11,14,17-eicosapentaenoic acid (EPA) and di-n-octylphthalate (DnOP), which have algicidal activity against the toxic dinoflagellate, Cochlodinium polykrikoides. The polyunsaturated fatty acid EPA and the anthropogenic DnOP were isolated from the MeOH extract of the red alga Corallina pilulifera. We also found that a commercial EPA has algicidal activity identical to that of the EPA purified from C. pilulifera. At low inoculum (5.0 × 102 cells mL−1), the highest algicidal activity of a commercial EPA exhibited approximately 92.6% algicidal activity after 1 h and 96.8% after 6 h treatment at 6 µg mL−1, respectively. At high inoculum (1.0 × 104 cells mL−1), the strongest algicidal activity of EPA showed 69.5% after 1 h and 75.5% algicidal activity after 6 h treatment at 6 µg mL−1, respectively. However, EPA did not show algicidal activity against several microalgae used in aquaculture such as Pavlova lutheri, Tetraselmis suecica, Isochrysis galbana, and Nannochloris oculata for 6 h treatment at 6 µg mL−1. The algicidal activity of the five red tide strains to EPA (3 µg mL−1) showed about 86.6%, 86.6%, and 67.3% algicidal activity against Skeletonema costatum, Chaetoceros curvisetus, and C. polykrikoides after 1 h treatment at low inoculum (5.0 × 102 cells mL−1), respectively, but not against Prorocentrum minimum and Scrippsiella trochoidea. We concluded that EPA might be useful as a controlling agent of harmful algal blooms.
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Acknowledgement
The authors thank Mi-jin Cho, Taimo Lee, and Hyun-hye Park for their contributions to this work. This work was supported by a grant from the Regional Technology Innovation Program (RTI05-01-02).
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Oh, MY., Lee, S.B., Jin, DH. et al. Isolation of algicidal compounds from the red alga Corallina pilulifera against red tide microalgae. J Appl Phycol 22, 453–458 (2010). https://doi.org/10.1007/s10811-009-9478-x
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DOI: https://doi.org/10.1007/s10811-009-9478-x