期刊
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
卷 69, 期 11, 页码 2186-2192出版社
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.69.2186
关键词
algicidal compounds; Ulva fasciata; hexadeca-4,7,10,13-tetraenoic acid; octadeca-6,9,12,15-tetraenoic acid; alpha-linolenic acid
Thirty-seven species of seaweeds including 10 Chlorophyta, 13 Phaeophyta, and 14 Rhodophyta collected from the coast of Nagasaki Prefecture, Japan, were screened for algicidal activity against the red-tide phytoplankton Heterosigma akashiwo. The green alga Ulva fasciata (Ulvaceae, Chlorophyta) showed the strongest algicidal activity among the seaweeds tested. Bioassay-guided fractionation of the methanol extract of U. fasciata led to isolation of three algicidal compounds whose structures were determined to be hexadeca4,7,10,13-tetraenoic acid (HDTA), octadeca-6,9,12,15-tetraenoic acid (ODTA), and alpha-linolenic acid on the basis of spectroscopic information. These polyunsaturated fatty acids (PUFAs) showed potent algicidal activity against H. akashiwo (LC50 1.35 mu g/ml, 0.83 mu g/ml, and 1.13 mu g/ml for HDTA, ODTA, and alpha-linolenic acid, respectively), and the result demonstrated the potential of these PUFAs for practical harmful algal bloom control.
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