Abstract
A study to identify the acidic components ofCladophora glomeata active againstAedes triseriatus larvae was extended to a mixture obtained by extracting the dried powdered alga in aqueous suspension at pH 8.5. The presence of 1,9-nonanedioic, 1,10-decanedioic, 1,11-undecanedioic and 4-ketononanoic acids was determined by GC-EIMS and GC-CIMS and confirmed by analytical coinjection GC. The presence of 5-pentyldihydro-2(3H)-furanone, a minor component, was also indicated. The group of major acidic constituents is different from those obtained by extracting driedCladophora with methanol. In contrast to the C10–C14 monocarboxylic acids, which hadLD 50 values<20 ppm againstA. triseriatus, none of the dicarboxylic acids of the series G4–C14, C16, and C22 were active; nor were 4-ketononanoic acid and 5-pentyldihydro-2(3H)-furanone active.
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Lalonde, R.T., Slayback, J.R.B., Hofstead, S.J. et al. GC-MS detected difunctional carboxylic acids released by driedCladophora at the pH of lake ontario and the st. lawrence river. J Chem Ecol 6, 27–33 (1980). https://doi.org/10.1007/BF00987524
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DOI: https://doi.org/10.1007/BF00987524