Chemical constituents of the aquatic plant Schoenoplectus lacustris: Evaluation of phytotoxic effects on the green alga Selenastrum capricornutum

  • D'Abrosca B
  • Dellagreca M
  • Fiorentino A
 et al. 
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Abstract

Forty-nine secondary metabolites were isolated from aqueous and alcoholic extracts of the aquatic plant Shoenoplectus lacustris. All compounds were characterized based on spectroscopic data. Eleven free and glycosylated low-molecular polyphenols, 17 cinnamic acid and dihydrocinnamic acid derivatives, 11 flavonoids, and 10 C-13 nor-isoprenoids were identified. The structure of the new compound, 1-benzoyl-glycerol-2-alpha-L-arabinopyranoside, was elucidated by 2D NMR experiments (COSY, HSQC, HMBC, NOESY). To evaluate potential phytotoxic effects, all compounds were tested on the green alga Selenastrum capricornutum, a unicellular organism commonly used in tests of toxicity as a bioindicator of eutrophic sites. The most active compound was (-)-catechin, showing an inhibition similar to that of the algaecide CuSO4.

Author-supplied keywords

  • (-)-catechin
  • Antialgal
  • C13nor-isoprenoids
  • Cinnamic acids
  • Dihydrocinnamic acids
  • Flavonoids
  • Phytotoxicity
  • Polyphenols
  • Schoenoplectus lacustris
  • Selenastrum capricornutum

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