Chemical constituents of the aquatic plant Schoenoplectus lacustris: evaluation of phytotoxic effects on the green alga Selenastrum capricornutum.
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 C13 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.
D'Abrosca
Brigida
B
Dipartimento di Scienze della Vita, Seconda Università di Napoli, via Vivaldi 43, 81100 Caserta, Italy.
Dellagreca
Marina
M
Fiorentino
Antonio
A
Isidori
Marina
M
Monaco
Pietro
P
Pacifico
Severina
S
D000460:Chlorophyta / Q000187:drug effects*; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000633:toxicity*; D010944:Plants / Q000737:chemistry*
D010936:Plant Extracts