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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

In a study conducted according to guidelines (EU Method C.3; OECD Guideline 201) the 72 h NOEC and EC50 based on growth rate and yield of Desmodesmus subspicatus were determined to be 100 and >100 mg/L L-tryptophan nominal (corresponding to a geometric mean measured concentration of 84.8 and >84.8 mg/L), respectively.

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
100 mg/L

Additional information

The toxicity of L-tryptophan to Desmodesmus subspicatus was investigated in a study conducted according to EU Method C.3 (Algal Inhibition test; 2008) and OECD Guideline 201 (Alga, Growth Inhibition Test; 2006). Cultures of Desmodesmus subspicatus were exposed to a nominal concentration of 100 mg/L (limit test) in a static test for 72 h. The 72 h NOEC and EC50 based on growth rate and yield were determined to be 100 and >100 mg/L nominal (corresponding to a geometric mean measured concentration of 84.8 and >84.8 mg/L), respectively.