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EC number: 946-670-6
CAS number: -
In a study investigating the aerobic biodegradation of several
sesquiterpenes (Jenner K.J., Kreutzer G. and Racine P., Environmental
Toxicology and Chemistry, Vol. 30, No. 5, pp, 2011), an OECD test
guidance 301F Manometric Respiratory was conducted on several chemical
structures, including Thujopsene. After 28 days, the biodegradation of
this substance was found 36%, and after 60 days 56%. However, the
degradation curve did not reach a plateau even after day 65, indicating
that the substance is very probably ultimately biodegradable. This is
argued by a specific analysis in this study, which had indicated the
complete biodegradation of the parent compound, which means that there
is a full primary degradation. Given poor bioavailability (poorly
soluble substance) and that this ready biodegradability test is very
stringent, it can be expected that Thujopsene or other constituents of
the UVCB with similar chemical structures would be more easily
biodegraded in environmental conditions.
Overall, Thujopsene is inherently biodegradable in test conditions, but
is probably readily biodegradable under environmental conditions,
especially when it is part of an UVCB.
The conclusion "inherently biodegradable, fulfilling specific criteria"
will be used to conduct the environmental CSA.
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