3(or 4)-(4-methylpenten-3-yl)cyclohex-3-ene-1-methyl acetate

Biodegradation in water: screening tests

Description of key information

Biodegradability of Myraldyl Acetate has been investigated with a ready biodegradation study according to OECD guideline 301F. In the conditions of the study the substance is considered readily biodegradable. 

Key value for chemical safety assessment

Biodegradation in water:

readily biodegradable

Additional information

Biodegradability of Myraldyl Acetate has been investigated with a ready biodegradation study, OECD 301F. The biodegradation undergoes 67% at day 28, but the 10 -day window was not met; biodegradation at the end of the 10 -day window (days 6 -16) reached 53%. However, the substance is a mixture of isomers. The overall degradation curve will therefore be a multi-phase kinetics. The 10 -day time window criterion was developed on the assumption that a test substance is degraded according to a “standard” growth curve in ready biodegradability tests. The OECD Guidelines for Testing of Chemicals, Section 3. Part 1: Principles and strategies related to the testing of degradation of organic chemicals (adopted 23 March 2006), states that if a substance consists of “constituents with different chain-lengths, degree and/or site of branching or stereo-isomers, even in their most purified commercial forms” and “it is anticipated that a sequential biodegradation of the individual structures is taking place, then the 10-day window should not be applied to interpret the results of the test.” The 10-day time-window should therefore be ignored as a pass / fail criterion for Myraldyl acetate. Thus, Myraldyl acetate should be regarded as readily biodegradable according to this test based only on the biodegradation percentage of 67% at day 28.