Isostearic acid, esters with methyl α-D-glucoside

Biodegradation in water: screening tests

Description of key information

Isostearic acid, esters with methyl α-D-glucoside  is readily biodegradable. With activated sludge as inoculum, biodegradation reached approximately 76 % in 28 days. The value is supported by read across to Stearic acid, esters with methyl α-D-glucoside. In this study according to OECD TG 301 D 81 to 89 % were degraded by O2 consumption in 28 days. 

Key value for chemical safety assessment

Biodegradation in water:

readily biodegradable

Additional information

The ready biodegradation of Isostearic acid, esters with methyl α-D-glucoside was investigated in a study conducted according to OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test), EU Method C.4-C (Determination of the "Ready" Biodegradability - Carbon Dioxide Evolution Test), and ISO DIS 9439 (Ultimate Aerobic Biodegradability - Method by Analysis of Released Carbon Dioxide) over a period of 28 days and using activated sludge as inoculum obtained from a municipal sewage treatment plant receiving predominantly domestic sewage. The biodegradation rate was determined by measurement of CO2 evolution. Inoculum blank, procedural/functional control with the reference substance sodium acetate, and toxicity control using ca. 34 mg/L test substance and 40 mg/L reference compound were performed.

The test item proved to be readily biodegradable (76% biodegradation on average within 28 d). According to the revised OECD Guidelines the 10-d window should not be applied to interpret the results of a test with a mixture of structurally similar chemicals. The functional control reached the pass level >60% after 14 d. In the toxicity control containing both test and reference substance 63% biodegradation based on ThCO2 occurred within 14 d thus indicating that the test item was not inhibitory at the concentration tested.