Sucrose and glycerol, reaction products with C12-18, C18unsatd. fatty acids

Endpoint summary

Additional information

Sucroglyceride C12‐18, C18unsatd. is readily biodegradable and fulfils the 10 d window criterion, based on the test results of a study conducted according to OECD Guideline 301 D (closed bottle test) using domestic sewage as inoculum.

The anaerobic biodegradation of Sucroglyceride C12-18, C18unsatd. was investigated in a study conducted according to ECETOC Technical Report no 28/SS-EN ISO 11734 over a period of 70 days and using digested sludge as inoculum. The test item proved to be completely anaerobic biodegradable, as biodegradation 75%-80% of theoretical gas production was achieved.

Due to ready biodegradability under aerobic conditions as well as anaerobic biodegradability no further investigations on biodegradation are considered necessary in accordance with REACH Regulation Annex IX, 9.2.1.3, column 2 (soil) and Annex IX, 9.2.1.4. (sediment).

According to REACH Regulation, Annex VIII, 9.2.2.1, column II a study on hydrolysis as a function of pH does not need to be conducted as the substance is readily biodegradable.

According to REACH Regulation (Annex IX, 9.3.2, column II), a test for bioaccumulation in aquatic species does not need to be conducted as the substance has a low potential for bioaccumulation. Its rapid biotic degradation in water leads to negligibly low concentrations of Sucroglyceride C12 -18, C18unsatd. in the aquatic environment and thus to insignificant concentrations in aquatic organisms. In addition, in case of ester fission, Sucroglyceride C12-18, C18unsatd. consisting of sucrose, glycerol and fatty acids is likely to be rapidly metabolised in organisms.

Although ready biodegradability as well as anaerobic biodegradability has been shown for the substance, a calculation to estimate the adsorption/desorption potential of Sucroglyceride C12-18, C18unsatd. is provided. A calculation of a single Koc for the UVCB substance is not feasible. Thus, the Koc of the main constituents of Sucroglyceride C12-18, C18unsatd. were calculated separately using EPI suite v4.00 KOCWIN v2.00. As a log Kow below 3 and high water solubility indicates no potential for adsorption, it was not considered necessary to calculate Koc for Sucrose and Glycerol (log Kow of -3.7 and -1.76, respectively; water solubility 2.12E+06 mg/L and 5.30E+06 mg/L, respectively).

The calculated log Koc of the fatty acids (Lauric acid, Myristic acid, Palmitic acid, Stearic acid) were in the range of 2.58 to 4.59, increasing with higher chain length.

The log Koc of the monoglycerides were in the range of 2.18 to 4.07, indicating no strong binding potential to soil particles. Although the model is only valid for undissociated substances, and Lauric acid, Myristic acid, Palmitic acid and Stearic acid are weak acids which will exist almost entirely in the anion form in the environment, anions generally do not adsorb more strongly to soil containing organic carbon and clay than their neutral counterparts. It is therefore assumed that the adsorption potential for the dissociated forms is not higher.