Registration Dossier
Registration Dossier
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EC number: 266-124-4 | CAS number: 66085-00-5
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
log koc: 2.95 - 13.96 (MCI)
Key value for chemical safety assessment
Additional information
Experimental data on the adsorption potential of Glycerol monoisostearate (CAS 66085-00-5) are not available. The composition of the substance includes the mono- di- and tri-glyceride of isostearate. For each of these forms, the iso-branching may be present as a methyl-, ethyl or propyl-branching, although the branching is always simple. For the calculation of the adsorption potential only the methyl branching was considered since the calculation with QSAR (KOCWIN Program (v2.00)) revealed very similar or equal results for the branching types. Values calculated with KOCWIN Program (v2.00) indicate a medium potential of adsorption (Birkhofer, 2014). Calculations for the substance main components based on the molecular conductivity index (MCI) resulted in log Koc values ranging from 2.95 – 13.96. The log Kow values estimated for the C18 di- and the C18 triester components are outside the Kow range of the training set of the MCI method (log kow: -2.11 - 9.10). Therefore the log Koc values of 7.81 and 13.96 respectively obtained for the two components should be taken with caution. The definite values may not be fully reliable but indicate a high adsorption potential. Generally, longer fatty acid C-chain lengths and higher degrees of esterification (diester, triester) are expected to show higher adsorption potential than shorter and monoester fatty acids, for which reliable values are available. Considering the estimated log Koc range for this substance of 2.95 – 13.96, a high adsorption potential cannot be excluded.
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