Registration Dossier
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EC number: 270-156-4 | CAS number: 68411-97-2
Endpoint summary
Administrative data
Description of key information
Additional information
Glycine, N-methyl-, N-coco acyl derivatives (CAS 68411-97-2) is an ionisable UVCB substance characterized by a low water solubility of < 0.5 mg/L and a log Kow of 4.4 (23 °C, OECD 117). Since there is only limited experimental data available for the environmental fate of the substance, QSAR calculations were performed to estimate the log D, the dissociation constant (pKa) and the log Koc values of the two main constituents of the substance, i.e. Myristoyl sarcosine (CAS 52558-73-3) and Lauroyl sarcosine (CAS 97-78-9).
The calculated pKa values of both molecules is 3.96, indicating that the ionized, charged anionic forms will predominate at environmentally relevant pH values in the range of 4 to 9. The SPARC model predicts that the acid form constitutes 47.4% at pH 4, 0.1% at pH 7 and 0% at pH 9, at which point the molecules completely dissociate into the corresponding anionic forms.
The estimated log Koc (ChemProp v6.5, Franco, Fu & Trapp for ionizable substances) is 3.38 at pH 4, 2.07 at pH 7, and 2.02 at pH 9, indicating a moderate potential for adsorption to particles present in soil and sediment in neutral to basic environments and a slightly higher potential for adsorption in more acidic environments. Thus, based on the water solubility and predicted log Koc values, only low concentrations of the substance are expected in water with moderate mobility at environmentally relevant pH values of around 7.
Glycine, N-methyl-, N-coco acyl derivatives (CAS 68411-97-2) has a log D of 0.61 to 1.52 at pH 7 and of -0.30 to 0.63 at pH 9 (SPARC v4.6), indicating low lipophilicity at environmentally relevant pH ranges. Thus, according to REACh regulation (EC) No 1907/2006 the substance has a low potential for bioaccumulation at the environmentally relevant pH of 7 and 9 (log D is ≤ 3.0). Furthermore, the predicted BCF values provide further evidence that the potential for bioaccumulation is low. The calculated BCF values range from 3.0 to 194.5 L/kg wet-wt and are thus well below the threshold value of 2000 L/kg for bioaccumulative substances, as laid down by the REACH regulation (EC) No 1907/2006, section 1 of Annex XIII.
Moreover, the substance is readily biodegradable based on standard biodegradation studies with two structurally and chemically closely related source substances (85.2% in 28 d, OECD 301 B, activated sludge). Consequently, abiotic degradation via hydrolysis is not a relevant degradation pathway. According to the Guidance on information requirements and chemical safety assessment, Chapter R.7b, readily biodegradable substances can be expected to undergo rapid and ultimate degradation in most environments, including biological sewage treatment plants (ECHA, 2016). Therefore, the substance will not persist in the environment. Hence, the overall bioavailability to aquatic organisms is expected to be low due to poor solubility on the one hand and minimal release and persistence due to ready biodegradability on the other hand.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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