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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable: 94.4% in 28 days (OECD 301E, read across)

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

No studies investigating the ready biodegradability of Reaction mass of sodium hydrogen N-(1-oxooctadecyl)-L-glutamate and stearic acid are available. Thus, available data for the source substance L-Glutamic acid, N-coco acyl derivs., monosodium salts (CAS No. 68187-32-6) was used in a read across approach. The substances are structurally very similar containing identical functional groups only differing in the length of its carbon side chain. Although the read across substance l-Glutamic acid, N-coco acyl derivs., monosodium salts also contains components with shorter carbon side chains compared to L-Glutamic acid, N-(1-oxooctadecyl)-, monosodium salt, the read across can be considered valid, because i) the very rapid and almost full degradation of the analogue substance indicate that even the longer-chained components (C18) will be degraded easily and ii) the relevant physico-chemical properties (water solubility = high, log Kow < 1) are identical, which assume identical environmental behavior and fate. Additionally, biodegradation results for the main component stearic acid (CAs No. 57-11-4) was used as supporting information.

The read across key study was performed according to OECD guideline 301E using polyvalent microorganisms as inoculum (Hoechst, 1989). Test substance concentrations of 4 – 50 mg DOC/L were tested. The test substance showed a biodegradation of 81.4% after 7 days and 94.4% after an incubation period of 28 days. Thus, the substance can be regarded readily biodegradable according to OECD criteria. In a supporting study it can be shown that stearic acid is similarly biodegradable (95 % in 21 days) under aerobic conditions (Ruffo et al, 1984).

On the basis of these results it can be considered that Reaction mass of sodium hydrogen N-(1-oxooctadecyl)-L-glutamate and stearic acid is also readily biodegradable.