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EC number: 224-292-6
CAS number: 4292-10-8
The test item is visually unlimited soluble in water. Therefore, the
OECD Guideline 105 (column elution method and flask method) is not
applicable. Therefore it was tried to determine the water solubility via
the measurement of the critical micelle concentration (CMC). CMC
measurements were carried out using the autodilution method (reverse
CMC) and an average surface tension vs. concentration curve was
constructed. A well-defined CMC was not observed. However, this could
not be expected for a product with impurities; every component will have
a different CMC if measured individually as a pure substance. The CMC at
20°C of C12 AAPB was determined to be ca. 250 mg/L. Therefore the water
solubility of C12 AAPB molecules is <=250 mg/L.
C8-18 AAPB, C12 AAPB : visually unlimited soluble in water (formation of micelles)C8-18 AAPB molecules: <=400 mg/L at 20°C (based on surface tension/CMC measurements); CMC formation range: 400-900 mg/LC12 AAPB molecules is <=250 mg/L at 20°C (based on surface tension/CMC measurements); CMC: ca. 250 mg/L
(formation of micelles. The water solubilities of C8-18 AAPB and C12
AAPB molecules based on surface tension measurements are <=400 mg/L at
AAPBs are similar in structure, contain all the same zwitterionic
structure. They differ, however, by their carbon chain length
distribution and the degree of unsaturation (<=20%) in the fatty acid
moiety. The content of minor constituents in all products are comparable
and differ to an irrelevant amount. Based on the available data, it can
be assumed that chain length distribution and degree of unsaturation of
the fatty acid chain have a minor impact on this endpoint.
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