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EC number: 224-292-6
CAS number: 4292-10-8
In a study conducted according to OECD Guideline 102, the melting point
of C12 AAPB was investigated using differential scanning calorimetry
(DSC). The DSC-curve showed in the first heating run a defined
endothermic signal in the range between 30 and 100°C.
The peak at ca. 76°C with an offset temperature of 66°C has a heat flow
of approx. 113 J/g. This is within the typical range for melting
processes of an organic material. Further DSC tests in the temperature
range -70 to 130°C with three heating cycles were done. However, in the
cooling runs and the following second and third heating runs no peak was
observed in the range of 76°C. A further big peak was observed in the
range from 190 to 260°C. The heat flow, proportional to the peak area
was determined as ca. 128 J/g. This is also within the typical range for
melting processes of an organic material. However, both in the cooling
run and the following second heating run no peak was observed in the
range of 238°C as is expected for a typical, reversible melting process.
Hence the signal observed at 76 and 238°C during the first heating run
does not reflect typical melting processes, but processes when C12 AAPB
decomposes, possibly associated with a melting process. In summary, a
melting point was not identifyable due to decomposition of the test
Coco AAPB: fraction C8/C18: m.p.: 208°C; fraction C8/C10: m.p.: 55-60°C; fraction C12/C14: m.p.: 69-187°CC8-18 AAPB: not identifyable due to decomposition of the test substance in the range between 208 and 280°CC12 AAPB: not identifyable due to decomposition of the test substance in the range between 60 and 260°C
In studies conducted according to OECD Guideline 102, the melting points
of C8 -18 AAPB and C12 AAPB were investigated using differential
scanning calorimetry (DSC). Melting points were not identifyable due to
decomposition at temperature ranging from 208 to 280 (C8 -18 AAPB) and
60 and 260°C (C12 AAPB). Based on these results it can be assumed that a
weak chemical bond is present in the molecule which is unstable towards
elevated temperatures. All
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 no or at the most a minor impact on this
The melting points of the different fractions of Coco AAPB determined
via the capillary method are judged as not reliable as the method does
not distinguish between a real melting process and a
reaction/decomposition process and as comparable temperatures were found
as decompostion temperature in the DSC measurements.
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