A study of palmitic-stearic triglycerides and their binary mixtures by differential thermal analysis (DTA) - I - pure triglycerides
1969; Elsevier BV; Volume: 3; Issue: 1 Linguagem: Inglês
10.1016/0009-3084(69)90025-5
ISSN1873-2941
AutoresRoger Perron, J Petit, André Mathieu,
Tópico(s)Food Chemistry and Fat Analysis
ResumoThe cryothermograms of the six pure triglycerides derived from palmitic and stearic acids have been determined by DTA As well as revealing itself to be an excellent method of distinguishing between the positional isomers of the mixed triglycerides, DTA also showed that cooling the triglycerides from the melt at a rate of 1.2°C/min yielded an αL form (except PSP), which on subsequent heating gave the βL form with the symmetrical triglycerides, but the β′L form with the non-symmetrical triglycerides. In the process of cooling melted triglycerides, various forms may appear depending on the rate of cooling. The symmetrical triglycerides, with the exception of SSS, give stable forms more easily than the non-symmetrical triglycerides. Further, a sub-β′L form can be detected in the case of PSP, PSS and SPP.
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