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Characterization of fatty acid methyl esters by thermal analysis

  • Pharmaceutical & Organic Compounds
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Abstract

The thermal stability of selected straight-chain (C6-C14) esters of fatty acids has been studied by TG-DTG and DTA analysis. In DTG, a peak is detected between 84° and 125° C followed by a main effect in the range 105°–215°C, whereas in DTA only an exothermic peak appears in the range of 126.5° to 187°C (onset temperatures). The temperatures of these effects have been related with ignition points, molecular weights and boiling points.

The characteristics of melting and recrystallization of the above fatty acid methyl esters and those with carbon numbers between C14 and C24 have been established by DSC along the melting range between −83° and 50°C. Polymorphism appears in caproic, heptanoic, palmitic and stearic acid methyl esters.

Zusammenfassung

Mittels TG-DTG und DTA wurde die thermische Stabilität einiger ausgewählter geradkettiger (C6-C14) Fettsäureester untersucht. In der DTG-Kurve wird ein Peak zwischen 84° und 125°C beobachtet, gefolgt von einem großen Effekt im Bereich 105°–215°C, wobei in der DTA-Kurve im Bereich 126,5° bis 187° (onset-Temperaturen) nur ein einziger exothermer Peak erscheint. Die Temperaturen dieser Effekte wurden dem Zündungspunkt, den Molekülgewichten und den Siedepunkten zugeordnet.

Mittels DSC wurden im Schmelzbereich zwischen −83° und 50°C die Schmelz- und Rekristallisationsmerkmale obiger Fettsäuremethylester und solcher mit einer Kohlenstoffatomanzahl zwischen C14 und C24 ermittelt. Polymorphie tritt in den Methylestern von Kapron, Heptyl, Palmitin-und Stearinsäure auf.

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Authors and Affiliations

  1. Laboratorio de Analisis Térmico, E.T.S.I.I. Universidad de Valladolid, Spain

    F. J. Rey, O. Chamorro, F. J. Martín Gil & J. Martín Gil

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  1. F. J. Rey
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  2. O. Chamorro
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  3. F. J. Martín Gil
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  4. J. Martín Gil
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Rey, F.J., Chamorro, O., Martín Gil, F.J. et al. Characterization of fatty acid methyl esters by thermal analysis. Journal of Thermal Analysis 40, 463–473 (1993). https://doi.org/10.1007/BF02546615

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