Melting properties of some structured lipids native to high stearic acid soybean oil

Authors

  • G. R. List Food and Industrial Oil Research, National Center for Agricultural Utilization
  • R. O. Adlof Food and Industrial Oil Research, National Center for Agricultural Utilization
  • C. J. Carrierre Food and Industrial Oil Research, National Center for Agricultural Utilization
  • R. O. Dunn Food and Industrial Oil Research, National Center for Agricultural Utilization

DOI:

https://doi.org/10.3989/gya.2004.v55.i2.157

Keywords:

Differential scanning calorimetry, Heats of fusion, Mettler dropping point, Nuclear magnetic resonance, Soybean oil, Structured lipids

Abstract


A number of structured lipids native to high stearic acid soybean oil were synthesized and their physical properties were determined by pulsed nuclear magnetic resonance (NMR), Mettler dropping point and differential scanning calorimetry (DSC). 1,3 Distearo-2-olein (SOS), 1,3 distearo-2-linolein (SLS) and1,3 distearo-2-linolenin (SlnS) were synthesized from pure 1,3 diacylglycerols and the appropriate fatty acid. Pulsed NMR determinations over the temperature range 10-50 ºC showed that the symmetrical triacylglycerols (SUS: where S = stearic, U = oleic, linoleic or linolenic) are high and sharply melting materials, all showing substantial amounts of solids at temperatures up to 33.3 ºC, yet are completely melted at only a few degrees higher. Mettler dropping points for SOS, SLS and SlnS were 44.1, 37.9 and 36.5 ºC respectively. The heats of fusion for the structured triacylglycerols were determined by DSC and shown to be of the order 29-32 cal/gm compared to 45 cal/gm for SSS. The heats of fusion were also calculated from Mettler dropping point determinations as admixtures with soybean oil and showed consistent agreement with the DSC data.

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Published

2004-06-30

How to Cite

1.
List GR, Adlof RO, Carrierre CJ, Dunn RO. Melting properties of some structured lipids native to high stearic acid soybean oil. grasasaceites [Internet]. 2004Jun.30 [cited 2022Dec.1];55(2):135-7. Available from: https://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/157

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Section

Research

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