Differential scanning calorimetric analysis of edible oils: Comparison of thermal properties and chemical composition

The thermal profiles of 17 edible oil samples from different plant origins were examined by differential scanning calorimetry (DSC). Two other confirmatory analytical techniques, namely gas‐liquid chromatography (GLC) and high‐performance liquid chromatography (HPLC), were used to determine fatty ac...

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Bibliographic Details
Published in:Journal of the American Oil Chemists' Society 2000-02, Vol.77 (2), p.143-155
Main Authors: Tan, C. P., Che Man, Y. B.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Composition effects
Crystallization
differential scanning calorimetry
edible oil
Fat industries
fatty acid composition
Fatty acids
Food industries
Fundamental and applied biological sciences. Psychology
gas chromatography
General aspects
Glycerol
High performance liquid chromatography
Iodine
Melting
Methods of analysis, processing and quality control, regulation, standards
Plants (botany)
Saturation (materials composition)
thermal properties
Thermodynamic properties
triacylglycerol composition
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Summary:The thermal profiles of 17 edible oil samples from different plant origins were examined by differential scanning calorimetry (DSC). Two other confirmatory analytical techniques, namely gas‐liquid chromatography (GLC) and high‐performance liquid chromatography (HPLC), were used to determine fatty acid (FA) and triacylglycerol (TAG) compositions. The FA and TAG compositions were used to complement the DSC data. Iodine value (IV) analysis was carried out to measure the degree of unsaturation in these oil samples. The DSC melting and crystallization curves of the oil samples are reported. The contrasting DSC thermal curves provide a way of distinguishing among these oil samples. Generally, the oil samples with a high degree of saturation (IV65). Each thermal curve was used to determine three DSC parameters, namely, onset temperature (To), offset temperature (Tf) and temperature range (difference between To and Tf). Reproducibility of DSC curves was evaluated based on these parameters. Satisfactory reproducibility was achieved for quantitation of these DSC parameters. The results show that To of the crystallization curve and Tf of the melting curve differed significantly (P
ISSN:0003-021X
1558-9331
DOI:10.1007/s11746-000-0024-6