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Heating effect on the DSC melting curve of flaxseed oil

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Abstract

Flaxseed oil is rich in the alpha-linolenic acid. The effect of heating on the thermal properties of flaxseed oil extracted from flax seeds has been investigated. The flaxseed oils were heated at a certain temperature (75, 105, and 135 °C, respectively) for 48 h. The melting curve (from −75 to 100 °C) of flaxseed oil was determined by differential scanning calorimetry (DSC) at intervals of 4 h. Three DSC parameters of exothermic event and endothermic event, namely, peak temperature (T peak), enthalpy, and temperature range were determined. The initial flaxseed oil exhibited an exothermic peak, two endothermic peaks, and two endothermic shoulders between −68 and −5 °C in the melting profile. Heating temperature had a significant influence on the oxidative deterioration of flaxseed oil. The melting curve and parameters of flaxseed oil were almost not changed when flaxseed oil was heated at 75 °C. However, the endothermic peaks of melting curve decreased dramatically with the increasing of heating time when heating temperature was above 105 °C. There is almost no change of melting heat flow of flaxseed oil when heating time exceeded 32 h at 135 °C. The preliminary results suggest that the DSC melting profile can be used as a fast and direct way to assess the deterioration degree of flaxseed oil.

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Acknowledgments

Research support was provided by the National Natural Science Foundation of China (No. 31101367), High-level talent fund of Henan University of Technology (2011BS012), and the Research and Development Fund for University’s Doctoral Discipline of the Chinese Ministry of Education (No. 20050019029).

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Authors and Affiliations

  1. College of Food Science and Technology, Henan University of Technology, No. 1, Lotus Flower Street, Zhengzhou, 450001, People’s Republic of China

    Zhen-Shan Zhang, Yu-lan Liu & Xue-de Wang

  2. College of Engineering, China Agricultural University, 17 Qinghua Donglu, Beijing, 100083, People’s Republic of China

    Dong Li

  3. Xinyang Agricultural Research Institute, Xinyang, 464000, People’s Republic of China

    Li-Xia Zhang

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  1. Zhen-Shan Zhang
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  2. Dong Li
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  3. Li-Xia Zhang
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  4. Yu-lan Liu
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  5. Xue-de Wang
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Correspondence to Zhen-Shan Zhang.

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Zhang, ZS., Li, D., Zhang, LX. et al. Heating effect on the DSC melting curve of flaxseed oil. J Therm Anal Calorim 115, 2129–2135 (2014). https://doi.org/10.1007/s10973-013-3270-5

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  • DOI: https://doi.org/10.1007/s10973-013-3270-5

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