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Monitoring of thermal behavior and decomposition products of soybean oil

An application of synchronous thermal analyzer coupled with Fourier transform infrared spectrometry and quadrupole mass spectrometry

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Abstract

The thermal degradation and corresponding decomposition products of fresh and heat-treated soybean oil were investigated by synchronous thermal analyzer combined with Fourier transform infrared spectrometry and quadrupole mass spectrometry (STA–FTIR–QMS). Two longtime heat-treated soybean oil samples were aforehand prepared by consistently heating the fresh soybean oil for 50 and 100 h, respectively. N2 and simulative air (N2/O2 = 4:1, volume) were used as the thermal reaction gas atmosphere. The results showed that one stage of mass loss appeared in analysis of the all oil samples under N2 atmosphere condition and longtime heat pre-treatment had no effect on the thermal behavior of the soybean oil under N2 atmosphere condition. However, four stages occurred in analysis of both untreated and heat-treated oil samples under the simulative air atmosphere condition. Longtime heat pre-treatment influenced the thermal behavior of the soybean oil in certain extent, which was reflected in the different mass loss values of the four stages. According to the infrared absorption profiles and MS spectra of the released compounds in vapor phase, H2O, CO, CO2, hydrocarbons (such as CH4), and hydroxyl, carbonyl, and carboxyl-contained compounds have been confirmed. Therefore, STA–FTIR–QMS can be suggested as a promising technique for investigating of thermal degradation and monitoring the decomposition products of the evolving substances in edible oils.

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Acknowledgements

The authors would like to heartily thank Prof. Chen Yongmei and her master student Peng Zumao in College of Science of Beijing University of Chemical Technology for their kind help to complete the whole test.

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Authors and Affiliations

  1. National Engineering and Technology Research Center for Fruits and Vegetables, College of Food Science and Nutritional Engineering, China Agricultural University, No. 17, Tsinghua East Road, Haidian District, Beijing, 100083, China

    Qing Zhang, Ahmed S. M. Saleh, Jing Chen, Peiran Sun & Qun Shen

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  1. Qing Zhang
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  2. Ahmed S. M. Saleh
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  3. Jing Chen
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  4. Peiran Sun
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  5. Qun Shen
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Correspondence to Qun Shen.

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Zhang, Q., Saleh, A.S.M., Chen, J. et al. Monitoring of thermal behavior and decomposition products of soybean oil. J Therm Anal Calorim 115, 19–29 (2014). https://doi.org/10.1007/s10973-013-3283-0

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  • DOI: https://doi.org/10.1007/s10973-013-3283-0

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