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Microwave pre-treatment of canola seeds and flaked seeds for increased hot expeller oil yield

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Abstract

Microwave (MW) pre-treatment of canola seeds or flaked seeds was found to be a superior alternative to the conventional thermal pre-treatment (steam). Flaked seeds were “cooked” (heat-treated) with steam or using microwave treatments in the temperature range of 62–130 °C prior to expeller pressing. Microwave cooking at 100 °C resulted in the highest increase in the pressed oil yield, which is an increase of 3.7% (w/w) on a pressed oil basis or 9.0% (oil in seed basis) compared with steam cooking. Whole canola seeds conditioning was conducted with microwaves or steam, in the temperature range of 40–75 °C, followed by microwave or steam cooking at 100 °C to evaluate the effect of MW treatment during conditioning on the expeller oil yield. The use of a continuous microwave process for combined conditioning of whole seeds at 55 °C and subsequent cooking of flaked seeds at 100 °C resulted in a 4.0% increase in expeller oil yield, compared with steam conditioning and cooking. The influence of dry basis (db %) moisture contents of 5%, 11.5%, and 16.5% on oil yield after steam or MW treatments of seeds and flaked seeds was also studied. The moisture content of 11.5% (db %) yielded the highest net oil yield for both MW and steam at best conditioning and cooking temperatures of 55 °C and 100 °C, respectively. No significant impact of MW cooking was seen on oil quality compared with conventional steam cooking.

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Acknowledgements

The authors acknowledge Mr. Alan Thomson (Cargill CO, Melbourne, Victoria, Australia) for his contribution in this work.

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Authors and Affiliations

  1. School of Chemical Engineering, The University of New South Wales, Sydney, NSW, Australia

    Mohammed A. Fouad M. Gaber & Francisco J. Trujillo

  2. CSIRO Agriculture and Food, Melbourne, VIC, Australia

    Mohammed A. Fouad M. Gaber, Maged Peter Mansour & Pablo Juliano

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  1. Mohammed A. Fouad M. Gaber
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  2. Maged Peter Mansour
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  3. Francisco J. Trujillo
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  4. Pablo Juliano
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Correspondence to Francisco J. Trujillo.

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Gaber, M.A.F.M., Mansour, M.P., Trujillo, F.J. et al. Microwave pre-treatment of canola seeds and flaked seeds for increased hot expeller oil yield. J Food Sci Technol 58, 323–332 (2021). https://doi.org/10.1007/s13197-020-04545-9

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  • DOI: https://doi.org/10.1007/s13197-020-04545-9

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