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A Novel System—the Simultaneous Use of Ohmic Heating with Convective Drying: Sensitivity Analysis of Product Quality Against Process Variables

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Abstract

The experimental sensitivity analysis of the novel ohmic assisted drying system (OAD: simultaneous use of ohmic heating and convectional air drying), which was developed as an alternative to the traditional method, was carried out for the first time. Within the scope of the study, changes in drying time, drying characteristics and some quality parameters were examined by changing the controlled parameters (applied voltage, temperature and air velocity) of the new OAD system. For this purpose, potato, which is an important commercial food in the European continent, was used as raw material. The optimum levels of OAD were calculated as approximately 60 °C for drying temperature, 112 V for applied voltage and any value between 1.07 and 1.98 m/s for air velocity to minimise drying time, browning index and to maximise effective diffusivity corresponding to accelerated drying period, b* colour value. According to the results, a 32–38% improvement was achieved in drying time compared to the traditional method. In addition, no negative effect was observed on the quality properties of potato slices dried under optimum conditions compared to the control samples. Moreover, it appears as an advantage that the new method provides partial pre-gelatinisation of starch molecules, which is important for the food industry. OAD will also save both time and economy by removing the need for the blanching stage in drying processes due to the obtained significant enzyme inactivation. Considering the results, it is seen that the newly developed technique has a promising potential both for the food industry and the literature.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This research was financially supported by “Süleyman Demirel University Scientific Research Projects Office”, Turkey (Project ID: FDK-2019-6978). Sebahattin Serhat Turgut is supported under postgraduate scholarship (2211-C) of “The Scientific and Technical Research Council of Turkey (TÜBİTAK)”. The authors thank all supporting organisations.

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  1. Department of Food Engineering, Faculty of Engineering, Suleyman Demirel University, Isparta, Turkey

    Sebahattin Serhat Turgut, Erkan Karacabey & Erdoğan Küçüköner

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Turgut, S.S., Karacabey, E. & Küçüköner, E. A Novel System—the Simultaneous Use of Ohmic Heating with Convective Drying: Sensitivity Analysis of Product Quality Against Process Variables. Food Bioprocess Technol 15, 440–458 (2022). https://doi.org/10.1007/s11947-022-02765-9

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