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The Impact of Blanching and High-Pressure Pretreatments on Oil Uptake of Fried Potato Slices

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Abstract

The effect of high-pressure (HP) pretreatment on oil uptake of potato slices is examined in this paper. Potato slices were treated either by HP or thermal blanching, or a combination of thermal blanching followed by HP prior to frying. The effect of HP on starch gelatinization and potato microstructure was assessed by differential scanning calorimeter and environmental scanning electron microscope (ESEM), respectively. After treatments, the slices were fried in sunflower oil at 185 °C for a predetermined time. Frying time was either kept constant (4 min) or varied according to the time needed to reach a desired moisture content of ≈2%. The high pressure applied in this study was found not to be sufficient to cause a significant degree of starch gelatinization. Analysis of the ESEM images showed that blanching had a limited effect on cell wall integrity. HP pretreatment was found to increase the oil uptake marginally. When frying for a fixed time, the highest total oil content was found in slices treated at 200 MPa for 5 min. The oil content was found to increase significantly (p < 0.05) to 41.23 ± 1.82 compared to 29.03 ± 0.21 in the control slices. The same effect of pressure on oil content was found when the time of frying varied. On the other hand, HP pretreatment was found to decrease the frying time required to achieve a given moisture content. Thus, high-pressure pretreatment may be used to reduce the frying time, but not oil uptake.

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Acknowledgments

The authors thank the Sultan Qaboos University (SQU) for the financial support of this work. They also thank Dr. Hong Wei, School of Systems Engineering, University of Reading for her help using Matlab software for image processing.

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  1. Department of Food and Nutritional Sciences, University of Reading, Whiteknights, P.O. Box 226, Reading, Berkshire, RG6 6AP, UK

    Mohammed K. Al-Khusaibi & Keshavan Niranjan

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  1. Mohammed K. Al-Khusaibi
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  2. Keshavan Niranjan
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Correspondence to Mohammed K. Al-Khusaibi.

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Al-Khusaibi, M.K., Niranjan, K. The Impact of Blanching and High-Pressure Pretreatments on Oil Uptake of Fried Potato Slices. Food Bioprocess Technol 5, 2392–2400 (2012). https://doi.org/10.1007/s11947-011-0562-2

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