Abstract
Pulsed electric field (PEF) was used as a pre-treatment to investigate the oil intake and color of zucchini and eggplant slices after frying. Samples were PEF-treated at 1.0 kV/cm of electric field strength, and 1.0 kJ/kg (PEF1) and 3.0 kJ/kg (PEF3) of specific energy inputs. Frying was performed at 180 °C for 2 min. PEF3 treatment of zucchini reduced the oil content (> 32%) significantly compared to control samples whereas statistically same oil contents were obtained for eggplant. No significant differences were observed for the moisture contents of PEF-treated and untreated zucchini samples. On the other hand, moisture change was noticeable for the eggplant. Higher browning index values were calculated for PEF-treated vegetables, but this seemed to be highly dependent on specific energy inputs. Results revealed that PEF processing can be used before deep frying to reduce the oil content of zucchini with the formation of desired brown color.
Data Availability
The datasets generated during the current study are available from the corresponding author on request.
References
Andreou, V., Dimopoulos, G., Tsonas, T., Katsimichas, A., Limnaios, A., Katsaros, G., & Taoukis, P. (2021). Pulsed electric fields-assisted drying and frying of fresh zucchini. Food and Bioprocess Technology, 14(11), 2091–2106. https://doi.org/10.1007/s11947-021-02705-z
Bilge, G., Yurdakul, M., Buzrul, S., & Bulut, O. (2022). Evaluation of the effect of pulsed electric field on coffee Arabica beans. Food and Bioprocess Technology, in Press,. https://doi.org/10.1007/s11947-022-02802-7
Bouchon, P. (2009). Chapter 5 Understanding oil absorption during deep‐fat frying. In G. F. Stewart, E. M. Mrak, C. O. Chichester, B. S. Schweigert, J. E. Kinsella & S. L. Taylor (Eds.), Advances in food and nutrition research 57, 209–234. Academic Press. https://doi.org/10.1016/S1043-4526(09)57005-2
Bouchon, P., & Aguilera, J. M. (2001). Microstructural analysis of frying potatoes. International Journal of Food Science & Technology, 36(6), 669–676. https://doi.org/10.1046/j.1365-2621.2001.00499.x
Boussetta, N., Grimi, N., Lebovka, N. I., & Vorobiev, E. (2013). “Cold” electroporation in potato tissue induced by pulsed electric field. Journal of Food Engineering, 115(2), 232–236. https://doi.org/10.1016/j.jfoodeng.2012.10.019
Dueik, V., Moreno, M. C., & Bouchon, P. (2012). Microstructural approach to understand oil absorption during vacuum and atmospheric frying. Journal of Food Engineering, 111(3), 528–536. https://doi.org/10.1016/j.jfoodeng.2012.02.027
El Darra, N., Rajha, H. N., Ducasse, M.-A., Turk, M. F., Grimi, N., Maroun, R. G., Louka, N., & Vorobiev, E. (2016). Effect of pulsed electric field treatment during cold maceration and alcoholic fermentation on major red wine qualitative and quantitative parameters. Food Chemistry, 213, 352–360. https://doi.org/10.1016/j.foodchem.2016.06.073
Gagneten, M., Leiva, G., Salvatori, D., Schebor, C., & Olaiz, N. (2019). Optimization of pulsed electric field treatment for the extraction of bioactive compounds from blackcurrant. Food and Bioprocess Technology, 12(7), 1102–1109. https://doi.org/10.1007/s11947-019-02283-1
Fauster, T., Schlossnikl, D., Rath, F., Ostermeier, R., Teufel, F., Toepfl, S., & Jaeger, H. (2018). Impact of pulsed electric field (PEF) pretreatment on process performance of industrial French fries production. Journal of Food Engineering, 235, 16–22. https://doi.org/10.1016/j.jfoodeng.2018.04.023
Ignat, A., Manzocco, L., Brunton, N. P., Nicoli, M. C., & Lyng, J. G. (2015). The effect of pulsed electric field pre-treatments prior to deep-fat frying on quality aspects of potato fries. Innovative Food Science & Emerging Technologies, 29, 65–69. https://doi.org/10.1016/j.ifset.2014.07.003
ISO. (1988). International Organization for Standardization, ISO 659, 2nd ed., 15 February 1988.
Janositz, A., & Knorr, D. (2010). Microscopic visualization of pulsed electric field induced changes on plant cellular level. Innovative Food Science & Emerging Technologies, 11(4), 592–597. https://doi.org/10.1016/j.ifset.2010.07.004
Janositz, A., Noack, A. K., & Knorr, D. (2011a). Pulsed electric fields and their impact on the diffusion characteristics of potato slices. LWT - Food Science and Technology, 44(9), 1939–1945. https://doi.org/10.1016/j.lwt.2011.04.006
Janositz, A., Semrau, J., & Knorr, D. (2011b). Impact of PEF treatment on quality parameters of white asparagus (Asparagus officinalis L.). Innovative Food Science & Emerging Technologies, 12(3), 269–274. https://doi.org/10.1016/j.ifset.2011.02.003.
Kalogeropoulos, N., Mylona, A., Chiou, A., Ioannou, M. S., & Andrikopoulos, N. K. (2007). Retention and distribution of natural antioxidants (α-tocopherol, polyphenols and terpenic acids) after shallow frying of vegetables in virgin olive oil. LWT - Food Science and Technology, 40(6), 1008–1017. https://doi.org/10.1016/j.lwt.2006.07.003
Krokida, M. K., Oreopoulou, V., Maroulis, Z. B., & Marinos-Kouris, D. (2001). Colour changes during deep fat frying. Journal of Food Engineering, 48(3), 219–225. https://doi.org/10.1016/S0260-8774(00)00161-8
Lammerskitten, A., Wiktor, A., Mykhailyk, V., Samborska, K., Gondek, E., Witrowa-Rajchert, D., & Toepfl, & S., Parniakov, O. (2020). Pulsed electric field pre-treatment improves microstructure and crunchiness of freeze-dried plant materials: Case of strawberry. LWT - Food Science and Technology, 134, 110266. https://doi.org/10.1016/j.lwt.2020.110266
Li, J., Shi, J., Huang, X., Wang, T., Zou, X., Li, Z., Wen Zhang, D. Z., & Xu, Y. (2020). Effects of pulsed electric field pretreatment on frying quality of fresh-cut lotus root slices. LWT - Food Science and Technology, 132, 109873. https://doi.org/10.1016/j.lwt.2020.109873
Liu, T., Dodds, E., Leong, S. Y., Eyres, G. T., Burritt, D. J., & Oey, I. (2017). Effect of pulsed electric fields on the structure and frying quality of “kumara” sweet potato tubers. Innovative Food Science and Emerging Technologies, 39, 197–208. https://doi.org/10.1016/j.ifset.2016.12.010
Liu, C., Pirozzi, A., Ferrari, G., Vorobiev, E., & Grimi, N. (2020). Effects of pulsed electric fields on vacuum drying and quality characteristics of dried carrot. Food and Bioprocess Technology, 13(1), 45–52. https://doi.org/10.1007/s11947-019-02364-1
Liu, Y., Tian, J., Zhang, T., & Fan, L. (2021). Effects of frying temperature and pore profile on the oil absorption behavior of fried potato chips. Food Chemistry, 345, 128832. https://doi.org/10.1016/j.foodchem.2020.128832
López, N., Puértolas, E., Condón, S., Raso, J., & Ignacio, Á. (2009). Enhancement of the solid-liquid extraction of sucrose from sugar beet (Beta vulgaris) by pulsed electric fields. LWT - Food Science and Technology, 42(10), 1674–1680. https://doi.org/10.1016/j.lwt.2009.05.015
Luengo, E., Franco, E., Ballesteros, F., Álvarez, I., & Raso, J. (2014). Winery trial on application of pulsed electric fields for improving vinification of Garnacha grapes. Food and Bioprocess Technology, 7(5), 1457–1464. https://doi.org/10.1007/s11947-013-1209-2
Martín-Belloso, O., & Sobrino-López, A. (2011). Combination of pulsed electric fields with other preservation techniques. Food and Bioprocess Technology, 4(6), 954–968. https://doi.org/10.1007/s11947-011-0512-z
Mohammadi, A., Rafiee, S., Emam-Djomeh, Z., & Keyhani, A. (2008). Kinetic models for colour changes in kiwifruit slices during hot air drying. World Journal of Agricultural Sciences, 4(3), 376–383.
Ostermeier, R., Hill, K., Dingis, A., Töpfl, S., & Jäger, H. (2021). Influence of pulsed electric field (PEF) and ultrasound treatment on the frying behavior and quality of potato chips. Innovative Food Science & Emerging Technologies, 67, 102553. https://doi.org/10.1016/j.ifset.2020.102553
Quitão-Teixeira, L. J., Aguiló-Aguayo, I., Ramos, A. M., & Martín-Belloso, O. (2008). Inactivation of oxidative enzymes by high-intensity pulsed electric field for retention of color in carrot juice. Food and Bioprocess Technology, 1(4), 364–373. https://doi.org/10.1007/s11947-007-0018-x
Salinas-Roca, B., Elez-Martínez, P., Welti-Chanes, J., & Martín-Belloso, O. (2017). Quality changes in mango juice treated by high-intensity pulsed electric fields throughout the storage. Food and Bioprocess Technology, 10(11), 1970–1983. https://doi.org/10.1007/s11947-017-1969-1
Sánchez-Vega, R., Elez-Martínez, P., & Martín-Belloso, O. (2015). Influence of high-intensity pulsed electric field processing parameters on antioxidant compounds of broccoli juice. Innovative Food Science & Emerging Technologies, 29, 70–77. https://doi.org/10.1016/j.ifset.2014.12.002
Sharma, P., Oey, I., & Everett, D. W. (2014). Effect of pulsed electric field processing on the functional properties of bovine milk. Trends in Food Science & Technology, 35(2), 87–101. https://doi.org/10.1016/j.tifs.2013.11.004
Vorobiev, E., & Lebovka, N. (2010). Enhanced extraction from solid foods and biosuspensions by pulsed electrical energy. Food Engineering Reviews, 2(2), 95–108. https://doi.org/10.1007/s12393-010-9021-5
Xu, Z., Leong, S. Y., Farid, M., Silcock, P., Bremer, P., & Oey, I. (2020). Understanding the frying process of plant-based foods pretreated with pulsed electric fields using frying models. Foods, 9(7), 1–23. https://doi.org/10.3390/foods9070949
Yamsaengsung, R., Rungsee, C., & Prasertsit, K. (2008). Simulation of the heat and mass transfer processes during the vacuum frying of potato chips. Songklanakarin Journal of Science & Technology, 30(1), 109–115.
Zhang, C., Zhao, W., Yan, W., Wang, M., Tong, Y., Zhang, M., & Yang, R. (2021). Effect of pulsed electric field pretreatment on oil content of potato chips. LWT - Food Science and Technology, 135, 110198. https://doi.org/10.1016/j.lwt.2020.110198
Zhao, W., Tang, Y., Lu, L., Chen, X., & Li, C. (2014). Review: Pulsed electric fields processing of protein-based foods. Food and Bioprocess Technology, 7(1), 114–125. https://doi.org/10.1007/s11947-012-1040-1
Acknowledgements
We would like to thank Elea for giving us opportunity to work with their PEF PilotTM equipment and Mr. Erkan Erdem from FIBEX for his efforts to make the PEF device available for more than 2 months.
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Conceptualization: SB, GB; methodology: SB, HİÖ, CB, EK, OA; data analysis: SB, HİÖ, OA; writing—original draft: SB, GB, HİÖ; writing — review and editing: SB, GB, HİÖ, CB, EK. All authors have read and agreed the published version of the manuscript.
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Buzrul, S., Öztürk, H.İ., Bilge, G. et al. Pulsed Electric Field Pre-treatment for Frying of Zucchini and Eggplant: Impacts on Oil Content and Color. Food Bioprocess Technol 15, 1188–1194 (2022). https://doi.org/10.1007/s11947-022-02814-3
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DOI: https://doi.org/10.1007/s11947-022-02814-3