Pulsed Electric Fields-Assisted Drying and Frying of Fresh Zucchini

Pulsed Electric Fields-Assisted Drying and Frying of Fresh Zucchini

The objective of this work was to evaluate the potential of Pulsed Electric Field application on the enhancement of air-drying and frying kinetics of zucchini in terms of quality of final zucchini products. PEF-caused electroporation could enhance drying process, facilitating moisture removal with r...

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Bibliographic Details
Published in:Food and bioprocess technology Vol. 14; no. 11; pp. 2091 - 2106
Main Authors: Andreou, V., Dimopoulos, G., Tsonas, T., Katsimichas, A., Limnaios, A., Katsaros, G., Taoukis, P.
Format: Journal Article
Language:English
Published: New York Springer US 01-11-2021
Springer Nature B.V
Subjects:
Agriculture
Biotechnology
Browning
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Diffusion coefficient
Disintegration
Drying
Electric field strength
Electric fields
Electroporation
Energy conservation
Energy consumption
Food Science
Frying
Moisture removal
Oil
Vegetables
Water loss
Pulsed electric fields
Zucchini
Frying
Oil uptake
Texture
Energy savings
Drying
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Summary:The objective of this work was to evaluate the potential of Pulsed Electric Field application on the enhancement of air-drying and frying kinetics of zucchini in terms of quality of final zucchini products. PEF-caused electroporation could enhance drying process, facilitating moisture removal with reduced energy consumption, or soften the surface, leading to fried products with reduced oil content. Fresh whole zucchinis ( Cucurbita pepo ) were PEF treated at 0.5–1.5 kV cm −1 electric field strength for up to 0.5 s, achieving a cell disintegration index in the range of 0.12 to 0.77 (0.5–110 kJ kg −1 ). Drying experiments of zucchini slices were carried out at mild drying temperatures 40–70 °C. The moisture diffusion coefficients D eff of all studied samples were compared. Deep frying of untreated and PEF treated (1.5 kV cm −1 , 500 pulses, Z equal to 0.6, PEF energy input 8.2 kJ kg −1 ) zucchini slices was carried out at temperatures 150–170 °C for 0–12 min. Water loss, oil uptake and browning index were determined for all studied samples. The obtained results indicate a potential benefit of PEF on drying rates of zucchini tissues. At low drying temperatures, PEF treated samples increased the effective moisture diffusivity D eff up to 35%, reducing the corresponding drying time up to 25 min and leading to energy savings of 169 MJ kg −1 compared to the untreated sample. In addition, PEF treatment led to final fried zucchinis with reduced oil content up to 36% compared to untreated samples while maintaining the same levels of desirable brown color.
ISSN:1935-5130
1935-5149
DOI:10.1007/s11947-021-02705-z