Abstract
Physical destruction and thermal treatment are pretreatment methods used to destroy cell membranes and facilitate the release of solute extraction. In this paper, sugar extraction from carrots under different pulsed electric field conditions (field strengths of 250, 750, and 1,250 V/cm, pulse numbers of 10, 45, and 80, and pulse frequency of 1 Hz) and simultaneous thermal treatments (at 20, 45, and 70°C) were studied based on full factorial design experiments with 27 runs. Carrot slices treated with PEF were suspended in water at the desired temperature and liquid‐to‐solid weight ratio of L/S = 2. Immediately after the PEF treatment, a significant increase in solute extraction was observed due to the permeability of cell membrane that could lead to the enhancement of solute convection on the surface of the tissue. Optimum extraction parameters were obtained as follows: PEF with the field intensity of 750 V/cm, 10 pulses, and temperature of 45°C.
Highlights
Sugars exist in most of the plant tissues, but only sugar beet and sugar cane are significant sources of sugar for optimal extraction in the industry
This work aims to apply full factorial design (FFD) methodology to study the simultaneous effect of PEF parameters and temperature on sugar extraction yield and the disintegration index of carrot slices to obtain the optimal conditions of PEF and thermal treatments
The method of pulsed electric field was utilized for sugar extraction from carrot
Summary
Sugars exist in most of the plant tissues, but only sugar beet and sugar cane are significant sources of sugar for optimal extraction in the industry. The complete extraction of intracellular components in a solid–liquid extraction process involves the denaturation of cell membranes in the solid phase. In this way, sugar is extracted by countercurrent water at the high temperature of liquid phase within 70–74°C during the extracting times of 1–1.5 hr, which leads to the disintegration of cell membranes. Sugar is extracted by countercurrent water at the high temperature of liquid phase within 70–74°C during the extracting times of 1–1.5 hr, which leads to the disintegration of cell membranes The disadvantage of these processes is the decomposition of the inner chemical structure of cell walls by hydrolytic reactions. To enhance the overall yield and selectivity of components from plant materials, ultrasound (Karki et al, 2010; Mason, Paniwnyk, & Lorimer, 1996), pulsed electric
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