The Pulsed Electric Field Assisted-Extraction Enhanced the Yield and the Physicochemical Properties of Soluble Dietary Fiber From Orange Peel

Abstract

The study aimed to investigate the effects of pulsed electric field (PEF)-assisted extraction on the yield, physicochemical properties, and structure of soluble dietary fiber (SDF) from orange peel. The results showed that the optinal parameters of PEF assisted extraction SDF was temperature of 45oC with the electric field intensity of 6.0 kV/cm, pulses number of 30, and time of 20min and SDF treated with PEF showed the higher water solubility, water-holding and oil-holding capacity, swelling capacity, emulsifying activity, emulsion stability, foam stability and higher binding capacity for Pb2+, As3+, Cu2+, and higher which resulted from the higher viscosity due to PEF treatment. Compared with the untreated orange peel, the SDF obtained with PEF exhibited stronger antioxidant activities, which was due to its smaller molecular weight (189 vs. 512 kDa). In addition, scanning electron micrograph images demonstrated that the surface of PEF-SDF was rough and collapsed. Overall, it was suggested that PEF treatment could improve the physicochemical properties of SDF from the orange peel and would be the potential extraction technology with high efficiency.

Characterization of the structural, physicochemical, and functional properties of soluble dietary fibers obtained from the peanut shell using different extraction methods

“…In contrast, a decreasing trend in LGC can be observed from 11.26 ± 0.71% (E-SDF) to 8.18 ± 0.28% (PEF-SDF; p < 0.05). The results showed that PEF-SDF has better gelation properties ( 32 ).…”

“…Water-related properties, including WHC and SC, have been reported to be associated with DF individual components, including molecular size and structure (network density and porosity) ( 46 ). It was speculated that the larger the WHC and SC values of PEF-SDF and M-SDF, the greater the proportion of short-chain dietary fiber ( 32 , 49 ). Similarly, the higher OHC values of PEF-SDF and M-SDF might be associated with more complex porous structures and surface areas, which is consistent with a previous report ( 50 ).…”

“…In nonthermal technology, PEF showed a mild modification for better physicochemical and functional properties due to the structural changes in SDF. SDF treated with PEF with a looser spatial structure had a higher specific surface area, which might improve the ability to adsorb or bind several molecules, including water, oil, and nitrite ions ( 60 , 61 ), which were approved for pulsed electric field-modified dietary fibers from orange peel ( 32 ). Another mild enzymatic modification shows unique advantages such as specificity and localization.…”

Pulsed electric field technology as a promising pre-treatment for enhancing orange agro-industrial waste biorefinery

“…PEF-assisted by the phenomenon of electropermeabilization reduces extraction time, diminishes the necessity for intense heating processes, and minimizes the reliance on solvents. 16,19,105 PEF-assisted extraction processes support the conceptions of green chemistry and sustainability. PEF technology by increasing the mass transfer of intracellular components allow the use of eco-friendly solvents for extracting natural colorants and bioactive compounds, preventing the contamination of food and beverages with harmful chemicals.…”

“…PEF-assisted by the phenomenon of electropermeabilization reduces extraction time, diminishes the necessity for intense heating processes, and minimizes the reliance on solvents. 16,19,105…”