Recovery of dietary fiber and polyphenol from grape juice pomace and evaluation of their functional properties and polyphenol compositions

Abstract

The present work aimed at the recovery and characterization of dietary fiber and polyphenolic compounds extracted from red grape pomace, a by-product generated after grape fruit processing. High contents of total DF were found in the dietary fiber extracts (57.24%), whereas insoluble fiber was the major fraction (51.70%). And it showed good functional properties, including swelling capacity (4.01-8.32 mL g), water holding capacity (1.91-4.23 g g) and oil holding capacity (0.59-0.65 g g). After separation from the dietary fiber, phenolic extracts with high concentrations of total phenolic compounds and total flavonoids, showed high antioxidant activities, while the separated dietary fiber showed little antioxidant activities. This indicated that the phenolic composition is essential for the antioxidant activity of "antioxidant dietary fiber (ADF)". The identification of individual polyphenols was performed applying the HPLC-ESI-MS/MS technique and 31 compounds have been identified belonging to 4 groups, including anthocyanins, flavonols, flavan-3-ols and phenolic acids. Based on this study, we believe grape juice pomace could potentially be exploited as an inexpensive source of natural dietary fiber and phenolics and possibly used as a functional food ingredient.

Fate of Residual Pesticides in Fruit and Vegetable Waste (FVW) Processing

“…Acetone was evaporated at 60 °C under vacuum. Phenolic compounds were purified with butanone by solvent fractionation process and then freeze-dried again, while dietary fiber concentrate was treated by freeze-drying of the extracted solid residue [ 97 ]. In another study, the antioxidant extraction process from grape stalk, in order to quantify the influence of the previous drying operation on extraction kinetics, was evaluated by Garcia-Perez, et al (2010) [ 98 ].…”

Recovery of Oligomeric Proanthocyanidins and Other Phenolic Compounds with Established Bioactivity from Grape Seed By-Products

“…Grape-derived products industry, such as winery and juices industries, generates high amounts of pomaces that include pulp residues, stems, skins and seeds. It has been estimated that the grape pomace amounts are approximately 20% ( w / w ) of wine or juice industry [1]. Grape pomace represents an environmental problem; however, it contains large amounts of phytochemicals (phenolic compounds among others), because of that it could be considered a low-cost source of these bioactive compounds [2].…”

Influence of low molecular weight compounds associated to cashew ( Anacardium occidentale L.) fiber on lipid metabolism, glycemia and insulinemia of normal mice

“…Water absorption capacity is an important property both from the physiological and technological point of view, since it can increase the volume of food and modify the viscosity and texture of a formulated product. From the physiological point of view, water absorption capacity is an important property for weight loss and digestive health (Zhang et al, 2017).…”

“…Compared with the dietary fiber of cereals, fruit fiber is reported to have a better quality due to its higher content of total and soluble fibers, water and oil retention capacity and colon fermentability, as well as its lower levels of phytic acid and caloric value (Zhang et al, 2017). In addition, fruit fiber has significant amounts of secondary compounds associated with it, such as polyphenols and other bioactive compounds (Martín-Carrón, Goñi, Larrauri, García-Alonso, & Saura-Calixto, 1999).…”