Grape Pomace as a Potential Food Fiber

Abstract

Grape pomace, and insoluble and soluble dietary fiber (DF) fractions, obtained by enzymatic-gravimetric methods, were analyzed for neutral sugars, uranic acids, Klason lignin and amino acids. DF constituted 80% of dry matter, IDF was the major fraction. The main neutral sugar constituent of IDF was glucose. The major part was cellulose and the remainder, along with xylose, was a xyloglucan, which also contained fucose. Uranic acids accounted for 64% of SDF and a high amount of arabinose, galactose and mamtose were also included in that fraction. Proteins were not well solubilized by the assay enzymes. During the isolation of DF fractions a considerable solubilization of polyphenols was observed. These compounds were associated with Klason lignin in the starting material. Composition of DF fractions enables grape pomace to be considered a useful fiber-rich food ingredient.

Chemical composition and bioactive compounds of grape pomace (Vitis vinifera L.), Benitaka variety, grown in the semiarid region of Northeast Brazil

“…Higher values (11g/100g, 12g/100g, and 14g/100g) were found by Valiente et al (1995), Llobera & Cañellas (2007) and Bravo & Saura-Calixto (1998) in grape residues.…”

Novel vinegar-derived product enriched with dietary fiber: effect on polyphenolic profile, volatile composition and sensory analysis

“…Other autors have studied the fiber in apple, (Figuerola et al 2005) and in concentrates of mango, peach, orange and date GrigelmoMiguel and Martıń-Belloso 1999;Elleuch et al 2008;Vergara-Valencia et al 2007). In grapes and wines, only few researches have been found, (Bravo and Saura-Calixto 1998;Deng et al 2011;Valiente et al 1995) and dietary fiber in several Spanish and American grape varieties was analyzed. Also other authors monitored the dietary fiber of Cencibel skins and red wines from different locations of Spain (Saura-Calixto 1998;Saura-Calixto and Díaz-Rubio 2007), and in wine grape pomace (Zhu et al 2014).…”

Anaerobic 4-hydroxyproline utilization: Discovery of a new glycyl radical enzyme in the human gut microbiome uncovers a widespread microbial metabolic activity

“…For example, Hyp makes up over 4% of the protein content in dietary fibers extracted from grape pomace. 40 Arabinogalactan proteins, a class of HRGPs, are also a major component in gum arabic, which is used as a thickening and stabilizing agent in the food industry and is found in products like candies, gum, and beverages. 41 In addition to dietary sources, it is estimated that endogenous collagen turnover in humans releases ∼300 mg of Hyp daily.…”