Granulometric fractionation and micronization: A process for increasing soluble dietary fiber content and improving technological and functional properties of olive pomace. (August 2020)

• Record Type: Journal Article
• Authors: Speroni, Caroline Sefrin; Bender, Ana Betine Beutinger; Stiebe, Jessica; Ballus, Cristiano Augusto; Ávila, Patrícia Felix; Goldbeck, Rosana; Morisso, Fernando Dal Pont; Silva, Leila Picolli da; Emanuelli, Tatiana
• Is Part Of: Lebensmittel-Wissenschaft + Technologie =. Volume 130(2020)
• Publication Date: 2020-08
• Subjects: Olive oil -- Agro-industrial waste -- Ball milling -- Dietary fiber -- Arbequina; Food industry and trade -- Periodicals; Food -- Composition -- Periodicals; Microbiology -- Periodicals; Nutrition -- Periodicals; 664.005
• DOI: 10.1016/j.lwt.2020.109526
• Languages: English
• ISSNs: 0023-6438

Abstract

Abstract: The aim of this study was to evaluate the effect of micronization of granulometrically separated olive pomace fractions on dietary fiber composition, technological and functional properties. OP was separated in a 2-mm sieve, resulting in: F1 (>2 mm) and F2 (<2 mm). F2 had higher content of soluble dietary fiber than F1 and lower lignin content. F2 had higher water and oil holding capacities, solubility and cation exchange capacity than F1. The micronization of F1 and F2 fractions using a ball milling (300 r min −1 /5 h) reduced the average particle size by 20 times yielding F1AG (17.8 μm) and F2AG (15.6 μm). Micronization caused a redistribution of fiber fractions (from insoluble to soluble), decreased lignin content and changed granule morphology. FT-IR spectra showed that micronization exposed some functional groups, which explains the changes in dietary fiber composition. Thus, micronization converts OP into novel powders bearing improved technological and functional properties. Highlights: Granulometric separation of OP fractions produces two novel powders with different compositions. Micronization increases soluble dietary fiber content of OP fractions. Micronization reduces lignin content of OP fractions. Micronization improves physicochemical properties of OP fractions.