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Structural and Rheological Properties of Pectins Extracted from Industrial Sugar Beet By-Products

By M. Teresa Pacheco, Mar Villamiel, Rodrigo Moreno and F. Javier Moreno

Abstract

In this work, the efficient extraction of pectin from sugar beet by-products (pressed, ensiled and dried pulp), by using an acid method or a commercial cellulose, is accomplished. The extraction method had an impact on the pectin monomeric composition, mainly in xylose, arabinose, and galacturonic acid content, as determined by GC-FID. FTIR and SEC analyses allowed the determination of similar degrees of methoxylation and molecular weights, respectively, in the extracted pectins. The acid extraction of pectin in the ensiled by-product led to the highest yield (19%) with a galacturonic acid content of 46%, whereas the application of the enzymatic extraction method resulted in a lower yield (13%) but higher galacturonic acid content (72%). Moreover, the stability in aqueous solution as well as the emulsifying activity index was higher for pectin extracted by the acid method, whereas the viscosity was higher in pectin extracted by the enzymatic method. To the best of our knowledge, this is the first study analyzing the physicochemical properties and exploring the potential reuse of ensiled and dried by-products from sugar beet industry for the extraction of pectin to be further used in the food and pharmaceutical areas

Topics: sugar beet, by-products, silage, pectin, viscosity, emulsifying activity, Organic chemistry, QD241-441
Publisher: MDPI AG
Year: 2019
DOI identifier: 10.3390/molecules24030392
OAI identifier: oai:doaj.org/article:22b6c7519e134a4bb63341276fa60677
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