Decrease in dynamic viscosity and average molecular weight of alginate from Laminaria digitata during alkaline extraction

Type Article
Date 2008-04
Language English
Author(s) Vauchel Peggy1, Arhaliass Abdellah1, Legrand Jack1, Kaas Raymond2, Baron RegisORCID3
Affiliation(s) 1 : CNRS, UMR Genie Procedes Environm Agroalimentaire 6144, CRTT, F-44602 St Nazaire, France.
2 : IFREMER, Lab Physiol & Biotechnol Algues, F-44311 Nantes, France.
3 : IFREMER, Dept Sci & Tech Alimentaires Marines, F-44311 Nantes, France.
Source Journal of Phycology (0022-3646) (Blackwell science), 2008-04 , Vol. 44 , N. 2 , P. 515-517
DOI 10.1111/j.1529-8817.2008.00482.x
WOS© Times Cited 22
Keyword(s) Laminaria digitata, Intrinsic viscosity, Depolymerization, Average molecular weight, Alkaline extraction, Alginate
Abstract Alginates are natural polysaccharides that are extracted from brown seaweeds and widely used for their rheological properties. The central step in the extraction protocol used in the alginate industry is the alkaline extraction, which requires several hours. In this study, a significant decrease in alginate dynamic viscosity was observed after 2 h of alkaline treatment. Intrinsic viscosity and average molecular weight of alginates from alkaline extractions 1-4 h in duration were determined, indicating depolymerization of alginates: average molecular weight decreased significantly during the extraction, falling by a factor of 5 between 1 and 4 h of extraction. These results suggested that reducing extraction time could enable preserving the rheological properties of the extracted alginates.
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