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DECREASE IN DYNAMIC VISCOSITY AND AVERAGE MOLECULAR WEIGHT OF ALGINATE FROM LAMINARIA DIGITATA DURING ALKALINE EXTRACTION 1
Author(s) -
Vauchel Peggy,
Arhaliass Abdellah,
Legrand Jack,
Kaas Raymond,
Baron Régis
Publication year - 2008
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.2008.00482.x
Subject(s) - depolymerization , extraction (chemistry) , polysaccharide , intrinsic viscosity , viscosity , molecular mass , chromatography , rheology , biology , fucoidan , alkaline hydrolysis , materials science , biochemistry , chemistry , polymer , hydrolysis , organic chemistry , polymer chemistry , composite material , enzyme
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.