title: DECREASE IN DYNAMIC VISCOSITY AND AVERAGE MOLECULAR WEIGHT OF ALGINATE FROM LAMINARIA DIGITATA DURING ALKALINE EXTRACTION(1).
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.
authors.affiliation: UMR 6144 CNRS Génie des Procédés Environnement Agroalimentaire, CRTT, BP406, 37 bd de l'Université, 44602 Saint-Nazaire Cedex, FranceIFREMER, Laboratoire Physiologie et Biotechnologie des Algues, rue de l'Ile d'Yeu, BP21105, 44311 Nantes Cedex 03, FranceIFREMER, Département Sciences et Techniques Alimentaires Marines, rue de l'Ile d'Yeu, BP21105, 44311 Nantes Cedex 03, France.
authors.forename: Peggy
authors.initials: P
authors.lastname: Vauchel
authors.affiliation: UMR 6144 CNRS Génie des Procédés Environnement Agroalimentaire, CRTT, BP406, 37 bd de l'Université, 44602 Saint-Nazaire Cedex, FranceIFREMER, Laboratoire Physiologie et Biotechnologie des Algues, rue de l'Ile d'Yeu, BP21105, 44311 Nantes Cedex 03, FranceIFREMER, Département Sciences et Techniques Alimentaires Marines, rue de l'Ile d'Yeu, BP21105, 44311 Nantes Cedex 03, France.
authors.forename: Abdellah
authors.initials: A
authors.lastname: Arhaliass
authors.affiliation: UMR 6144 CNRS Génie des Procédés Environnement Agroalimentaire, CRTT, BP406, 37 bd de l'Université, 44602 Saint-Nazaire Cedex, FranceIFREMER, Laboratoire Physiologie et Biotechnologie des Algues, rue de l'Ile d'Yeu, BP21105, 44311 Nantes Cedex 03, FranceIFREMER, Département Sciences et Techniques Alimentaires Marines, rue de l'Ile d'Yeu, BP21105, 44311 Nantes Cedex 03, France.
authors.forename: Jack
authors.initials: J
authors.lastname: Legrand
authors.affiliation: UMR 6144 CNRS Génie des Procédés Environnement Agroalimentaire, CRTT, BP406, 37 bd de l'Université, 44602 Saint-Nazaire Cedex, FranceIFREMER, Laboratoire Physiologie et Biotechnologie des Algues, rue de l'Ile d'Yeu, BP21105, 44311 Nantes Cedex 03, FranceIFREMER, Département Sciences et Techniques Alimentaires Marines, rue de l'Ile d'Yeu, BP21105, 44311 Nantes Cedex 03, France.
authors.forename: Raymond
authors.initials: R
authors.lastname: Kaas
authors.affiliation: UMR 6144 CNRS Génie des Procédés Environnement Agroalimentaire, CRTT, BP406, 37 bd de l'Université, 44602 Saint-Nazaire Cedex, FranceIFREMER, Laboratoire Physiologie et Biotechnologie des Algues, rue de l'Ile d'Yeu, BP21105, 44311 Nantes Cedex 03, FranceIFREMER, Département Sciences et Techniques Alimentaires Marines, rue de l'Ile d'Yeu, BP21105, 44311 Nantes Cedex 03, France.
authors.forename: Régis
authors.initials: R
authors.lastname: Baron
keywords: Laminaria digitata; alginate; alkaline extraction; average molecular weight; depolymerization; intrinsic viscosity