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DECREASE IN DYNAMIC VISCOSITY AND AVERAGE MOLECULAR WEIGHT OF ALGINATE FROM LAMINARIA DIGITATA DURING ALKALINE

Peggy Vauchel¹, Abdellah Arhaliass¹, Jack Legrand¹

¹UMR 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.

Journal of Phycology

|April 5, 2016

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Alkaline treatment of brown seaweed alginates for several hours significantly reduces their molecular weight and viscosity. Shortening extraction times can help preserve alginate properties for industrial applications.

Area of Science:

Biopolymer extraction and characterization
Marine natural products chemistry
Materials science of polysaccharides

Background:

Alginates, natural polysaccharides from brown seaweeds, are valued for their rheological properties.
Alkaline extraction is a key industrial process for obtaining alginates, but it is time-consuming.
The impact of prolonged alkaline treatment on alginate molecular integrity is not fully understood.

Purpose of the Study:

To investigate the effect of alkaline extraction duration on the molecular weight and viscosity of alginates.
To determine the extent of alginate depolymerization during alkaline extraction.
To provide insights for optimizing alginate extraction protocols.

Main Methods:

Alkaline extraction of alginates from brown seaweed at varying durations (1-4 hours).

Keywords:

Laminaria digitata alginate alkaline extraction average molecular weight depolymerization intrinsic viscosity

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Measurement of alginate dynamic viscosity.

Determination of intrinsic viscosity and average molecular weight using viscometry techniques.

Main Results:

A significant decrease in alginate dynamic viscosity was observed after 2 hours of alkaline treatment.
Average molecular weight of alginates decreased significantly with increasing extraction time.
Molecular weight fell by a factor of 5 between 1 and 4 hours of alkaline extraction, indicating depolymerization.

Conclusions:

Prolonged alkaline extraction leads to alginate depolymerization, negatively impacting rheological properties.
Reducing alkaline treatment time is crucial for preserving the intrinsic quality and functionality of extracted alginates.
Optimized extraction times can enhance the suitability of alginates for industrial applications requiring specific rheological characteristics.