Abstract
Alginates are natural polysaccharides that are extracted from brown seaweed varieties and it is widely used for their rheological properties. The main step in the extraction protocol of sodium alginate is alkaline extraction. Sodium alginate was produced by dipping the seaweed in 1% formaldehyde and 2.5% of sodium carbonate solution and properties were studied following the standard methods. The amount of sodium alginate yield was 31.7% in Sargassum wightii. The moisture content and the ash content were recorded at 16.82% and 5.20%, respectively. The viscosity and the gel strength were noted as 40 vcP, 4.54 × 10–2 kN with 0.1 M CaCl2 and 6.86 × 10–2 kN with 0.2 M CaCl2 respectively. This study of the extraction method and its properties reveal that Sargassum wightii brown seaweed species have a high affinity to extract the alginate.
Highlights
Brown algae (Phaeophyta) cell wall has a fibrillar section formed of cellulose micro fibrils, which is embedded with acid polysaccharides, linked to each other by protein [1]
Alginate is extracted from brown seaweed; by analytical method mainly focuses on the conversion of insoluble alginate present in the cell wall as magnesium and calcium alginate to a soluble form usually in sodium alginate [16]
We report on the extraction of alginates from brown algae species (Sargassum wightii) collected from the Southern coast of Sri Lanka
Summary
Brown algae (Phaeophyta) cell wall has a fibrillar section formed of cellulose micro fibrils, which is embedded with acid polysaccharides, linked to each other by protein [1]. The alginate content of brown seaweed varies depending upon the environmental conditions such as salinity, temperature, wave-current, species, the season of harvesting, and method of extraction used, etc. SA mixed with other polysaccharides or protein to make the edible films and it becomes the most simple and attractive strategy for improving the properties [13]. Alginate is extracted from brown seaweed; by analytical method mainly focuses on the conversion of insoluble alginate present in the cell wall as magnesium and calcium alginate to a soluble form usually in sodium alginate [16]. We report on the extraction of alginates from brown algae species (Sargassum wightii) collected from the Southern coast of Sri Lanka. We determine the optimum condition of the extraction method and evaluate their quality with commercially available alginate samples
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