Optimization of alginate alkaline extraction technology from Sargassum latifolium and its potential antioxidant and emulsifying properties.

Mustafa A Fawzy, Mohamed Gomaa, Awatief F Hifney, Khayria M Abdel-Gawad

Journal: Carbohydrate polymers 2018;157():1903-1912

PMID: 27987910

Full Text on Elsevier Science View on PubMed

Abstract

Alginate was recovered from Sargassum latifolium biomass using different conditions of alkali treatment. Box-Behnken experimental design was evaluated to study the influence of alkali:alga ratio, temperature and time on alginate yield, and its molecular weight (MW) and mannuronic/guluronic acid ratio (M/G). The second-order polynomial equations were analyzed by appropriate statistical methods. Extraction temperature and time were the most important factors during alginate alkaline extraction. MW and M/G ratio played an important role in controlling the reducing power of alginate. Increasing pH of the alginate solutions enhanced its reducing capacity, while thermal treatment showed a negative effect. Additionally, alginate exhibited good emulsion stabilizing capacities with diverse hydrophobic compounds. Emulsifying activity was less sensitive to temperature, ionic strength and more stable at acidic pH.

Address: Botany and Microbiology Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt.; Botany and Microbiology Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt. Electronic address: [email protected].

DOI: 10.1016/j.carbpol.2016.11.077

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MeSH Terms: Alginates, Antioxidants, Emulsifying Agents, Glucuronic Acid, Hexuronic Acids, Sargassum