GOMEZ CESAR GERARDO
Congresos y reuniones científicas
Título:
Influence of Extraction-Purification Conditions on Final Properties of Sodium Alginates Obtained from Brown Algae (Macrocystis pyrifera)
Autor/es:
CESAR G. GOMEZ; MARÍA V. PEREZ; MARGUERITE RINAUDO; MARCELO VILLAR
Lugar:
Río de Janeiro- Brasil
Reunión:
Simposio; World Polymer Congress ? Macro 2006, 41st International Symposium on Macromolecules; 2006
Resumen:
Alginates production is based on a series of ionic exchange reactions. However, extraction conditions such as temperature (T), time (t), and pH affect the extraction yield as well as cations other than sodium retained by alginate. At the conditions studied, a maximum yield of 35 % was obtained. The extraction yield increased with a raise in both the time and extraction temperature. On the other hand, higher temperatures of extraction were necessary when the extraction pH was decreased. Semidiluted solutions of sodium alginates extracted at low pH shown viscosities higher than expected due, probably, to a higher content of polyvalent cations such as Ca2+ and Mg2+, among others
