Bleaching of sodium alginate from the brown seaweeds Sargassum with hydrogen peroxide

Quimica nova

Torres, Mabel¹  Regalado, Erik L.²  Laguna, Abilio²  Sabatier, Juan D.³  Hernández, Margarita⁴  Ferrer, Anselmo E.⁴  Nogueiras, Clara⁴ 

[1] Farmácia de Manipulação Valfarma, Porto Velho, Brasil;Ministerio de Ciencia Tecnología y Medio Ambiente, Ciudad Habana, Cuba;Universidad Nacional Mayor de San Marcos, Lima, Peru;Universidad de La Habana, Ciudad de La Habana, Cuba

关键词: bleaching;    sodium alginate;    Sargassum.;   

DOI  :  10.1590/S0100-40422007000100002

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Hydrogen peroxidebleaching of sodium alginate from seaweeds oh the Sargassum genus wasstudied. The influence of H2O2 concentration (percentageof H2O2 on a dry weight alginate basis, w/w) and NaOH/H2O2ratio (% NaOH/% H2O2, both referred to a dry weight alginatebasis, w/w) on the molecular weight, color removal and content of Fe3+ions of bleached alginate samples was investigated by UV and IR spectroscopies,colorimetric determination of Fe3+ ions and vapor pressure osmometry.Higher yield, purity and molecular weight of alginate were obtained using 3%(or less) of hydrogen peroxide and a NaOH/H2O2 ratio of1.2 for bleaching.

【 授权许可】

CC BY