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

Química Nova

Regalado, Erik L.¹  Laguna, Abilio¹  Universidad de La Habana, Ciudad de La Habana, Cuba¹  Universidad Nacional Mayor de San Marcos, Lima, Peru¹  Hernández, Margarita¹  Torres, Mabel¹  Ministerio de Ciencia Tecnología y Medio Ambiente, Ciudad Habana, Cuba¹  Farmácia de Manipulação Valfarma, Porto Velho, Brasil¹  Ferrer, Anselmo E.¹  Nogueiras, Clara¹  Sabatier, Juan D.¹ 

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 peroxide bleaching of sodium alginate from seaweeds oh the Sargassum genus was studied. The influence of H2O2 concentration (percentage of H2O2 on a dry weight alginate basis, w/w) and NaOH/H2O2 ratio (% NaOH/% H2O2, both referred to a dry weight alginate basis, 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 of 1.2 for bleaching.

【 授权许可】

Unknown