A alga marrom Dictyopteris justii sintetiza quatro frações ricas em polissacarídeos sulfatados DJ-0.3v, DJ-0.4v, DJ-0.5v e DJ1.2v.
A análise da composição monossacarídica dessa alga indicou que essa alga sintetiza um complexo sistema de polissacarídeos sulfatados. Na fração DJ- 0.3v, glucofucoxyloglucuronana; na fração DJ-0.4v, uma hetrofucana; e nas frações DJ-0.5v e DJ-1.2v uma glucana sulfatada.
Todas as frações apresentaram atividade antioxidante, com destaque para a fração DJ-0.4v, que foi a mais potente em todos os ensaios, principalmente em CAT, poder redutor e Quelação de Cobre; Como também foi a que teve melhor capacidade de inibir a cristalização de oxalato de cálcio.
Destaca-se também a fração DJ-0.5v, que além de inibir também foi capaz de estabilizar os cristais COD, impedindo-os de se transformarem em cristais COM. Estes polissacarídeos são, portanto, agentes promissores para a possível utilização para tratamento da urolitíase.
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