Sulfated xylomannans isolated from red seaweeds Chondrophycus papillosus and C. flagelliferus (Ceramiales) from Brazil

摘要

Sulfated xylomannans were isolated from two species of genus Chondrophycus by aqueous extraction followed by KCl fractionation. Structural determination of the native, desulfated and Smith-degraded KCl-precipitated polysaccharides carried out by composition and methylation analysis and NMR spectroscopy (1D and 2D experiments) showed the following general structure: beta-D-Xylp 1->6 beta-D-Manp-2-S 1->6 ->4)-beta-D-Manp-2-S-(1->4)-beta-D-Manp-2-S-(1->4)-beta-D-Manp-2-S-(1->4)-beta-D-Manp-2-S-(1->4)-beta-D-Manp-2-S-(1-> These xylomannans present different degrees of branching (15-25%) by beta-D-Xylp (70-80%) and beta-D-Manp-2-S (20-30%) and molecular weights (33-222 kDa). This is the first report of the presence of a sulfated xylomannan in species of order Ceramiales.