کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1385042 | 982428 | 2008 | 7 صفحه PDF | دانلود رایگان |

Water soluble polysaccharide from Gracilaria birdiae cultivated along the northeast coast of Brazil was characterized by infrared (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. The composition of the polysaccharide in wt% was determined as: β-d-galp (50.3%), 3,6-anhydro-α-l-galp (40.5%) and -α-l-galp-6 sulfate (9.2%). The ratio of l/d units (β-d-galp units and 3,6-anhydro-α-l-galp + α-l-galp-6 sulfate) is that of an ideal agarose. The sulfate content calculated by S% accounts for 6.4%. 1D and 2D NMR techniques were employed in order to assign the spin system of polysaccharide without partial degradation. The structure is composed of → 4-3,6-anhydro-α-l-galp (1 → 3)β-d-galp 1 → segments, with the possibility of a α-l-galp unit substituted at the 6-position by sulfate ester.
Journal: Carbohydrate Polymers - Volume 71, Issue 4, 7 March 2008, Pages 559–565