کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1390509 | 983093 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: β-d-(1→4), β-d-(1→3) ‘mixed linkage’ xylans from red seaweeds of the order Nemaliales and Palmariales β-d-(1→4), β-d-(1→3) ‘mixed linkage’ xylans from red seaweeds of the order Nemaliales and Palmariales](/preview/png/1390509.png)
Xylans from five seaweeds belonging to the order Nemaliales (Galaxaura marginata, Galaxaura obtusata, Tricleocarpacylindrica, Tricleocarpa fragilis, and Scinaia halliae) and one of the order Palmariales (Palmaria palmata) collected on the Brazilian coasts were extracted with hot water and purified from acid xylomannans and/or xylogalactans through Cetavlon precipitation of the acid polysaccharides. The β-d-(1→4), β-d-(1→3) ‘mixed linkage’ structures were determined using methylation analysis and 1D and 2D NMR spectroscopy. The presence of large sequences of β-(1→4)-linked units suggests transient aggregates of ribbon- or helical-ordered structures that would explain the low optical rotations.
The β-d-(1→4), β-d-(1→3) ‘mixed linkage’ structures of xylans from five seaweeds belonging to the order Nemaliales and one of the order Palmariales were determined using methylation analysis, and 1D and 2D NMR spectroscopy.
Journal: Carbohydrate Research - Volume 346, Issue 8, 1 June 2011, Pages 1023–1028