Sugar mix for alditol acetates

2006 ◽  
Vol 2006 (1) ◽  
pp. pdb.rec10519
Keyword(s):  
Alditol Acetates

Structural analysis of oligomeric fructans from excised leaves of Lolium temulentum

2020 ◽  
Author(s):  
Ian Sims ◽  
CJ Pollock ◽  
R Horgan
Keyword(s):  
Mass Spectrometry ◽  
Structural Analysis ◽  
Higher Plants ◽  
Water Soluble ◽  
Lolium Temulentum ◽  
Neutral Water ◽  
Alditol Acetates ◽  
Partially Methylated

Individual fructan tri-, tetra- and pentasaccharide isomers in neutral, water-soluble extracts from Lolium temulentum were purified and the linkages present in these isomeric oligosaccharides were analysed by combined GC-mass spectrometry of partially methylated alditol acetates. 1-Kestose and neokestose were the most abundant trisaccharides with 6-kestose present in much lower amounts. Analysis of isomers of DP 4 and 5 showed that multiple linkage types were present with structures based on all three trisaccharides. Oligosaccharides based on neokestose but with 2,6 linkages between adjacent fructose residues have not been previously detected in higher plants. © 1992.

G.l.c. of partially methylated alditol acetates

1978 ◽  
Vol 62 (2) ◽  
pp. 363-367 ◽  
Author(s):  
Haralambos Parolis ◽  
Donald McGarvie
Keyword(s):  
Alditol Acetates ◽  
Partially Methylated

Semimicro Determination of Sugar Configuration by Measurement of Circular Dichroism of Alditol Acetates

1973 ◽  
Vol 51 (2) ◽  
pp. 324-326 ◽  
Author(s):  
G. M. Bebault ◽  
J. M. Berry ◽  
Y. M. Choy ◽  
G. G. S. Dutton ◽  
N. Funnell ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Circular Dichroism ◽  
Structural Information ◽  
Acetoxy Group ◽  
Gas Liquid Chromatography ◽  
Circular Dichroïsm ◽  
Alditol Acetates

The configuration (D or L) of a sugar may be determined conveniently by circular dichroism measurements at 213 nm on alditol acetates, or their methylated derivatives, where the acetoxy group acts as a chromophore. Only milligram quantities of material are required and the method is well suited to analyzing fractions obtained by gas–liquid chromatography. Structural information which may be derived from the c.d. spectra is briefly discussed.

scholarly journals O-Methyl sugars in lipopolysaccharides of Rhodospirillacea. Identification of 3-O-methyl-d-mannose in Rhodopseudomonas viridis and of 4-O-methyl-d-xylose and 3-O-methyl-6-deoxy-d-talose in Rhodopseudomonas palustris respectively

1973 ◽  
Vol 135 (2) ◽  
pp. 293-297 ◽  
Author(s):  
Jürgen Weckesser ◽  
Hubert Mayer ◽  
Inge Fromme
Keyword(s):  
Mass Spectrometry ◽  
Paper Chromatography ◽  
High Voltage ◽  
Optical Rotation ◽  
Rhodopseudomonas Palustris ◽  
Rhodopseudomonas Viridis ◽  
Gram Negative ◽  
Optical Configuration ◽  
Alditol Acetates ◽  
High Voltage Electrophoresis

1. This paper deals with the identification of three O-methyl sugars in lipopolysaccharides isolated from strains of the Gram-negative photosynthetic family Rhodospirillaceae. In addition to the previously described 3-O-methyl-l-xylose, a second O-methyl sugar was encountered in the lipopolysaccharide of Rhodopseudomonas viridis F, namely 3-O-methyl-d-mannose. The lipopolysaccharides of two strains of Rhodopseudomonas palustris (strain 1e5 and 8/1) contain two O-methylsugars, 4-O-methyl-d-xylose and 3-O-methyl-6-deoxy-d-talose (d-acovenose). 4-O-Methyl-d-xylose, but not 3-O-methyl-6-deoxy-d-talose, could be identified in the lipopolysaccharides of the strains K/1 and 2/2 of the same species. 2. The O-methyl sugars described in this communication were isolated by paper chromatography and identified by g.l.c., paper chromatography, high-voltage electrophoresis and mass spectrometry. Besides the genuine sugars, their alditol acetates and their demethylated (parental) forms were investigated. Optical rotation measurements and, in one case, enzymic reactions were used to establish the optical configuration of the sugars under investigation.

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