scholarly journals Analyse par chromatographie en phase gazeuse de l'urethane dans les vins (1)

OENO One ◽  
1975 ◽  
Vol 9 (3) ◽  
pp. 187
Author(s):  
G. Walker ◽  
W. Winterlin ◽  
H. Fouda ◽  
J. Seiber
Keyword(s):  
American Chemical Society ◽  
Chemical Society ◽  
Phase Gazeuse ◽  
Food Chemistry

<p style="text-align: justify;">Le but du présent travail est le suivant : mettre au point une méthode de détection des faibles teneurs en uréthane pour les analyses en série et étudier quantitativement la formation d'uréthane dans diverses conditions (OUGH, 1974).</p><p style="text-align: justify;"><br />(1) Traduit et publié avec l'autorisation de Journal of Agricultural and Food Chemistry, 22, 944 (1974). Copyright by American Chemical Society.</p>

Polysaccharide Structures in the Outer Mucilage of Arabidopsis Seeds Visualized by AFM

2020 ◽  
Author(s):  
MAK Williams ◽  
V Cornuault ◽  
AH Irani ◽  
VV Symonds ◽  
J Malmström ◽  
...  
Keyword(s):  
Average Length ◽  
American Chemical Society ◽  
Md Simulations ◽  
Chemical Society ◽  
Side Chains ◽  
Rhamnogalacturonan I ◽  
Afm Imaging ◽  
Minor Population ◽  
The Stability ◽  
A Minor

© 2020 American Chemical Society. Evidence is presented that the polysaccharide rhamnogalacturonan I (RGI) can be biosynthesized in remarkably organized branched configurations and surprisingly long versions and can self-assemble into a plethora of structures. AFM imaging has been applied to study the outer mucilage obtained from wild-type (WT) and mutant (bxl1-3 and cesa5-1) Arabidopsis thaliana seeds. For WT mucilage, ordered, multichain structures of the polysaccharide RGI were observed, with a helical twist visible in favorable circumstances. Molecular dynamics (MD) simulations demonstrated the stability of several possible multichain complexes and the possibility of twisted fibril formation. For bxl1-3 seeds, the imaged polymers clearly showed the presence of side chains. These were surprisingly regular and well organized with an average length of ∼100 nm and a spacing of ∼50 nm. The heights of the side chains imaged were suggestive of single polysaccharide chains, while the backbone was on average 4 times this height and showed regular height variations along its length consistent with models of multichain fibrils examined in MD. Finally, in mucilage extracts from cesa5-1 seeds, a minor population of chains in excess of 30 μm long was observed.

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