scholarly journals The role of ceramide chain length distribution on the barrier properties of the skin lipid membranes

2014 ◽  
Vol 1838 (10) ◽  
pp. 2473-2483 ◽  
Author(s):  
E.H. Mojumdar ◽  
Z. Kariman ◽  
L. van Kerckhove ◽  
G.S. Gooris ◽  
J.A. Bouwstra
Keyword(s):  
Chain Length ◽  
Lipid Membranes ◽  
Length Distribution ◽  
Barrier Properties ◽  
Skin Lipid ◽  
Chain Length Distribution

Free fatty acids chain length distribution affects the permeability of skin lipid model membranes

2016 ◽  
Vol 1858 (9) ◽  
pp. 2050-2059 ◽  
Author(s):  
Masayuki Uchiyama ◽  
Masashi Oguri ◽  
Enamul H. Mojumdar ◽  
Gert S. Gooris ◽  
Joke A. Bouwstra
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Chain Length ◽  
Length Distribution ◽  
Model Membranes ◽  
Skin Lipid ◽  
Chain Length Distribution

On the role of the internal chain length distribution of amylopectins during retrogradation: Double helix lateral aggregation and slow digestibility

2020 ◽  
Vol 246 ◽  
pp. 116633 ◽  
Author(s):  
Laura Roman ◽  
Josephine Yee ◽  
Anna M.R. Hayes ◽  
Bruce R. Hamaker ◽  
Eric Bertoft ◽  
...  
Keyword(s):  
Chain Length ◽  
Double Helix ◽  
Length Distribution ◽  
Chain Length Distribution

THE DEGRADATION OF POLYSTYRENE: III. THE SCISSION OF POLYSTYLENE BY A VARIETY OF AGENTS AND THE ROLE PLAYED BY THE SOLVENT IN THIS PROCESS

1950 ◽  
Vol 28b (7) ◽  
pp. 429-440 ◽  
Author(s):  
D. S. Montgomery ◽  
C. A. Winkler
Keyword(s):  
Thermal Degradation ◽  
Linear Function ◽  
Benzoyl Peroxide ◽  
Chain Length ◽  
Intrinsic Viscosity ◽  
Structural Unit ◽  
Length Distribution ◽  
Relative Viscosity ◽  
Chain Length Distribution

For a number of polystyrenes possessing the Kuhn–Schulz chain length distribution but of different mean chain length, the relation was established between the intrinsic viscosity and the corresponding relative viscosity of a 16% solution in toluene, to facilitate the study of the scission process under conditions similar to those employed by Mesrobian and Tobolsky. It was found that this relation failed to distinguish between those scission points introduced during polymerization and those due to the subsequent degrading action of benzoyl peroxide and air. Assuming polystyrene prepared in a similar manner to that described by Mesrobian and Tobolsky possessed the Kuhn–Schulz chain length distribution it was possible to show that the average number of scission points per structural unit was a linear function of the mass of benzoyl peroxide added to the system and the number of hours exposure to light. The thermal degradation of polystyrene was studied both in the presence and the absence of toluene, and the role of the solvent in the scission of polystyrene by benzoyl peroxide and air was investigated.

Direct Observation of Chain Lengths and Conformations in Oligofluorene Distributions from Controlled Polymerization by Double Electron-Electron Resonance

2019 ◽  
Author(s):  
Dennis Bücker ◽  
Annika Sickinger ◽  
Julian D. Ruiz Perez ◽  
Manuel Oestringer ◽  
Stefan Mecking ◽  
...  
Keyword(s):  
Chain Length ◽  
Length Distribution ◽  
Catalyst System ◽  
Chain Conformation ◽  
Controlled Polymerization ◽  
Chain Length Distribution ◽  
Electron Resonance ◽  
Double Electron ◽  
The Individual ◽  
Double Electron Electron Resonance

Synthetic polymers are mixtures of different length chains, and their chain length and chain conformation is often experimentally characterized by ensemble averages. We demonstrate that Double-Electron-Electron-Resonance (DEER) spectroscopy can reveal the chain length distribution, and chain conformation and flexibility of the individual n-mers in oligo-(9,9-dioctylfluorene) from controlled Suzuki-Miyaura Coupling Polymerization (cSMCP). The required spin-labeled chain ends were introduced efficiently via a TEMPO-substituted initiator and chain terminating agent, respectively, with an in situ catalyst system. Individual precise chain length oligomers as reference materials were obtained by a stepwise approach. Chain length distribution, chain conformation and flexibility can also be accessed within poly(fluorene) nanoparticles.

scholarly journals Miniaturized Analysis of Amylopectin Chain Length Distribution by Fluorescence-Assisted Capillary Electrophoresis (FACE) down to Single Starch Granules

2021 ◽  
Author(s):  
amandine pruvost ◽  
stanislas helle ◽  
nicolas szydlowski ◽  
Christian ROLANDO
Keyword(s):  
Capillary Electrophoresis ◽  
Chain Length ◽  
Solid Phase ◽  
Potato Starch ◽  
Relative Proportion ◽  
Length Distribution ◽  
Fluorescence Analysis ◽  
Starch Granules ◽  
Chain Length Distribution ◽  
Single Granule

In the present work, we developed a miniaturized method for determining amylopectin chain length distribution (CLD) by fluorescence-assisted capillary electrophoresis (FACE). The method relies on single granule entrapping into capillaries followed by direct starch gelatinization and amylopectin debranching on carbograph-based solid phase extraction (SPE) cartridges. Sample desalting on HypersepTM tips following APTS-labelling and the use of nanovials allowed for the fluorescence analysis of weakly diluted samples. Consequently, method sensitivity was improved by 500-fold which is compatible with the analysis of single potato starch granules. The method was implemented to determine CLD profiles of single starch granules ranging from 50 to 100 µm in diameter. In these experiments, the relative proportion of starch glucans of up to 30 degrees of polymerization (DP) could be quantified.

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