Quantitative mass determination of conjugated polymers for single molecule conformation analysis: enhancing rigidity with macrocycles

2010 ◽  
Vol 46 (26) ◽  
pp. 4686 ◽  
Author(s):  
Klaus Becker ◽  
Gerald Gaefke ◽  
Jasmin Rolffs ◽  
Sigurd Höger ◽  
John M. Lupton
Keyword(s):  
Conjugated Polymers ◽  
Single Molecule ◽  
Mass Determination ◽  
Conformation Analysis ◽  
Molecule Conformation

scholarly journals Molar mass determination of lignins and characterization of their polymeric structures by multi-detector gel permeation chromatography

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Evamaria C. Gaugler ◽  
Wolfgang Radke ◽  
Andrew P. Vogt ◽  
Dawn A. Smith
Keyword(s):  
Molar Mass ◽  
Lithium Bromide ◽  
Gel Permeation Chromatography ◽  
Mass Determination ◽  
Organosolv Lignin ◽  
Gel Permeation ◽  
Softwood Kraft Lignin ◽  
Polymeric Structures

AbstractMolar masses, Mark-Houwink-Sakurada (MHS) exponents, and refractive index increments (dn/dc) for three lignins were determined without derivatization by multi-detector gel permeation chromatography (GPC) in dimethylformamide (DMF) with 0.05 M lithium bromide (LiBr). The lack of effectiveness of fluorescence filters on molar mass determination by GPC-multi-angle laser light scattering (MALS) was confirmed for softwood kraft lignin (Indulin AT) and revealed for mixed hardwood organosolv lignin (Alcell) as well as soda straw/grass lignin (Protobind 1000). GPC with viscometry detection confirmed that these lignins were present as compact molecules. The MHS exponent α for Indulin AT and Alcell was in the order of 0.1. Additionally, the intrinsic viscosity of Protobind 1000 for a given molar mass was much lower than that of either Alcell or Indulin AT. This is the first report of dn/dc values for these three lignins in DMF with 0.05 M LiBr.

Determination of the size of lipid rafts studied through single-molecule FRET simulations

2021 ◽  
Author(s):  
Pablo Luis Hernández-Adame ◽  
Ulises Meza ◽  
Aldo A. Rodríguez-Menchaca ◽  
Sergio Sánchez-Armass ◽  
Jaime Ruiz-García ◽  
...  
Keyword(s):  
Lipid Rafts ◽  
Single Molecule ◽  
Single Molecule Fret
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