Molar Mass Determination of Water-Soluble Light-Emitting Conjugated Polymers by Fluorescence-Based Analytical Ultracentrifugation

2009 ◽  
Vol 42 (7) ◽  
pp. 2737-2740 ◽  
Author(s):  
Xiao-Tao Hao ◽  
Tim Ryan ◽  
Michael F. Bailey ◽  
Trevor A. Smith
Keyword(s):  
Conjugated Polymers ◽  
Molar Mass ◽  
Analytical Ultracentrifugation ◽  
Water Soluble ◽  
Mass Determination ◽  
Light Emitting

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.

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

Efficient Separation of Conjugated Polymers Using a Water Soluble Glycoprotein Matrix: From Fluorescence Materials to Light Emitting Devices

2013 ◽  
Vol 14 (3) ◽  
pp. 320-326 ◽  
Author(s):  
Netta Hendler ◽  
Jurjen Wildeman ◽  
Elad. D. Mentovich ◽  
Tobias Schnitzler ◽  
Bogdan Belgorodsky ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Water Soluble ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Efficient Separation

Hydrolytic stability of water-soluble spruce O-acetyl galactoglucomannans

Holzforschung ◽  
2009 ◽  
Vol 63 (1) ◽  
Author(s):  
Chunlin Xu ◽  
Andrey Pranovich ◽  
Jarl Hemming ◽  
Bjarne Holmbom ◽  
Simone Albrecht ◽  
...  
Keyword(s):  
Food Processing ◽  
Molar Mass ◽  
Hydrolytic Stability ◽  
Water Soluble ◽  
Average Molar Mass ◽  
Acidic Conditions ◽  
The Stability ◽  
Stability Of Water ◽  
Hydrolysis Of

Abstract Water-soluble native O-acetyl galactoglucomannan (GGM) from spruce is a polysaccharide that can be produced in an industrial scale. To develop GGM applications, information is needed on its stability, particularly under acidic conditions. Therefore, acid hydrolysis of spruce GGM was investigated at various pH levels and temperatures. The results allow an estimation of the stability of GGM under food processing conditions and in biological systems. Determination of the average molar mass demonstrated that spruce GGM was stable at pH 1 and 37°C, as well as at pH 3 and 70°C. GGM was hydrolysed at pH 1 and 90°C. GGM oligomers and monomers were detected after degradation. Some of the oligomers contained O-acetyl groups. Monosaccharides were the predominant products in the hydrolysates after treatment at pH 1 and 90°C for 48 h. Pentoses, present in GGM samples as impurities, were released more easily than GGM hexoses. Glucose was more difficult to release than mannose. Traces of 6-deoxy-mannose and levoglucosan were found in the hydrolysates, indicating further degradation of hydrolysed monosaccharides.

scholarly journals Overview of Methods for the Direct Molar Mass Determination of Cellulose

Molecules ◽  
2015 ◽  
Vol 20 (6) ◽  
pp. 10313-10341 ◽  
Author(s):  
Josua Oberlerchner ◽  
Thomas Rosenau ◽  
Antje Potthast
Keyword(s):  
Molar Mass ◽  
Mass Determination
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