Direct Molar Mass Determination of Self-Assembled Amphiphilic Block Copolymer Nanoobjects Using Electrospray-Charge Detection Mass Spectrometry

2012 ◽  
Vol 1 (3) ◽  
pp. 414-417 ◽  
Author(s):  
Tristan Doussineau ◽  
Cong Yu Bao ◽  
Rodolphe Antoine ◽  
Philippe Dugourd ◽  
Wenjing Zhang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Block Copolymer ◽  
Molar Mass ◽  
Amphiphilic Block Copolymer ◽  
Mass Determination ◽  
Charge Detection Mass Spectrometry ◽  
Charge Detection ◽  
Self Assembled

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.

Heterogeneity of Glycan Processing on Trimeric SARS-CoV-2 Spike Protein Revealed by Charge Detection Mass Spectrometry

2021 ◽  
Vol 143 (10) ◽  
pp. 3959-3966 ◽  
Author(s):  
Lohra M. Miller ◽  
Lauren F. Barnes ◽  
Shannon A. Raab ◽  
Benjamin E. Draper ◽  
Tarick J. El-Baba ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Spike Protein ◽  
Charge Detection Mass Spectrometry ◽  
Charge Detection
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