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The size or hydrodynamic radius RH can be determined in two ways. The first method is by Dynamic Light Scattering (DLS), which is generally used as a batch technique to measure the average size in the whole sample, but can be used as a detector for Size Exclusion Chromatography (GPC/SEC).

A very accurate and precise method of obtaining RH of all components in a sample is by triple detection after separation by SEC.

By the use of online light scattering and viscometer detectors, the MW and intrinsic viscosity of the polymer or protein can be determined and hence the RH calculated at any point on the chromatogram.

The benefit of both these techniques is that there is no practical upper or lower size limit for the materials being investigated.

The measurement of molecular size is a useful parameter for a number of applications:

  • Comparison with molecular weight gives information about structure
  • DLS can use molecular size to give a quick estimate of molecular weight
  • DLS can give a fast screen of protein purity
  • Determination of protein melting point.

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GPC Characterization of Nylon using Formic Acid for Reduced Cost per Analysis Application Note (English)

GPC/SEC can be used to characterize commodity or bulk manufactured polymers. Here we describe how the use of formic acid instead of HFIP as the dissolution solvent and/or mobile phase can lead to improvements in both cost per analysis and health and ...


Keywords: Polymer solutions English Method development Application Note Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Bulk (commodity) polymers Viscotek 270max Viscotek TDAmax Viscotek TDA 305 

Exploring the role of SEC-MALS in protein and polymer characterization Webinar - Recorded (English)

Size exclusion chromatography (SEC) is a chromatographic technique for the characterization of proteins and biopharmaceuticals, as well as natural and synthetic polymers. Traditional systems comprised a single concentration detector (Conventional Cal...

Product:
Viscotek SEC-MALS,Viscotek 270max,Viscotek TDAmax,Viscotek RImax
Date recorded:
October 17 2014
Language:
English

Keywords: Polymer solutions English Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Food additives Rubbers and elastomers Specialty and novel polymers Membrane proteins Polysaccharides Webinar - Recorded GMT Time Protein aggregation Proteins Bioformulation development Antibodies and derivatives Viscotek 270max Viscotek RImax Viscotek TDAmax Viscotek SEC-MALS 

Powerful protein SEC made simple! Webinar - Recorded (English)

This webinar discusses how Malvern’s protein SEC measurement capabilities within the Viscotek range have developed and improved in the last year. We also introduce the new features that are included in the latest release of OmniSEC, including: Bio...

Product:
Viscotek range,Viscotek RImax,Viscotek DSV,Viscotek 270max,Viscotek TDAmax,Viscotek SEC-MALS
Date recorded:
September 30 2014
Language:
English

Keywords: English Viscotek range Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Webinar - Recorded Eastern Time Protein aggregation Proteins Biopharmaceutical development Viscotek 270max Viscotek DSV Viscotek RImax Viscotek TDAmax Viscotek SEC-MALS 

Interfacing Viscotek detectors with Waters SEC systems and Waters Empower® software Technical Note (English)

This technical note describes how to connect Viscotek detectors to Waters systems, in particular the Waters Alliance® system, and how to use OmniSEC in combination with Empower® to run trouble-free separation sequences.


Keywords: English Technical Note Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Membrane proteins Protein aggregation Proteins Biopharmaceutical development Antibodies and derivatives Viscotek 270max Viscotek HT-GPC Viscotek RImax Viscotek TDAmax Viscotek detectors 

Measuring protein molecular weight using the Viscotek SEC-MALS 20 connected to a Waters Empower® SEC system Application Note (English)

In this application note, we show that Malvern’s OmniSEC software can now communicate with Waters Empower® for the seamless exchange of sample sequences. A selection of proteins was used to demonstrate the measurement of protein molecular weight, oli...


Keywords: English Application Note Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Membrane proteins Protein aggregation Proteins Biopharmaceutical development Antibodies and derivatives Viscotek 270max Viscotek HT-GPC Viscotek RImax Viscotek TDAmax Viscotek detectors 
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