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Static light scattering (SLS) is a technique to measure absolute molecular weight using the relationship between the intensity of light scattered by a molecule and its molecular weight and size, as described by the Rayleigh theory. In the simplest terms, Rayleigh theory says that larger molecules scatter more light than smaller molecules from a given light source and that the intensity of the scattered light is proportional to the molecule’s molecular weight.
There are two ways to measure absolute molecular weight by SLS:
Batch measurement with cuvette based instruments, such as the Zetasizer series, is an ensemble technique. Therefore the result calculated is the weight average molecular weight of the entire sample measured.
However, the most common way of measuring absolute molecular weight is to add an SLS detector e.g. Low Angle Light Scattering LALS, Right Angle Light Scattering RALS or Multi Angle Light Scattering MALS to a GPC/SEC system. By combining SLS with the separation technique you can calculate the absolute molecular weight at any point in the eluting chromatogram and determining the molecular weight of any population in a mixed sample becomes possible.
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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 ...
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...
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:
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.
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...
(Webinar - Recorded)
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