Product category:
Viscometers and rheometers
News Release from: Viscotek Europe | Subject: SEC3
Edited by the Laboratorytalk Editorial
Team on 30 November 2005
Unlocking the secrets of complex
polysaccharides
Viscotek has produced a new applications report illustrating how its unique Triple detection-GPC (SEC3) system enables precise and comprehensive characterisation of even complex polysaccharides
In the report two samples identified as branched polysaccharides and one sample identified as a corresponding linear polysaccharide are analysed to determine molecular weight and to analyse branching by SEC3 The polysaccharide samples in the report were analysed using a Viscotek SEC3 system comprising low angle light scattering (Lals), refractive index and viscometry detectors working in concert
This article was originally published on Laboratorytalk on 10 Jan 2002 at 8.00am (UK)
Related stories
Rapid polymer analysis
The flow injection polymer analysis (Fipa) system from Viscotek Europe is designed to rapidly screen polymer samples for molecular weight, molecular size and intrinsic viscosity
The report shows that both light scattering and viscometry data is required to unlock molecular weight distribution, viscosity, molecular size and branching frequency data from the highly branched samples.
Low angle light scattering was used to calculate the molecular weights which is extremely important when studying large biomolecules such as polysaccharides where traditional light scattering instruments give large data errors.
Other extrapolation based light scattering techniques, such as those using multi angle detectors, cannot be used because the large molecule sizes result in large data fitting errors.
By comparison the Viscotek Lals detector measures scattered light at 7deg, close enough to zero that the measurement is direct with no need to extrapolate or calculate to get accurate molecular weight and structure data. Request a free brochure from Viscotek Europe ...
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