January 28th 2021
GPC (Gel Permeation Chromatography), also known as SEC (Size-Exclusion-Chromatography), is widely acknowledged as the technique for determining the molecular weight distribution in polymer samples. However, GPC/SEC can be a time-consuming technique. As a consequence, accurate calculation of molecular weight using GPC/SEC is highly dependent on baseline stability. A new technical note investigates the importance of minimizing differential refractive index detector signal drift in a GPC/SEC system.
January 21st 2021
While a large proportion of GPC, HPLC and Ion Chromatography techniques are well served by standard detectors – a growing number of niche, emergent or challenging liquid chromatography applications are best served by a speciality detector optimised for the measurement.
A new brochure describes how TESTA Analytical has established itself as a trusted OEM partner for design, development and manufacture of specialist liquid chromatography detectors and modules to a growing number of analytical and process instrumentation companies worldwide.
January 14th 2021
Zeta potential is regarded as the most important characteristic to predict the stability of a dispersion of particles, i.e. whether particles stay dispersed or whether they aggregate and/or agglomerate. The Joint Research Centre (JRC) of the European Commission, in collaboration with the National Institute of Standards and Technology (NIST), has produced its first Certified Reference Materials for electrophoretic mobility and zeta potential measurements by electrophoretic light scattering.
January 7th 2021
Detector stability has particular importance where analysis time is long, such as is often found in high resolution GPC/SEC applications. As a result - HPLC detectors adapted for use in GPC/SEC show a significant baseline drift between the beginning and end of a chromatographic separation limiting their ability to accurately determine the beginning and end of sample peaks and therefore to calculate the correct polydispersity. Operating from room temperature up to 80° C with high thermal stability, our Differential Refractive Index (DRI) detector has been designed with particular attention to eliminating drift.
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