Tag Archives: SEC


Published 25 Sep 2019

Rh or Rg: Which is best for my GPC/SEC samples?

The primary goal when employing gel permeation / size exclusion chromatography (GPC/SEC) is often to determine the molecular weight of a macromolecular sample.  Multi-detector systems, such as Malvern Panalytical’s OMNISEC and TDAmax systems, are able to offer a range of…READ MORE >

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Published 3 Sep 2019

Help! I need some…GPC/SEC expert advice

There are many things to consider when maintaining a GPC/SEC instrument: the mobile phase, the column set, the pump components, the post-column filter, and up to four different detectors…all in a single system! And that’s not even accounting for your…READ MORE >

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Published 13 Aug 2019

Can my GPC/SEC chromatogram be trusted?

You’ve done the hard parts to get your GPC/SEC instrument ready: prepared the mobile phase, stabilized the detector baselines, and prepared your sample.  After injection and completion of your sample sequence, you have acquired data.  Congrats!  Now, before you even…READ MORE >

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Published 23 Oct 2017

Polydispersity – what does it mean for DLS and chromatography?

The term polydispersity (or more recently dispersity without the poly, as per IUPAC recommendation) is used to describe the degree of “non-uniformity” of a distribution.  In the field of molecular/nanoparticular characterization, there are in principle two different definitions of polydispersity,…READ MORE >

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Published 4 Apr 2017

Malvern’s Top Content Q1 2017

You all know now that at Malvern, we like producing regular content which is dedicated to you, depending if you are a student, researcher or scientist. I really hope that this new Top Content from the last quarter will help…READ MORE >

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