ARTICLES

The Importance of Understanding Pump Flow

Pumps are one of the most common tools enabling liquids to be moved, delivered, pushed through a separation column, supplied as a dose or transferred from one container to another. Several different pumping technologies are available to choose from, depending on your application or problem. As you might expect - a pump designed to pump crude oil through a pipeline has very different requirements compared to a pump designed to deliver a constant stream of medication into a patient’s vein. As such, the term ‘flow’ can be interpreted very differently, depending on the context.
Published in International LabMate – July 2022
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Investigating Variation in Flow from Peristaltic Pumps

Peristaltic pumps find wide application in modern labs, they are considered inexpensive, easy to use and to maintain and, most important of all, are extremely reliable and flexible. The range of application is huge, from simple transfer of a liquid from one container to another in HPLC and Ion chromatographs, to more complex usage as dispensing tools for reagents in flow chemistry.
Published in MicroBioz India – June 2022
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Investigating Variation in Flow from Peristaltic Pumps

With peristaltic pumps, several flow paths can be operated simultaneously. However, many parameters influence the actual flow rate in each channel. Accurate determination of the individual flow rate in the individual channels is crucial for reproducible results.
Published in Lab Worldwide – February 2022
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Specialty Chromatography Detectors: Make or Buy?

Liquid Chromatography of any kind - HPLC, UHPLC, GPC/SEC, Ion Chromatography or FPLC, is based upon the specific characteristics of the utilised separation column to provide a suitable environment for a particular application or investigation. As such, creating an optimised separation is often considered to be the core of an individual liquid chromatography system. Separation alone, however, does not supply answers, it just creates the correct preconditions whereby chromatography detectors are able to reveal the 'secrets' of your sample. Read on

Common detectors for GPC/SEC Chromatography

This article provides an overview about the detectors most commonly used in GPC/SEC applications, explains differencies within each detector class, provides inforamtions about pro's and con's of each detector and also explores combination of detectors for the most useful hyphenated techniques in GPC/SEC. Read on

Determination of specific refractive index increment (dn/dc)

The specific refractive index increment (dn/dc) is a fundamental parameter for the determination of molecular weight with Static Light Scattering. Its importance will become clear by observation of the Debye's constant in the SLS equation, where the dn/dc is a squared term. As such, any error in the specific refractive index increment will strongly effect the molecular weight results. This is true for both cases, when SLS is used in batch mode, like in case of a goniometer system, or in flow mode like in case of a MALS Detector in GPC/SEC. Read on