7 Dual-Membrane Syringe Filters Provide Heavy-Duty Sample Clarification
Phenomenex, Inc introduces the Phenex™-GF/NY dual-membrane syringe filter for viscous, particulate-laden samples. The new filter incorporates a glass layer, through which the sample passes first for elimination of heavy particulates, increasing the effectiveness of the second, nylon fibre membrane.
By removing particulates from the sample, the syringe filter prevents buildup and blockage of chromatography columns and frits while minimising wear and tear on injection valves. Proper sample filtration can ultimately reduce system downtime and component replacement.
Ideal for any applications with highly viscous or heavily particulate-laden samples, such as foods, biological fluids, soil and fermentation broths, Phenex-GF/NY performs at higher capacity than nylon-only filters, and requires less hand pressure to filter the sample. Phenex syringe filters are optimised for superior flow rates and high throughput.
Target applications include food and beverage and environmental testing.
“These new Phenex filters are part of our growing line of chromatography accessories,” commented J.T. Presley, Brand Manager for Phenomenex. “They offer a convenient and inexpensive way to clarify samples for peace of mind, extended column and system lifetime and improved analytical results.”
Circle no. 319
Engineering Nanoparticle Coatings
Researchers working at NanoQAM, the nanotechnology research centre of the University of Quebec, are successfully innovating novel polymer coatings on the basis of data measured using a Viscotek high temperature gel permeation chromatography (HT-GPC) system from Malvern Instruments.
The system is proving crucial for efficient polymer characterisation, reliably providing absolute molecular weight and structural information to support research goals. A dependable high temperature solution is a pre-requisite for the polymers under test, as it is for bulk polyolefins.
“We rely heavily on the Malvern HT-GPC system because of the comprehensive, accurate information it provides,” remarked Dr Jerome Claverie, Director of NanoQAM, and Professor at the University of Quebec. “GPC analysis of our polymers is challenging but the system performs consistently and reliably.
Ongoing costs are low because the system is easy to maintain and consumables are affordable, which drives down the ‘cost per injection’, an important comparative indicator for us. And the software is excellent. It gives us the flexibility we need to fully explore our materials and at the same time allows new users to get useful data with minimal training.”
A key focus of Dr Claverie’s research is the development of polyolefin-based copolymers that are more hydrophilic. The aim is to produce coatings for nanoparticles that combine the mechanical properties of polyethylene with other capabilities, easily taking a dye for example. Studying the molecular weight and branching behaviour of these copolymers uncovers the structure-property relationships necessary to efficiently tailor polymerisation reactions for their production.
Malvern has developed the Viscotek HT-GPC system specifically for polyolefin analysis. These polymers are only sparingly soluble, necessitating the use of high temperatures throughout the analytical cycle. The Viscotek HT-GPC provides a reliable, cost-effective solution for operation at temperatures up to 160o
C.
The full triple detector configuration delivers absolute molecular weight without extrapolation or correction, molecular size (Rg and Rh), intrinsic viscosity and branching information in a single GPC/SEC experiment.
Circle no. 320 Circle no. 321
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