12 High Technology Gas Generators for Every Application
Leman Instruments has developed rapidly to become a leading European company specialising in the fi eld of high technology gas generators. The specialist modules of scientifi c equipment concentrates on the provision of standard products, OEMs and in custom designed realisation involving high purity Hydrogen (H2), Nitrogen (N2), Zero Air and combined solutions for FIDs, GCs, purge air generations, CH4 and CO2
gas for LCMS.
Individually equipped with high performance communication interfaces (RS485, Ethernet and WLAN options), the reliable instruments signifi cantly reduce operational costs and provide a solid return on investment within the space of two years. Suitably slotting into laboratory, air quality monitoring and industrial environments, the apparatus has been strategically constructed to suit the majority of these related applications.
These premium quality modules also provide high pressure stability, essentially improving upon the resolution and detection limits of instruments, whilst the constant purity ensures there will be no contamination concerns. Integrating Proton Exchange Membrane (PEM), Pressure Swing Absorption (PSA) and Catalysis technologies, they can be easily controlled via a touch panel or iPad, proving incredibly easy to install and operate.
One of Leman Instruments’ newest innovations is its combined technology gas generator, the GC Station 60LC. The single unit incorporates an inboard compressor and is a concept unlike any other currently offered in the marketplace.
Another notable product from Leman Instruments is the range of Hydro 50ml/min to 15 l/min High Purity Hydrogen Generators for FID and Carrier Gas to fi t almost any type of application which needs High purity H2 production close to the consumer in laboratory environment.
Based on the fi eld proven Solid Polymer Electrolyte (PEM) cell technology, pure Hydrogen is produced at low pressure from electricity and high quality distilled water (Zero Water). This process can be started on demand and does not require any caustic solution. The produced Hydrogen is available 24/7 with constant minimum purity superior to 99.995% and maximum at 99.99995% at output fl ows of 50ml/min to 15 l/min (depending on the model.) The H2 output pressure is regulated electronically and can be set from 0.5 to 10 bar. (7 to 140 psig).
More information online:
ilmt.co/PL/dmOW 52265pr@reply-direct.com scrubbers, N2 and multi
A Wettable HPLC Phase Explained
New Columns Separate a Wide Variety of Polar Analytes
Analysing polar compounds using liquid chromatography has historically been a challenge. Poor retention and peak shape, complex mobile phases that may not be MS-friendly, long equilibration times, low sensitivity, and sample derivatisation are all complications that reduce lab efficiency and productivity. However, new Raptor Polar X columns reliably retain and efficiently separate a broad range of polar analytes using a unique stationary phase that balances two retention mechanisms: HILIC and ion exchange. This hybrid phase is ideal for analysing acidic, basic, and neutral polar compounds without time-consuming derivatisation or complex ion pairing, and it is especially compatible with mass spectrometry. Easy changes to mobile phase conditions allow analysts to switch between modes and selectively tune retention for the compounds of interest without needing long equilibration times. Simplify the analysis of polar compounds with the resolving power of Raptor Polar X columns from Restek.
Recently the Kromasil wettable phase was introduced for production-scale purifi cation of polar substances like biomolecules under aqueous conditions. It is now also available in columns for analytical HPLC applications. Nominally, the wettable phase is a C18 phase. Normally, this is a highly hydrophobic phase. How can such a phase be ‘wettable’?
On a regular C18 phase, if 100% aqueous conditions are gradually applied, the mobile phase can keep fairly good contact with the stationary phase as long as the high pressure in the system is maintained. In this situation the pressure forces the mobile phase to be present in the stationary phase’s pores, despite the repealing force from the hydrophobic surface. If the pressure drops (i.e. at fl ow decrease or stop), the liquid is expulsed from the pores, dramatically reducing the interaction surface between stationary and mobile phases. For the chromatographic properties that means a severe loss in selectivity and coelution of sample components. The surface availability can be restored in the column by switching back to normal phase conditions, though, but the actual chromatographic run can be considered as ruined.
To make the stationary phase wettable in fully aqueous conditions (avoiding dewetting as above), a polar component is introduced on the surface, like a mixed-mode phase. Some have added the polar groups at the root of the surface modifi er. The Kromasil wettable phase has it as polar-embedded end-capping. This also allows for a better chemical stability of the phase under acidic conditions compared to other related purifi cation phases on the market.
For more details about the chromatographic conditions for the illustration of this article, as well as learn more about this phase: properties according to the Tanaka test set, examples and current availability, please visit the wettable phase page on the Kromasil website.
More information online:
ilmt.co/PL/LK03 52864pr@reply-direct.com
More information online:
ilmt.co/PL/2JKj 52693pr@reply-direct.com
Preparative and Semi-preparative LC Autosampler
Are you looking for a preparative or semi-preparative LC autosampler for your sample purifi cation? Maybe during your preliminary product search you have just found very expensive solutions or shoddy devices. HTA are pleased to show you the perfect instrument for your sampling needs: the HT1500L.
The HT1500L is a LC autosampler, compatible with any HPLC systems, that lab technicians describe as ‘reliable, easy to use and high-performance’.
Besides standard analytical confi guration, the HT1500L can be confi gured as both a semi-preparative and a preparative autosampler to perform robust, precise and accurate large-volume injections for fractioning and purifi cation of samples.
For preparative applications, the HT1500L can mount loops with volumes up to 30ml. The full-loop injection technique assures high repeatability of the injection and excellent performance. The sample carousel can hold vials up to 40ml to allow a considerable sample loading and a consequent successful purifi cation.
In addition, the large solvent capacity and the infi nite waste makes the HT1500L
suitable for semi-prep and preparative HPLC and allows needle and whole fl ow path cleaning before processing the next sample to minimise carryover.
The HT1500L is also very competitive in terms of price. Contact HTA to get a custom offer. More information online:
ilmt.co/PL/xXG6
52898pr@reply-direct.com
Interested in publishing a Technical Article?
Contact Gwyneth on +44 (0)1727 855574
or email:
gwyneth@intlabmate.com Our articles are read by over 72,000 readers in print, online and via our Mobile App.
INTERNATIONAL LABMATE - SEPTEMBER 2020
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