38 February / March 2016
Analysis of Diacetyl and other Vicinal Diketones (VDK’s) in Alcoholic Beverages
Vicinal diketones (VDK) are naturally produced compounds in the fermentation process. The monitoring of VDK levels is of great importance as the concentration of these compounds can greatly alter the flavour of a beverage. VDK’s produce a butter like flavour in the beverage so are undesirable in lighter beers that want a clean crisp taste, but are actually wanted at higher levels in wines to give a smoother taste and feel. The most commonly monitored VDKs are 2,3-butanedione also known a Diacetyl and 2,3-pentanedione also known as Acetyl Propionyl. VDK’s are typically found in the 0-100ppb range in beers, and can be anywhere from 100 to 5000ppb in wine.
The rise in popularity of craft beer has seen a dramatic rise in the number of smaller independent breweries. Many of which cannot justify they cost and space of large expensive GC systems. A method has been developed using the Ellutia 200 series Gas Chromatograph and
the Ellutia EL-2100 Head-Space autosampler to provide an offering that can address the analysis at a lower entry price. The System is able to analyse the compounds of interest down to the required low ppb levels.
The Ellutia 200 series GC and EL2100 autosampler can provide a simple lower cost solution to VDK analysis allowing breweries with smaller budgets the ability to perform this useful analysis. For further information please visit
www.ellutia.com
GC Preparative System VPS2800
Hichrom’s 2016 Chromatography Training Courses from World-Renowned Experts
The VPS2800 Preparative Gas Chromatograph System by GL Sciences can collect target compounds which were separated by Gas Chromatography. A highly inert and unique internal flow path is introduced with the VPS2800.
With a unique flow path there is no absorption or contamination. Components coming from the column, passes through the manifold and are recovered in one of the preparative tubes by switching the back pressure gas. In order to prevent contamination, the VPS2800 uses a separate gas for sealing the entrance of the preparative tube that is not in use. The unique deactivation of the sample lines reduces the absorption, resulting in very precise fractions of the chromatogram.
The VPS2800 is equipped with a next-generation electronic cooling function. The Stirling cooler is a completely new cooling mechanism, it uses the intake and exhaust heat during compression and expansion of the refrigerant gas (Helium) in a closed circuit. The Stirling cooler is electrical driven and no liquid nitrogen is needed for cooling. This cooling function result in very low trapping temperatures without the need of cryogenics like LN2 For further information please visit
www.glsciences.com
or CO2 .
Hichrom’s 2016 training programme is now available, featuring courses covering every area of HPLC, UHPLC, GC and sample preparation and delivered by world-renowned experts including John Dolan, Mel Euerby, Mark Powell, Diane Turner, Alan McKeown, Geoff Pickerell, Brian Montgomery, Helen Poole, Gemma Lo and Annette Larder. Whether you are a relative newcomer to chromatography or a seasoned veteran, you can benefit from one of our courses. New
scheduled courses for 2016 include Data Integrity and CIM Monolith Chromatography for Biomolecules.
Costs for our courses are just £35 for a short course and from £195 for a day course and ChromSoc, RSC and IBMS members all receive a 10% discount on all courses. Our courses will show you how to decrease costs, increase throughput, prevent costly method problems occurring, transfer methods between laboratories or from HPLC to UHPLC and develop faster, more reproducible HPLC/ UHPLC or GC assays in a time effective manner. In fact, all of these courses are guaranteed to increase productivity and efficiency in your laboratory, reducing your analysis costs. If this doesn’t happen Hichrom will happily refund your money!
We additionally offer consultancy and advice from industry experts covering all areas of chromatography.
Please contact us to discuss our services on Tel: 0118 930 3660, email or visit our website
www.hichrom.co.uk
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