Vol. New productsdownloads.hindawi.com/journals/jamc/2000/824079.pdf · Journal ofAutomatedMethods &Managementin Chemistry, Vol. 22, No. (January-February 2000) pp. 29-32 Newproducts

Journal of Automated Methods & Management in Chemistry, Vol. 22, No. (January-February 2000) pp. 29-32

New products

(2.I. expands sorption testing service

C.I. Electronics has expanded its sorption test facility,providing the chemical industry with a fast, cost-effectiveroute to high-quality information on the water sorptionbehaviour of a wide range of materials. The new,purpose-built laboratory provides a controlled environ-ment for sorption testing which enhances C.I.’s develop-ment facilities as well as increasing threefold the capacityof its testing service. It affords ideal conditions for meas-urements of the highest accuracy and consistency, whileC.I.’s CISorp technology for automated analysis offerssubstantial productivity gains to companies currentlyemploying manual measurement techniques.

Existing users of C.I.’s testing service benefit from thevast experience of a world leader in microbalance meas-uring technology. Ensuring that clients derive maximumvalue from its expertise in measurement of adsorption/desorption isotherms and kinetic testing, C.I. offers theservices of a dedicated scientific consultancy team whichwill assist with optimization of the test regime. Followingthe investigation, the company supplies the raw data plusa detailed report containing experimental results andplots, together with an informed interpretation of results.

For further information contact Elaine Roberts, C.I. ElectronicsLimited, Brunel Road, Churchfields, Salisbury SP2 7PX, UK;Tel: +44 (0)1722 336938; Fax: +44 (0)1722 323222;e-mail: [email protected]; website: http: /www.cielec.com

Faster, easier qualitative determination of fra-grance compounds in hops from Shimadzu ’head-space technology’

The use of scientific techniques for the analysis offragrance compounds in hops has long been part of thebrewer’s art. A method using the headspace technique forgas chromatography and mass spectrometric analysis hasbeen introduced by Shimadzu--one of the world’s lead-ing manufacturers of analytical instruments--which isproving a powerful tool for qualifying fragrance sub-stances.

Because of the easy sample handling associated with thistechnique, mistakes in sample preparation are avoidedand, as analysis is performed with an autosampler, themethod saves time compared to extraction. Quantifica-tion can also be performed using several calibrationmethods, for greater ease and user-friendliness.

Another benefit of the headspace method is the preven-tion of contamination of the injector and prolonged life ofthe column.

Using the headspace approach in a recent Shimadzu test,the effect of different conditioning temperatures wasstudied using two samples.

Under normal analysis protocols, 2 g of solid hop sampleor granulate is added to a vial which is sealed gas-tightwith a septum and cap. The sample is then conditioned

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New products

until an equilibrium state is reached, which will dependon the conditioning temperature, the compounds to beanalysed and the conditioning time, all of which need tobe determined experimentally.

In this test, the samples were conditioned for 45 min at 80and 120C respectively, in order to compare results.

At the higher temperature, the peaks revealed by gaschromatography-mass spectrometry (GC-MS) analysisare much increased, and some compounds are muchmore easily detected. Because the fragrance substancescharacteristic for hops--delta-cadinene, farnesene andhumulene--elute after 20 min, a higher conditioningtemperature can therefore be seen to ensure maximumsensitivity.

Some fragrance substances show nearly the same frag-mentation pattern, so it is useful to work with privatelibraries and retention indices, which will give usefulinformation for spectra interpretation, as well as com-mercial libraries, e.g. NIST 75.000.

It is particularly advisable to use GC-MS techniqueswhen a number of samples need to be compared, as thiswill give greater speed and accuracy. It is possible tosubtract the spectra of two peaks in a special comparisonwindow, e.g. to show quickly and easily whether the twosubtracted compounds are identical or if there is coelu-tion at the same retention time.

Qualitative analysis for single compounds can be per-formed very easily using multi-ion chromatograms. Foralpha-humulene, e.g. typical mass traces m/z 93, m/z 80and m/z 121 can be used to identify the substance easily,along with the typical ratio of the masses. This informa-tion is available in the libraries.

For more information, please contact: Shimadzu UK, Mill Court,Featherstone Road, Wolverton Mill South, Milton KeynesMK12 5RE, UK: Tel: +44 (0)1908 552200; Fax: +44(0)1908 552211; e-mail: [email protected] or RossHeaven, Strong Words, 32 Cranstoun Street, NorthamptonNN1 3BH, UK; Tel/Fax: +44 (0)1604 250221; e-mail:[email protected]

tables to be determined accurately and in a fully auto-mated way to ensure perfect end results in foodmanufacture, blending and processing.

Using this technique, the material to be investigated isfirst cut up coarsely and 5 g added to a headspace vial. Itis important not to cut up the material too finely, orsubstantial and uncontrollable losses of active substanceswould result from the reaction of residues with the acidsof the plant tissue. Analysis should follow quickly fromsample preparation so that results are reproducible insubsequent analyses.

Chromatographic conditions for analysis are a condition-ing temperature of 80C for 60 min with a detectortemperature of 260C and an injection temperature of210C at a volume ot"0.8 ml. An extensive purge and trapprocedure is not necessary as the technique ensures themeasurement of all searched components with highsensitivity, with individual peaks assigned quickly andaccurately using mass spectroscopy. Significant masstraces can also be underlayed beneath the total ionchromatogram to facilitate the search routine.

Private ftavour and fragrance libraries as well as thosecommercially available can be integrated into the search,which is ideal for analysis of compounds in particularfood manufacturing applications.

The Shimadzu technique is highly accurate and sensitive,allowing manufacturers consistency of aroma and flavourin food products. Better still, the process is fully auto-

mated so analysis time and costs are considerably re-duced.

For more information on this application andfor details of otherShimadzu products for food manufacturing and processing,contact: Shimadzu UK, Mill court, Featherstone Road, Wolver-ton Mill South, Milton Keynes MK12 5RE, UK; Tel: + 44(0)1908 552200; Fax: + 44 (0)1908 552211; e-mail: [email protected]; Ross Heaven, Strong words, 32 CranstounStreet, Northampton NN1 3BH, UK; Tel/Fax: + 44(0)1604 250221; e-mail: [email protected]

Ensuring appealing taste and aroma in onion-based food products

Maintaining the aroma and taste of freshly cut onions isimportant for food products and preparations based onan onion content, and for greater consumer appeal ofsalad and cooking onions themselves.

This distinctive aroma derives from a high content ofvolatile compounds within the onion--scientificallyknown as (E)-(+)-S-(1-propenyl)-L-cystein sulphoxyd.The addition of intermediate products then enables mul-tiple chemical processes to take place so that numerousend-products can be built from this base.

Shimadzu--one of the world’s leading manufacturers ofchromatography and mass spectrometry instruments--offers a procedure using its QP-5000 mass spectro-meter, GC-17A gas chromatograph, HSS-4A headspacesampler and NIST 75.000 spectra library of flavours andfragrances, which enables the sulphur content of vege-

Spectrum TimeBase software

Spectrum TimeBase is an exciting new time-resolvedsoftware package offering improved 3D graphics, fastcalculations and new data viewing options. It can beused for data collection and display in GC-IR, TG-IR,kinetics, reaction monitoring, LC-IR and GPC-IRstudies.

Spectrum TimeBase will control time-resolved data froma wide range of Perkin-Elmer IR instruments, includingthe Spectrum One, Spectrum GX, Spectrum 2000,System 2000, Spectrum RX, Spectrum BX, Spectrum1000 and Paragon 1000 instruments.

For further information, contact Carole-Anne Green, Perkin-Elmer Limited, Post Office Lane, Beaconsfield, Bucks HP91QA, UK; Tel: +44 (0)1494 676161. extn 3269; Fax:+ 44(0) 1494 679331/3; e-mail: [email protected];website: http: /www.perkin-elmer.com

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New products

Synthesis Monitoring System

The use of solid-phase synthesis in combinational chem-istry is now established as an exciting new technique inthe drug discovery process. It meets the chemist’s require-ment for rapid screening of reaction products whilst theyare still bound to the solid phase resin. Perkin-Elmer’snew Synthesis Monitoring System, based on FT-IRspectroscopy, allows rapid analysis from a few reactionbeads. The expert software automatically comparesspectra from ’before’ and ’after’ reaction stages, withthe spectral information being correlated with functionalgroup information. Reaction optimization can also beaided by estimating the percentage completion of thereaction.

This new monitoring system will be of particular interestto all scientists working in the fields of combinationalchemistry and drug development.

For ,further information, contact Carole-Anne Green, Perkin-Elmer Limited, Post OJfice Lane, Beacons.field, Bucks HP91QA, UK; Tel: + 44 (0) 1494 676161 extn 3269; Fax: + 44(0) 1494 679331/3; e-mail: [email protected],Website: http //www.perkin-elmer.com

Analytical instrument nitrogen generator willserve primary applications for LC/MS and solventevaporation

An analytical nitrogen generator that produces puritylevels of dry nitrogen of 99-99.9% has been designed byWhatman International for the specific purpose of sup-plying LC/MS instruments as well as for solvent evapora-tion (see photo on right).

To operate the Type N2-2010 generator, it only requiresto be connected by a 1/2tt inlet connection to a supply ofcompressed air ranging from 4.2 to 10 bar to produce amaximum flow rate of nitrogen of 621 min-1 Payback onnitrogen systems can typically range from six months upto two years.

No electrical connections are required, and maintenanceis only an annual change of prefilters, a carbon tower anda particulate final filter.

The physical size of the unit is 610 mm wide x 510 mmdeep x 1750 mm high, and it weighs 14 kg.

For more information, contact: Kelly ./Vewvell, Whatman Inter-national Ltd., Whatman House, St Leonard’s Road, 20/20Maidstone, Kent ME16 OLS, UK; Tel: +44 (0)16"22676"6670; Fax: + 44 (0) 1622 677011

New deuterium/tungsten light source for hand-held spectroscopy

A new, complete light source, Fiberlight, which has beenpurpose developed for hand-held, fibre-coupled UV-Visspectrometers, is now available from Heraeus NoblelightLtd, Cambridge. Fiberlight features a miniature deuter-ium lamp, for UV light, and a tungsten lamp, for visiblelight, with an integral shine-through arrangement andoptical system.

Ultraviolet light from deuterium lamps is an essentialcomponent of any optical analysis technique, e.g. spec-troscopy and high-pressure liquid chromatography,which measures the variation in the amount of UV orvisible light absorbed by the sample under analysis.Deuterium lamps have always been used for theseapplications because of their high stability and the factthat they produce a line-free, continuous spectrum in theultraviolet region. However, to date, size and powerconsumption have prevented these lamps being appliedin hand-held analysis.

The miniature deuterium lamp of the new Fiberlight unitis an electrode-less high-frequency excited gas dischargelamp, of just 3 W power consumption, which generatesnegligible heat. The associated tungsten lamp also has a

power requirement of 3 W. The light exit from the unitis through an SMA fibre optic connector, and allelements of the unit, including shutter, optical systemand 12 V DC power supply are mounted on a circuitboard.

With its compact size, low weight and high-qualityspecification, Fiberlight is ideally suited to hand-heldspectroscopy applications, e.g. water analysis, diagnosisand pollution control measurements. It can also be usedwith battery-driven spectrometers [br field analysis andon-line process control.

Heraeus is one of the pioneers of UV lamp technology,especially of the deuterium lamp. It operates very closely

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New products/Meeting report

with other researchers, industrial development engineersand instrumentation manufacturers to ensure continuousproduct development, not only in lamps but also inancillaries and systems, e.g. the new Fiberlight lightsource. This total capability ensures that manufacturersand users of analytical instrumentation achieve optimumperformance from highly sophisticated equipment.

Heraeus Noblelight Ltd, part of the Heraeus Group,specializes in the production and application of high-

quality energy sources covering the entire electro-magnetic spectrum, from ultraviolet to infra-red. Itoffers a range of UV lamps to match most of the UV/VIS Spectrometers and HPLC UV Detectors in usetoday.

For more information contact Martin Woods, Heraeus NobMightLtd, Cambridge Science Park, Milton Road, Cambridge CB44GQ, UK. Tel: + 44 (0) 1223 423324, Fax: + 44 (0) 1223423999

Meeting report

P S Analytical sets the standard at Pittcon 99

At the Pittsburgh Conference in Orlando, Florida, P SAnalytical introduced a number of exciting new productswithin its Millennium and Sir Galahad product ranges.

The Millennium Merlin/Galahad instrument has beenintroduced to fulfil the expectations of the EPA 631methodology. The PSA 10.025 encorporates a goldamalgamation step into the already proven MillenniumMerlin. The instrument can be used with either thestandard PSA carousel autosampler or the new xyzmodel. The introduction of the amalgamation stepincreases the detection capabilities of the Merlin systemwith a sample throughput of 10 samples per hour.

The standard Millennium Merlin has a detection rangeof <0.2ppt quantity at a sample throughput of 30samples per hour. One further unique features of thisrange is the ability to analyse samples in the 0-10ppmrange without any system modification.

Mercury, arsenic and selenium speciation are fast becom-ing significant, not only in the academic research areabut also for future regulatory issues. The Millennium

range of products can be readily integrated into chroma-tographic or purge-and-trap schemes to develop specia-tion profiles. To enable the products to do this, PSA hasdeveloped a simple retrofit 0-1 V option for the Millen-nium range, and is also able to provide the users withstandard kits to enable speciation studies to be readilyachieved.

In the petrochemical industry, there is also considerableinterest in the determining presence of mercury either as

mercury(0) or organic derivations. P S Analytical alsointroduced its PSA 10.515 preconcentration device toassist in the analysis of mercury levels in petrochemicalcondensates. This new instrument can handle 0-1 glsamples of condensates, and prepares samples prior to

analysis by the PSA Sir Galahad instrument. Speciationprofiles can be readily provided using the PSA 10.727 gaschromatography-atomic fluoresence system.

Details of all of these new products are available from P SAnalytical, Arthur House, Crayfieldf Industrial Estate, MainRoad, Orpington, Kent BR5 3HP, UK. Tel: +44 (0)1689891211; Fax: + 44 (0)16"89 896009; e-mail: [email protected]; URL--http www.psanalytical.com

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Vol. New productsdownloads.hindawi.com/journals/jamc/2000/824079.pdf · Journal ofAutomatedMethods &Managementin Chemistry, Vol. 22, No. (January-February 2000) pp. 29-32 Newproducts