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Environmental Laboratory
NEW GC Offers High Sensitivity and Low Maintenance for a Wide Variety of Applications
Shimadzu has released a new top-of-the-line gas chromatograph (GC). The Nexis GC-2030 is based on the concept of superior usability and expandability for a wide variety of analytical applications. For these purposes, the Nexis GC-2030 can be equipped with any of a family of high-sensitivity detectors, such as the unique barrier discharge ionisation detector (BID) or a flame ionisation detector (FID) which offers the world’s highest sensitivity < 1.2 pg C/s related to Dodecane. All detectors are ultra-fast responding with a sampling frequency of up to 500 Hz in combination with a selectable filter time constant down to 2ms.
Figure 1: The next-industry-standard Nexis GC-2030 gas chromatograph provides the world’s highest sensitivity and reproducibility and outstand- ing analysis productivity.
Gas chromatographs are used for R&D and quality control in a wide range of fields. With a growing concern about safety and minimising any impact on both humans and the environment in recent years, there is an increasing demand for analysing trace impurities in raw materials and analyzing the gases emitted from products. This requires analytical instruments able to output reliable results regardless of the skill level of the operator.
Therefore, the Nexis GC-2030 was designed to offer the high sensitivity analytical capability and high expandability demanded by
the market, while also featuring functionality that enables almost anyone to easily operate and maintain the instrument intuitively.
Equipped with a full colour LCD touch panel, the Nexis GC-2030 can be operated intuitively by simply touching the clearly organized and easy-to-understand interface. It also allows users to configure various parameter settings, perform self-diagnostics, automatically check for carrier gas leaks, and display chromatograms via the interface on the main GC unit. A variety of innovations are included to minimise the time and effort required for maintenance.
Equipped with a CPU, the advanced flow controller (AFC) enables ultra-high-speed and ultra-high-precision flow control that results in exceptional reproducibility. It supports a variety of control modes, such as carrier gas constant linear velocity control, constant flowrate control, and constant pressure control. Multi-step programs can be created for each control mode as well. Additional detectors can be installed via up to four ports, such as a flame ionisation detector (FID) offering the world’s highest sensitivity, or a dielectric barrier discharge detector identifying trace quantities of most components at sub-ppm levels.
Specialised analysers (GC systems) can be configured for specific needs by connecting flow lines to up to three ports, detectors to up to four ports, or up to eight valves to an optional valve box. Enhanced compatibility with Advanced Flow Technology (AFT), which enables back flushing, switching between detectors, detector splitting, and heart-cutting, helps improve productivity by reducing laboratory space requirements and increasing analysis speed. Compatibility with the carrier gas saver function and the sleep mode significantly reduces gas consumption and operating costs.
The new LabSolutions software features a new graphical user interface that significantly improves usability. It allows the instrument status to be determined at a glance and the parameter settings window to be displayed with a single click. Also, various functionalities to ensure compliance with FDA 21 CFR Part 11 and data integrity provide powerful support for laboratory management workflow.
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The complexity of dried sample matrices, such as teas and spices, frequently poses a challenge to food chemists when analysing for residues. These extracts, containing residual oils and pigments, can contaminate chromatographic systems and cause both instrument fouling as well as inaccurate or irreproducible results. While the well-known and widely used QuEChERS cleanup approach is “Quick, Easy, Cheap, Effective, Rugged, and Safe,” the use of bulk salts and adsorbents, along with shaking and centrifugation, often does not provide sufficient capacity/efficiency to remove the concentrated matrix interferences associated with these dry commodities.
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Alternatively, solid phase extraction (SPE) cartridges, having a higher capacity/efficiency for matrix removal, are often used to remove these problematic interferences. Typically, along with other adsorbents, these SPE cartridges contain graphitised carbon black (GCB) for retention and removal of pigments from the extract. While the planar, graphitic surface of traditional GCB allows for excellent removal of chlorophyll and other pigments, it unfortunately also retains planar aromatic compounds such as planar pesticides. Typically toluene is often needed to recover the planar analytes. Consequently, toluene introduces additional problems later in the work up and analysis.
Mercks’ multi-bed Supelclean™ Ultra 2400 SPE cartridges are designed for the cleanup of extracts from dry/difficult samples prior to pesticide residue analysis, typically performed by GC/MSMS and LC/MS/MS. These cartridges contain primary-secondary amine (PSA), C18, zirconia-coated silica (Z-Sep), and a specialised, spherical carbon. These adsorbents provide an optimal balance between analyte recovery and interference removal without the use of toluene.
The top bed of the Ultra 2400 cartridge contains a mixture of PSA/C18 and graphitised, spherical carbon. The PSA removes acidic interferences, the C18 retains some hydrophobic lipid interferences, and the carbon removes unwanted pigments. The specialised carbon adsorbent used in this cartridge was engineered to remove sufficient pigmentation while also allowing for acceptable recoveries of compounds with planar structures. The bottom bed of the cartridge contains Z-Sep, which removes remaining oily residues and provides additional pigment removal. As seen with the analysis of pesticides in turmeric, the cartridge can be used for cleanup of acetonitrile extracts to be analysed by either GC or HPLC.
IET May / June 2017
www.envirotech-online.com
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New SPE Cartridge for Residue Analysis in Spices, Teas, and Other Dry Commodities
New Field Analytics System For Matrix Gemini LIMS Extends Use To The Field
The new Matrix Gemini Field Analytics System from Autoscribe Informatics extends the use of the LIMS (Laboratory Information Management System) to the field. Further enhancing remote access capabilities for Matrix Gemini, the new Field Analytics System allows test data to be recorded off-line and uploaded to the LIMS when an internet connection can be re-established.
The Field Analytics System is designed to operate on an Android tablet or mobile device and sync with the Matrix Gemini LIMS database. It enables users to select and download the sample information they want from Matrix Gemini. The sample data can be edited and relevant test results recorded off-line.
Results are automatically checked as they are entered to ensure they are a valid type (numeric, test etc.). Updated results are stored until an Internet or mobile data connection becomes available and it is convenient to upload the data to the Matrix Gemini LIMS database server.
Communicating with the database server via a web service, the Field Analytics System authenticates user rights before allowing access for data download/upload. It also records user identities when data is uploaded or changed. To limit the data downloaded, users may specify which samples are of interest. This keeps sync times to a minimum. A built-in search facility allows users to limit the number of samples shown at any one time on the device.
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New Evaporative Technique Improves Environmental Sample Preparation
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Genevac reports on a customer paper that describes the development and advantages of a new evaporative methodology for Mass Spectroscopic (MS) analysis replacing the traditional Solid Phase Extraction (SPE) technique for preparing environmental samples.
In recent years HPLC/ MS/MS and UPLC have become the sensitive and specific techniques
of choice for the detection of algal toxins in water. While the majority of published studies employ SPE for preparing environmental samples for MS or UPLC analysis, using this methodology can be very time consuming.
In this paper a direct solvent evaporation methodology, using the Genevac EZ-2 evaporator, is evaluated as a means to reduce the lengthy sample preparation process prior to MS analysis and to improve efficiency.
The authors demonstrate that using the EZ-2 for their sample preparation reduces processing time, simplified sample preparation and eliminated variability in percent water of the final solution. They conclude that the direct evaporative sample preparation method offers distinct advantages over SPE by eliminating the sample clean-up step, improving reproducibility, decreasing analysis time, minimising waste generation and being more cost effective. In addition, as minimal sample handling is required using the direct evaporative methodology, this reduces the risk of cross contamination and analyte loss.
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