2573 Results for: "GC Columns"

Supplier: Restek

Needle files, MXT®, for cutting Siltek® treated stainless steel columns

Supplier: Thermo Fisher Scientific

The Zeba™ Desalting chromatography cartridges, 7 kDa MWCO, contain a high-performance resin for desalting or buffer exchange applications. This resin is ideal for removing low molecular weight compounds including salts, fluorescent dyes, biotin and other small labeling reagents. Zeba™ Desalting Cartridges provide fast, easy and reproducible chromatographic separations and can be regenerated for multiple uses. They efficiently process samples from 50 to 1500 µl.

Supplier: VARIAN

Bond Elut™ C18 is the most hydrophobic, bonded silica sorbent in the Bond Elut™ range. It is the most popular SPE sorbent because of its extremely retentive nature for non-polar compounds. C18 is generally regarded as having the broadest spectrum of retention among bonded silica sorbents, since it retains most organic analytes from aqueous matrices. When analysing small to intermediate molecules, Bond Elut™ C18 can be used for desalting aqueous matrices prior to ion exchange, as salts pass through the sorbent unretained.

Supplier: VARIAN

Bond Elut™ NEXUS is an ultra-clean polymeric sorbent which has bi-modal porosity and a high surface area. NEXUS offers a nonpolar retention mechanism with no pre-conditioning required. The large particle size makes NEXUS ideal for extractions from highly viscous samples, such as horse urine.

Based on the same base polymer technology, Bond Elut™ NEXUS WCX is a weak cation exchange sorbent that offers extra selectivity for analytes, such as quaternary ammonium drugs and anabolic steroids.

Supplier: VARIAN

Bond Elut™ PSA is an alkylated amine sorbent that contains two different amino functionalities, one secondary and one primary. This gives a slightly higher pKa and ionic capacity compared to Bond Elut™ NH₂. The PSA functional group is a very effective bidentate ligand and is therefore an excellent sorbent for chelation applications. PSA has a significantly higher carbon load than most amino functional sorbents and thus is a better choice for polar compounds, which retain too strongly on Bond Elut™ NH₂.

Supplier: Thermo Fisher Scientific

HyperSep™ Retain™ PEP polymeric SPE material is a high purity, highly porous polystyrene DVB (divinyl benzene) material modified with urea functional groups to give balanced retention of polar and non polar analytes. HyperSep™ Retain™ PEP is ideal for a wide range of applications, such as drugs and metabolites in biological fluids, peptides in serum, plasma or biological fluids and environmental fluids.

Supplier: VARIAN

Bond Elut™ SCX is a strong cation exchanger with a very low pKa. Although the pKa is similar to Bond Elut™ PRS, the presence of the benzene ring in the functional group increases the potential for non-polar interactions. This non-polar characteristic becomes particularly important when conducting ion-exchange from aqueous systems, where selectivity towards compounds exhibiting cationic and non-polar character is seen.

Supplier: Agilent

The micro ECD has a detection zone volume 10 times smaller than any other ECD with replicable inlet liner to decreasing column contamination of the cell.

Supplier: Agilent

Step 2: Dispersive SPE cleanup
Select the dispersive SPE kit suited to the type of food being analysed and the method you are following. In this step, an aliquot of the sample extract from step one (see QuEChERS extraction kits) is added to a 2 or 15 ml centrifuge tube containing a small amount of SPE sorbent and MgSO₄. The sorbent will pull out interfering matrix materials from the sample, while the MgSO₄ helps remove excess water and improve analyte partitioning.

Supplier: Restek

Liners are used for conversion of ¼" packed injection port.

Supplier: VARIAN

Due to the methyl group and subsequent low carbon load, Bond Elut™ C1 is the least retentive of all alkyl group bonded phases for non-polar compounds. However, due to the extensive end capping of this sorbent to mask polar silanol activity, retention and elution of polar and multi-functional analytes can still be achieved. Typical applications include plasma, urine and aqueous samples.

Supplier: VARIAN

The water-wettable, hydroxylated exterior allows excellent flow, even with biological fluids. A gradient of polarity on the polymer surface shunts small analytes to the more hydrophobic centre of the polymer bead, where they are retained prior to the washing and elution steps. Plexa provides these performance enhancements due to a unique polymeric architecture with a non-retentive, hydroxylated, amide-free surface and a non-polar PS/DVB core for retaining small molecules.

Supplier: Agilent

Step 1: Extraction
Choose the extraction salt packet based on your method of analysis, AOAC or EN. The buffered extraction salts are amenable for more liable pesticides. Adding solvent and then salts to a comminuted fruit or vegetable sample (10 g or 15 g) enables you to extract the pesticides of interest into the organic layer. However, adding a food sample with a high percentage of water directly to the salts may create an exothermic reaction that can affect your analyte recoveries.

Supplier: VARIAN

Bond Elut™ Certify II was developed specifically for the rapid and effective extraction of acidic drugs and metabolites from urine and other biological matrices. Certify II is a mixed-mode cartridge packed with non-polar C8 and strong anion exchange (SAX) sorbent. It has been optimised for acidic drugs such as 11-nor-delta-9-tetrahydrocannibinol-carboxylic acid, salicylic acid, ibuprofen, acetaminophen and other compounds that possess both non-polar and anionic characteristics.

Supplier: Restek

This gas management system removes moisture, hydrocarbons, and oxygen from carrier gas, extending column lifetime.

Supplier: Restek

These liners can be used with Agilent GCs.

Supplier: Restek

Ferrules with graphite construction for use with packed columns.

Supplier: Restek

Packing material, Porapak S, mesh size of 80/100, temperature limits of 250 °C

Supplier: Restek

Set the column flow rate by injection the methane and optimising linear velocity is preferred method for establishing reproducible retention times.

Supplier: Restek

Use these liners for increased sensitivity.

Supplier: Restek

Packing material, HayeSep® A, mesh size 60/80, temperature limit up to 165 °C

Supplier: VARIAN

Clean gases reduce the risk of column damage and improve accuracy and sensitivity. These unbreakable and self-indicating filters give high sensitivity to oxygen and moisture and can be installed in seconds without tools.

Supplier: Trajan Scientific and Medical

Autosampler syringes for AOC14, AOC17 and AOC20.

Supplier: Restek

Inlet seals are used at the base of the Agilent 5890/6890/7890 GC injection port, which contacts the sample and should be changed frequently to prevent adsorption of active compounds. In addition, septum fragments and sample residue accumulate on the disk surface, requiring disk replacement.

Supplier: Agilent

UltiMetal Plus, Flexible metal ferrule, for UltiMetal column tubing, Metal, Hole Ø: - mm, Tubing int.Ø: 0,53 mm

Supplier: Restek

These bonded silica packings with n-octane or cyanopropyl (OPN) functional groups yield faster separations of C1 to C4 hydrocarbons, higher thermal stability, shorter conditioning times, and longer lifetimes.

Supplier: Trajan Scientific and Medical

Autosampler syringes for PerkinElmer AutoSystem.

Supplier: SHIMADZU

COLUMN HANGER FOR GC-2010 1 * 1 items

Supplier: VARIAN

GC Column 50% Phenol 1 * 1 items

Supplier: HICHROM

COLUMN MEGA-5 GC 10MX0.32MMX5.00UM 1 * 1 items