347 Results for: "Mobile phases and phase modifiers"

Supplier: Merck

These non-polar methyl silicone bonded poly(dimethyl siloxane) columns are used to separate the sample components according to boiling point.

Supplier: Merck

N,N-Dimethylacetamide, SupraSolv® for headspace gas chromatography, Supelco®

Supplier: Merck

These bonded SUPELCOWAX® 10 columns are widely used for separation and purity analyses of many polar compounds, including alcohols, aromatics, and other solvents, flavors, fragrances and FAMEs.

Supplier: Merck

ZIC®-pHILIC has the same stationary phase as ZIC®-HILIC, but is instead based on a polymeric particle for enhanced pH stability. The lack of silica practically nullifies background in high sensitivity detectors such as charged aerosol used for determination of organic and inorganic ions.

Supplier: Merck

This non-polar column is specially designed for reproducible analyses of plant sterols, cholesterol, and other animal sterols.

Supplier: Merck

Water, SupraSolv® for headspace gas chromatography, Supelco®

Supplier: Merck

Dimethyl sulphoxide ≥99.7% (by GC), LiChrosolv® for liquid chromatography, Supelco®

Supplier: Merck

This intermediate polarity column is mainly designed for analyses of volatile organic compounds (VOCs), offers great retention and resolution of highly volatile compounds.

Supplier: Merck

The MultiScreen® deep well solvinert filter plate is intended for a wide range of applications including total drug analysis, bead cleavage (solid-phase combinatorial chemistry and peptide synthesis), and sample preparation before high-performance liquid chromatography (HPLC)/ultraviolet (UV) and liquid chromatography-tandem mass spectrometry (LC-MS/MS). This filter plate is fully automation compatible.

Supplier: Merck

N-Methyl-N-(trimethylsilyl)trifluoroacetamide for gas chromatography, Supelco®

Supplier: Merck

Diethyl ether, SupraSolv® for gas chromatography, Supelco®

Supplier: Merck

EXtrelut® NT is a specially processed, inert, wide pore kieselguhr with a high pore volume. It has been used for quite some time within research, for the sample preparation of urine, whole blood, plasma and other biological matrices. Other applications include environmental and residue testing such as analysis of industrial, domestic and wastewater. EXtrelut® NT is supplied either pre-packed in cartridges or as a loose sorbent. EXtrelut® NT simplifies liquid-liquid extraction by replacing separation funnels. Using a single step is more efficient, saves solvent, as well as material and time, in contrast to classic funnel separation. The aqueous sample is simply applied to the EXtrelut® NT sorbent. It distributes itself over the chemically-inert matrix so acting as a stationary phase. Subsequently, elution takes place using organic solvents that are non miscible with water. All the lipophilic substances are extracted from the aqueous into the organic phase.

Supplier: Merck

Isohexane (mixture of isomers), SupraSolv® for gas chromatography, Supelco®

Supplier: Merck

Tebutam CRM may also be used as given below:
Optimisation of sample extraction based on QuEChERS and dispersive-solid-phase extraction (d-SPE) clean-up for the multi-residue analysis of 120 pesticides 16 polycyclic aromatic hydrocarbons and 22 polychlorinated biphenyls by liquid and gas chromatography coupled with tandem mass spectrometry (MS/MS)
Evaluation of 250 pesticide residues extracted by QuEChERS method from 103 processed fruit samples using ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS)
Determination of 90 pesticides 16 polycyclic aromatic hydrocarbons and 22 polychlorinated biphenyls in honey samples by using QuEChERS combined with dispersive solid-phase extraction (SPME) for sample pre-treatment and liquid chromatography-triple-quadrupole tandem mass spectrometry and gas chromatography-ion-trap tandem mass spectrometry for quantitation
Screening and quantification of 569 pesticides in honeysuckle samples by a combination of ultrahigh-performance liquid chromatography (UHPLC) and quadrupole-Orbitrap high-resolution mass spectrometry
Simultaneous determination of 134 pesticide residues in tea samples using d-SPE extraction with a multi-functional filter (MFF) followed by ultra-high performance liquid chromatography (UPLC) and quadrupole time-of-flight mass spectrometry (TOF-MS).

Supplier: Merck

This column provides boiling point elution order with a slight increase in selectivity, especially for aromatic compounds.

Supplier: Merck

This column is specially designed for purge-and-trap analyses of volatile halogenated, non-halogenated, and aromatic contaminants from environmental samples.

Supplier: Merck

Suplex pKb-100 columns feature the same bonded phase functionality as SUPELCOSIL LC-ABZ columns. These specially deactivated columns differ in that Suplex pKb-100 is not endcapped, while SUPELCOSIL LC-ABZ is endcapped. The absence of the end-capping reagent results in better performance from Suplex pKb-100 for the strongest basic compounds, while LC-ABZ is preferred when the sample also contains acids and/or zwitterions.

Supplier: Merck

N,N-Dimethylformamide ≥99.9%, LiChrosolv® for liquid chromatography, Supelco®

Supplier: Merck

Methanol, SupraSolv® for gas chromatography, Supelco®

Supplier: Merck

Acetonitrile, SupraSolv® for gas chromatography, Supelco®

Supplier: Merck

Suitable as solvent for the analysis of residual solvents of ICH classes 1, 2 and 3.

Supplier: Merck

Ethanol absolute analytical reagent, reference substance for gas chromatography, Supelco®

Supplier: Merck

Purospher® STAR Phenyl HPLC columns show an enhanced selectivity compared to standard alkyl phases. They are the first alternative to RP-8 or RP-18 selectivities for separation of aromatic compounds, fatty acids, purines and pyrimidines due to π-π interactions. The new Purospher® STAR Phenyl columns are based on high purity silica particles providing symmetrical peaks for basic compounds, high stability and excellent reproducibility.

Supplier: Merck

Profenofos CRM may also be used as given below: Evaluation of 250 pesticide residues extracted by QuEChERS method from 103 processed fruit samples using ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS. Gas chromatography-tandem mass spectrometry (GC-MS/MS) based analysis of 213 pesticide residues in soybean after their extraction by QuEChERS procedure. Detection of 252 pesticides extracted from surface water samples by solid-phase extraction (SPE) using liquid chromatography quadrupole-orbitrap high-resolution tandem mass spectrometry. Multi-residue analysis of 160 multiclass pesticides using ethyl acetate (EtAC)/n. hexane mixture for extraction from chamomile thyme and marjoram samples and their analysis by gas chromatography-tandem mass spectrometry (GC-MS/MS). Simultaneous determination of 34 pesticides in various environmental water samples by dispersive liquid-liquid microextraction (DLLME) technique in combination with gas chromatography-mass spectrometry(GC-MS/MS). Quantitation of 40 multi-class insecticides and fungicides in 81 apple samples by using gas- and liquid- chromatography-mass following a QuEChERS-based extraction.

Supplier: Merck

TLC plates, unmodified silica gel 60
Merck silica gel 60 has a unique polymeric binder that results in a uniform, hard surface that will not easily crack or blister. This smooth, extremely dense plate coating ensures narrow bands and maximum separation efficiency with the lowest background noise. Layer thickness 250 μm and particle size of 10 to 12 µm. Two inorganic fluorescent indicators for UV detection of colourless substances.

Supplier: Merck

The selectivity offered by ZIC®-HILIC is suitable for a wide variety of molecules containing hydrophilic or ionisable functional groups. This includes compounds such as carbohydrates, metabolites, acids and bases, organic and inorganic ions, metal complexes, amino acids, peptides, protein digests, plant and cell extracts, plus much more. Such compounds are normally characterised by a small or negative LogP value and have poor retention on reversed-phase columns.

Supplier: Merck

Ascentis Express RP-Amide high-speed, high-performance liquid chromatography columns are based on Fused-Core® particle design. The fused core partical provides a thin porous shell of high-purity silica surrounding a solid silica core.

Supplier: Merck

2-Propanol, SupraSolv® for gas chromatography, Supelco®

Supplier: Merck

N-Methyl-2-pyrrolidone (NMP), SupraSolv® for headspace gas chromatography

Supplier: Merck

N-Methyl-2-pyrrolidone (NMP) ≥99.5% (by GC), LiChrosolv® for liquid chromatography, Supelco®