347 Results for: "Mobile phases and phase modifiers"

Supplier: Merck

Triclosan-methyl has been used as antimicrobial agent in assay as positive controls in the isolation and identification of active antimicrobial compounds from E. linza algae extract, which was analysed using reversed phase high performance liquid chromatography method (RP-HPLC) and gas chromatography method (GC) coupled with mass spectroscopy, and further confirmed by nuclear magnetic resonance studies (NMR).

Supplier: Merck

The LC-ABZ phase has a unique deactivation technology which provides excellent reversed-phase performance for basic compounds, as well as those that are acidic, polar neutral, and non-polar.

Supplier: Merck

TLC plates, unmodified silica gel 60
This range of plates uses Merck silica gel 60 with a unique polymeric binder that results in a uniform, hard surface that will not easily crack or blister. The smooth, extremely dense plate coating ensures narrow bands and maximum separation efficiency with the lowest background noise. Layer thickness 200 μm and, particle size of 10 to 12 µm. Flexible aluminium plates that can easily be cut to match individual separation requirements. Two inorganic fluorescent indicators for UV detection of colourless substances. Samples which absorb shortwave UV at 254 nm are detected due to fluorescence quenching.

Supplier: Merck

These bonded poly(5% diphenyl/95% dimethylsiloxane) low phenyl content columns improve thermal stability of the phase, while still providing essentially a boiling point elution order, and a slight increase in selectivity, especially for aromatic compounds.

Supplier: Merck

Bisphenol E may be used as a reference standard in the determination of bisphenol E in beverages using on-line solid-phase extraction with fast liquid chromatography coupled with tandem mass spectrometry (on-line SPE fast LC-MS/MS).

Supplier: Merck

Ascentis^® Express ES-C18 is a non-endcapped C18 stationary phase based on the proven Fused-Core^® particle design.

Supplier: Merck

Ascentis® Express PAH is a non endcapped C18 bonded phase with a proprietary manufacturing process designed on proven Fused-Core® technology to provide a fast and efficient separation of PAH compounds.

Supplier: Merck

BIOshell™ 160 Å Peptide CN columns provide an alternative selectivity to the traditional C18 bonded phases.

Supplier: Merck

Ascentis® Silica HPLC columns for the classic use in normal phase HPLC.

Supplier: Merck

Solid phase extraction vacuum manifolds allow to simultaneously process up to 12 or up to 24 SPE tubes. Precise flow control is provided through each SPE tube by rotating the independent, screw-type valves in the cover, this ensures the packing will not dry out in some tubes while others finish draining.

Supplier: Merck

Discovery® BIO Wide Pore reversed-phase columns satisfy the need for efficiency, selectivity, scalability, and reproducibility for RP HPLC analyses of proteins, peptides, and small biomolecules.

Supplier: Merck

This column with bonded poly(ethylene glycol) phase allows highly reproducible analyses of fatty acid methyl esters (FAMEs), specifically the omega 3 and omega 6 fatty acids. It is tested to ensure reproducible FAME equivalent chain length (ECL) values and resolution of key components.

Supplier: Merck

Clear, colorless fluid polymer useful as a stationary phase in gas chromatography and as an anti-foaming agent.

Supplier: Merck

Water, SupraSolv® for gas chromatography, Supelco®

Supplier: Merck

All the individual steps associated with solid phase extraction can be carried out using the LiChrolut® extraction unit. This transparent and vacuum-suitable unit, made of glass, can be used to prepare up to 12 samples simultaneously.

Supplier: Merck

This Reversed phase Supelclean™ ENVI-18 are suitable for excellent for cleaning, extracting and concentrating pollutants from aqueous environmental sample (drinking, ground, waste water). Also suitable for extracting herbicides, fungicides and pesticides from waste material.

Supplier: Merck

Discovery® BIO Wide Pore reversed-phase columns satisfy the need for efficiency, selectivity, scalability, and reproducibility for RP HPLC analyses of proteins, peptides, and small biomolecules.

Supplier: Merck

Metrafenone CRM may also be used in the residue analysis of: 209 pesticides and persistent organic pollutants (POPs) extracted by QuEChERS-based procedure from fresh bovine and chicken liver samples using gas chromatography coupled to tandem mass spectrometry (GC-MS/MS). 252 pesticides extracted from surface water samples by solid-phase extraction (SPE) using liquid chromatography quadrupole-orbitrap high-resolution tandem mass spectrometry. 250 pesticide residues extracted by QuEChERS method from 103 processed fruit samples using ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). 379 pesticides in human serum samples extracted by QuEChERS method using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Metrafenone in nine fresh vegetable samples using matrix solid-phase dispersion (MSPD) and HPLC-UV. Metrafenone in bitter gourd and soil samples using gas chromatography combined with an electron capture detector (GC-ECD).

Supplier: Merck

, LiChrosolv® for liquid chromatography, Supelco®

Supplier: Merck

Chromolith® Phenyl HPLC columns offer greater selectivity towards aromatic ring-containing compounds than standard alkyl phases. These columns are ideal for the separation of aromatic compounds, flavonoids, fatty acids, PAH, preservatives, purines and pyrimidines.

Supplier: Merck

Ethylbenzene reference substance for gas chromatography, Supelco®

Supplier: Merck

Discovery® BIO Wide Pore reversed-phase columns satisfy the need for efficiency, selectivity, scalability, and reproducibility for RP HPLC analyses of proteins, peptides, and small biomolecules.

Supplier: Merck

Purospher® STAR HPLC columns based on highest purity silica are also available for normal phase separations.

Supplier: Merck

If your waste samples contain non-volatile or semi-volatile substances or metals, use this hazardous waste filtration system for saparation, extratction, and filtration. Developed in collaboration with the US Environmental Protection Agency (EPA), the system is designed specifically for the US EPA Extraction Procedure (EP) Toxicity Test and Toxicity Characteristic Leaching Procedure (TCLP). The device separates solid and liquid phases of waste samples for analysis.

Supplier: Merck

Silicone oil 550 for gas chromatography, Supelco®

Supplier: Merck

Chromolith® Prep monolithic stationary phases are new ultrapure silica phases which gain their special properties from a bimodal pore structure. This structure is a property of the new 'Sol-Gel' technology and consists of macropores and mesopores. The mesopores with an average diameter of 12 nm, form the fine porous structure of the column interior and create a very large surface area on which adsorption of the target compounds occurs.

Supplier: Merck

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

Supplier: Merck

N,N-Dimethylformamide, SupraSolv® for gas chromatography, Supelco®

Supplier: Merck

These are ionic liquid GC columns. They offer a great choice for analysis of neutral and polarisable (contain double and/or triple C-C bonds) analytes.

Supplier: Merck

LiChrolut® solid phase extraction (SPE) cartridges and accessories are manufactured to the highest standards. All SPE cartridges listed below are polypropylene unless otherwise stated. They are compatible with all automated SPE instruments and robots. Three important criteria are carefully controlled.