498 Results for: "Mobile phases and phase modifiers"

Supplier: Merck

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

Supplier: Merck

N,O-Bis(trimethylsilyl)trifluoroacetamide ≥98.0% (by GC) derivatisation reagent, for gas chromatography, Supelco®

Supplier: Merck

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

Supplier: Merck

Purospher® STAR RP-8 endcapped, like Purospher® STAR RP-18 endcapped, is based on high purity silica and has an almost complete surface coverage. Thus, Purospher® STAR RP-8 provides excellent peak symmetry for acidic, basic and even chelating compounds, highest column efficiency in terms of the number of theoretical plates, and exceptional stability from pH 1,5 to 10,5. In addition, they are ideal for a wide range of applications. As the sorbent is less hydrophobic than Purospher® STAR RP-18 endcapped, analytes will typically elute faster on the C8 phase. Purospher® STAR RP-8 endcapped provides enhanced selectivity for positional isomers and symmetrical peak shapes for strongly basic and less hydrophobic compounds.

Supplier: Merck

Silicone oil AS 100 is a viscous liquid used to study the compatibility of segmenting fluids for two phase flow applications in biomedical microdevices.

Supplier: Merck

Silicon nitride predominantly β-phase ≤10 µm, Sigma-Aldrich®

Supplier: Merck

Bromelain from pineapple stem has been used to evaluate the aqueous micellar two-phase systems composed of ionic liquids as co-surfactants, as a positive control in sodium dodecyl sulfate (SDS) / polyacrylamide gel electrophoresis (PAGE) and in cells proliferation assay, to study its potential analgesic effect and to evaluate its hydrolysing effects on proenkephalin (PENK)-derived peptides containing enkephalin sequences.

Supplier: Merck

Ethyl 4-hydroxybenzoate (ethylparaben) was used to study the in-situ derivatisation solid-phase microextraction procedure for determining parabens, related chlorophenols, and triclosan in water[1].

Supplier: Merck

SupraSolv® ECD and FID is specially developed for gas chromatography in combination with ECD (Electron Capture Detetor) and FID (Flame Ionisation detector). SupraSolv® solvents offer the largest specified retention time range, a clear baseline and a minimal signal-to-noise ratio leading to reliable and reproducible analysis results.

Supplier: Merck

SupraSolv® solvents for headspace gas chromatography are developed particularly for the analysis of residual
solvents in drug substances, excipients and drug products according to ICH, Ph. Eur. and USP - SupraSolv® headspace solvents are tested for all residual solvents defined by the ICH.

Supplier: Merck

With their high degree of UV transmittance, low particle count, low acidity and alkalinity and low evaporation residue level, LiChrosolv® solvents are ideal for reproducible separations. Since separations are normally carried out under gradient conditions in analytical HPLC, we offer solvents in 'gradient grade' as well as 'isocratic grade'. This minimises the gradient effect of the solvent involved.

Supplier: Merck

With their high degree of UV transmittance, low particle count, low acidity and alkalinity and low evaporation residue level, LiChrosolv® solvents are ideal for reproducible separations. Since separations are normally carried out under gradient conditions in analytical HPLC, we offer solvents in "gradient grade" as well as "isocratic grade". This enables to minimize the gradient effect of the solvent involved.

Supplier: Merck

Sodium methoxide may be used as a derivatisation reagent to enhance the sensitivity of detection for the subsequent determination of organonitrogen herbicides and fungicide analytes in food samples, and bound fatty acids from acylglycerols, alkylacylglycerols, galactosyldiacylglycerols, glycerophospholipids, and sterol esters by gas chromatography (GC) based techniques.

Supplier: Merck

With their high degree of UV transmittance, low particle count, low acidity and alkalinity and low evaporation residue level, LiChrosolv® solvents are ideal for reproducible separations. Since separations are normally carried out under gradient conditions in analytical HPLC, we offer solvents in "gradient grade" as well as "isocratic grade". This enables to minimize the gradient effect of the solvent involved.

Supplier: Merck

With their high degree of UV transmittance, low particle count, low acidity and alkalinity and low evaporation residue level, LiChrosolv® solvents are ideal for reproducible separations. Since separations are normally carried out under gradient conditions in analytical HPLC, we offer solvents in "gradient grade" as well as "isocratic grade". This enables to minimize the gradient effect of the solvent involved.

Supplier: Merck

With their high degree of UV transmittance, low particle count, low acidity and alkalinity and low evaporation residue level, LiChrosolv® solvents are ideal for reproducible separations. Since separations are normally carried out under gradient conditions in analytical HPLC, we offer solvents in "gradient grade" as well as "isocratic grade". This enables to minimize the gradient effect of the solvent involved.

Supplier: Merck

With their high degree of UV transmittance, low particle count, low acidity and alkalinity and low evaporation residue level, LiChrosolv® solvents are ideal for reproducible separations. Since separations are normally carried out under gradient conditions in analytical HPLC, we offer solvents in 'gradient grade' as well as 'isocratic grade'. This minimises the gradient effect of the solvent involved.

Supplier: Merck

Reference substances can be used for the identification of unknown compounds in a gas chromatogram or as standards in quantitative GC analysis. They serve also for the characterisation of GC column properties.

Supplier: Merck

Highly robust plates with gypsum as binder, fully compliant with international pharmacopoeia (Ph. Eur. and USP).

Supplier: Merck

With their high degree of UV transmittance, low particle count, low acidity and alkalinity and low evaporation residue level, LiChrosolv® solvents are ideal for reproducible separations. Since separations are normally carried out under gradient conditions in analytical HPLC, we offer solvents in "gradient grade" as well as "isocratic grade". This enables to minimize the gradient effect of the solvent involved.

Supplier: Merck

Kieselguhr is a natural diatomaceous earth that can be used for the separation of polar or moderately polar compounds. For the mixed layer plates a combination of classical silica gel 60 and kieselguhr is used, providing favorable properties for certain applications such as separations of inorganic ions, herbicides or steroids.

Supplier: Merck

Magnesium matrix modifier for graphite furnace AAS.

Supplier: Merck

Used to detect mycobacteria (AFB hot staining)

Supplier: Merck

Haematoxylin solution modified acc. to Gill III

Supplier: Merck

Palladium matrix modifier for graphite furnace AAS.

Supplier: Merck

Szczepanik's standard cytological stain with modified solutions (CYTOCOLOR®) is chiefly used for early recognition of female genital carcinoma.

Supplier: Merck

This medium is recommended for total heterotrophic microorganism detection in water and other liquid samples.

Supplier: Merck

The mobile and robust Spectroquant® Move Cl₂/O₃/ClO₂/CyA/pH colorimeter covers five key important parameters for disinfection control (mainly Food and Beverage segment).

Supplier: Merck

Hematoxylin solution modified acc. to Gill II

Supplier: Merck

With their high degree of UV transmittance, low particle count, low acidity and alkalinity and low evaporation residue level, LiChrosolv® solvents are ideal for reproducible separations. Since separations are normally carried out under gradient conditions in analytical HPLC, we offer solvents in gradient grade; as well as isocratic grade. This enables to minimise the gradient effect of the solvent involved.