749 Results for: "Mobile phases and phase modifiers"

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

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

Supplier: Merck

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

Supplier: Merck

Nb₂AlC MAX phase is the precursor to revolutionary Nb2CTx MXene applications.
Technical prowess: Electrical conductivity: Nb2AlC serves as the precursor for Nb₂CTx MXene, showcasing remarkable electrical conductivity of 3,5×10⁴ S/cm.
Thermal conductivity: A thermal conductivity of 37,8 W/m·K ensures efficient heat dissipation, crucial for various engineering applications.
Hardness: With a vickers hardness of approximately 14,3 GPa, Nb₂AlC promises durability and resistance to wear.
Temperature stability: Operating at temperatures exceeding 1000 °C, Nb₂AlC finds applications in high-temperature environments like thermal barriers and heat exchangers.

Supplier: Merck

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

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

MAX phases are a family of ternary carbides and nitrides that share a similar layered hexagonal crystal structure. They are so called because of their chemical formula: M(n+1)AXn where n = 1, 2, or 3, where M is an early transition metal, A is an element from the IIIA or IVA groups, and X is carbon and/or nitrogen class of materials. MAX phases combine attractive properties of both ceramics and metals, and has been suggested for potential applications in nuclear reactor. The specific activities of Ti₃AlC₂ and Ti₂AlC were found to be similar to SiC, and are three orders of magnitude less than Alloy 617 after 10 to 60 years decay for all three activation times in both the fast and thermal spectra.

Supplier: Merck

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

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

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

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

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

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

AmberChrom™ 1X8 50-100 MESH (CL-) Anion is a strongly basic anion exchange resin which is used as an absorbent in solid phase 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

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

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 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

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

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

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

Palladium matrix modifier for graphite furnace AAS.

Supplier: Merck

Ammonium dihydrogen phosphate 100 g/l in water modifier phosphate modifier for graphite furnace AAS, Supelco®

Supplier: Merck

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