2452 Results for: "MACHEREY-NAGEL"

Supplier: MACHEREY-NAGEL

Silyl-271 will derivatise all hydroxyl groups in any position. Useful in multiderivatisation schemes involving hydroxyl or amine groups.

Supplier: MACHEREY-NAGEL

HMDS is weak TMS donor. If used as sole reagent, it is slow and not very effective. After addition of catalytic quantities (e.g., 1 %) of TMCS or as a mixture with TMCS it is a fast and quantitative reagent for trimethylsilylation of organic compounds.

Supplier: MACHEREY-NAGEL

Silylation reagent with recommended applications: carboxylic acids, alcohols, phenols, primary and secondary amines and amino acids.

Supplier: MACHEREY-NAGEL

Methylation with DMF-DMA can be applied for fatty acids, primary amines and partially amino acids forming N-dimethyl-aminomethylene amino acid methyl esters. DMF-DMA is a poor solvent, for this reason it is necessary to use a mixture of DMF-DMA with pyridine, THF, acetone (barbiturates) or another solvent.

Supplier: MACHEREY-NAGEL

Acylation with fluorinated bisacylamides is recommended for alcohols, primary and secondary amines as well as for thiols under mild, neutral conditions.

Supplier: MACHEREY-NAGEL

CHROMABOND® C2 is a dimethyl modified silica phase for SPE.

Supplier: MACHEREY-NAGEL

CHROMABOND® Na₂SO₄/Florisil® is a combination phase for SPE of hydrocarbons from water.

Supplier: MACHEREY-NAGEL

MN 85/220 is a thick glass fiber paper with high basis weight for the filtration of large volumes of liquids.

Supplier: MACHEREY-NAGEL

Vial insert, 0,30 ml, Glass, Clear, Ø×H: 6×40 mm, Conical bottom, Non sterile, Cap included: No

Supplier: MACHEREY-NAGEL

Unmodified HPTLC silica layers available as glass plates with or without fluorescent indicator. The narrow fractionation of the silica particles features theoretical plate heights, which are one order of magnitude smaller than on standard silica layers. Thus, Nano-ADAMANT has the advantage of sharper separations, shorter developing times, and increased detection sensitivity with equal selectivity.

Supplier: MACHEREY-NAGEL

This test paper allows the quick and easy detection of chromate (CrO_⁴^₃-). Cr(III) ions must be converted to Chromate prior to the detection.

Supplier: MACHEREY-NAGEL

Fluorescent indicators for thin layer chromatography.

Supplier: MACHEREY-NAGEL

CHROMABOND® HR-XC is a benzenesulfonic acid modified polymeric cation exchanger for SPE.

Supplier: MACHEREY-NAGEL

Special octadecyl modified silica phase for HPLC analysis of PAHs.

Supplier: MACHEREY-NAGEL

CHROMABOND® HR-XAW is a weakly basic secondary and tertiary ammonium polymeric anion exchanger for SPE.

Supplier: MACHEREY-NAGEL

Paper chromatography is the chromatographic technique separation due to partition of the analytes between special paper grades and the mobile phase, which penetrates the paper by capillary action ascending, descending and circular techniques are possible.

Supplier: MACHEREY-NAGEL

Photometric test kit for the determination of phenols in water samples.

Supplier: MACHEREY-NAGEL

CHROMABOND® CN/SiOH is a combination phase for SPE analysis of PAHs.

Supplier: MACHEREY-NAGEL

Septa, PTFE virginal, white, Hardness: 53° shore D, Thickness: 0,25 mm, Ø: 12 mm

Supplier: MACHEREY-NAGEL

Polar GC phase with optimized crosslinking for lower column bleeding and higher temperature stability

Supplier: MACHEREY-NAGEL

Semi-quantitative test strips for reliable determination of iron concentrations as low as 0.05 mg/L (ppm). A hole in the plastic carrier allows the water to migrate through the test pad increasing the sensitivity by a factor of nearly 10. Ideal for rapid and easy analysis of iron directly on-site. No maintenance or calibration is required.

Supplier: MACHEREY-NAGEL

Medium polar silarylene GC phase with low bleeding.

Supplier: MACHEREY-NAGEL

NUCLEODUR® PFP is a pentafluorophenyl-propyl modified silica phase for HPLC.

Supplier: MACHEREY-NAGEL

Medium polar silarylene GC phase with low bleeding.

Supplier: MACHEREY-NAGEL

VarioPrep (VP) guard column holders are needed for the installation of VP guard columns at VP preparative HPLC columns.

Supplier: MACHEREY-NAGEL

CHROMABOND® Carbon A is a special phase for SPE enrichment of acrylamide from water.

Supplier: MACHEREY-NAGEL

Rack for 2 electronic crimping tools

Supplier: MACHEREY-NAGEL

These papers are made hydrophobic (impermeable to water) by impregnation with a silicone. With the aid of these filters, water can be separated from water-immiscible organic solvents in an elegant manner, by means of a simple filtration.

Supplier: MACHEREY-NAGEL

A pre-dosed NANOCOLOR® tube test for photometric determination of sulphide in water.

Supplier: MACHEREY-NAGEL

Polar GC phase.