196 Results for: "merck indicators"

Supplier: Merck

CN- and DIOL-modified silica plates are moderately polar that are suitable for both normal and reversed phase systems. The amino modified NH₂ plate provides weak basic ion exchange characteristics with special selectivity for charged compounds offering an alternative to PEI cellulose.

Supplier: Merck

HPTLC LiChrospher® plates are based on spherical-shaped silica 60 with a particle size of 7 µm, and narrow particle size distribution similar to the phases used in HPLC. LiChrospher® HPTLC plates possess a selectivity that is comparable to respective HPTLC plates, however, plate height and separation numbers are further improved resulting in shorter analysis times.

Supplier: Merck

Chloride standard, concentrate Titrisol®, 1000 mg/l, Titrisol®, Supelco®, Matrice: H₂O, Obsahy: from HCl, Aplikace: Standardy iontové chromatografie, Analytické testování

Supplier: Merck

Coupling TLC plates to mass spectrometry is a new field of high interest, which will contribute strongly to the progress of planar chromatography. The MS-grade plates are much cleaner than standard TLC/HPTLC plates providing higher sensitivity and reduced background signals. This allows trace analysis with mass spectrometry detection in lower nanogram range.

Supplier: Merck

NH₄Cl in H₂O

Supplier: Merck

Our NH₂, CN- and DIOL-modified silica sorbents are less polar then conventional silica phases, making them ideal for separating hydrophilic or charged substances. Our moderately polar cyano- and diol-modified silica plates can be used for both normal phase and reversed phase systems. An alternative to PEI cellulose, amino-modified NH₂ plates provide weak basic ion exchange characteristics with special selectivity for charged compounds.

Supplier: Merck

Methylene blue is a heterocyclic aromatic chemical compound used as a cationic dye. It is used as a redox indication in analytical chemistry. Methylene blue is a component of a number of staining protocols such as Wright′s stain and Jenner′s stain for microscopic evaluation.

Supplier: Merck

RP-2, RP-8 and RP-18 are based on silica gel 60 modified with aliphatic hydrocarbons. The chain length, in combination with the degree of modification, defines the ability to tolerate water in the solvent system and strongly affects retention. Migration time increases in the order RP-2, RP-8 and RP-18 using the same solvent composition. RP-8 and RP-18 can be run with up to 60% water in the solvent system.

Supplier: Merck

Titrisol® standards are traceable to standard reference material from NIST.

Supplier: Merck

1,10-Fenantrolin hydrochlorid monohydrát ≥99.5% (by anhydrous basis), GR Reag. Ph. Eur. for analysis, redox indicator, Supelco®

Supplier: Merck

Listeria monocytogenes is one of the most widely distributed foodborne pathogens in the world and is responsible for severe infections in immunocompromised persons, pregnant women and neonates. As a result, the mortality rate in infected individuals is high despite the relatively low number of cases around the world. Listeria infections (listeriosis) can result in anything from mild gastroenteritis to severe cases of sepsis, meningitis, encephalitis or abortion. Due to the ubiquitous distribution of Listeria and their capability to grow at refrigeration temperatures ( 2 to 8 °C), food products constitute one of the main sources of infection. Listeria is a genus of Gram-positive, non-sporeforming, rod-shaped bacteria. Of the six known species of the genus Listeria, Listeria monocytogenes deserves particular mention as a human and animal pathogen; L. ivanovii is only pathogenic in animals, while L. innocua, L. seeligeri, L. grayi, and L. welshimeri are considered harmless environmental bacteria. Consequently, food legislation in many countries specifies strict limits for Listeria spp. or Listeria monocytogenes. In the conduct of risk-related quality controls in food, tests should be run for L. monocytogenes, and for the Listeria Genus in general. The presence of Listeria – in particular of L. innocua – is an indicator for critical hygienic conditions in the production process. Innovative, rapid tests make screening for pathogenic organisms easier. The one-step format reduces the possibility of errors during handling.

Supplier: Merck

In addition to the traditional 5 g Kjeldahl tablets, which are added as catalysts to the digestion mixture, Merck Millipore can offer the 3,5 g tablet. This gives the flexibility needed to find the optimal setting for the catalyst/sulphuric acid ratio.

Supplier: Thermo Fisher Scientific

Natronové vápno indicator

Supplier: Thermo Fisher Scientific

Natronové vápno, with indicator

Supplier: Thermo Fisher Scientific

Natronové vápno ACS, with indicator

Supplier: Thermo Fisher Scientific

Síran vápenatý, Drierite™ 6 mesh for drying, with indicator (cobalt (II) chloride)

Supplier: Thermo Fisher Scientific

Škrob, rozpustný (from potato)

Supplier: Thermo Fisher Scientific

Fenolová červeň ACS

Supplier: Thermo Fisher Scientific

Methylová žluť indicator

Supplier: Thermo Fisher Scientific

Thymolphthalein ACS

Supplier: Thermo Fisher Scientific

Síran vápenatý, Drierite™ 6 mm (4 mesh) for drying, with indicator (cobalt (II) chloride)

Supplier: Thermo Fisher Scientific

Síran vápenatý, Drierite™ 3 mm (8 mesh) for drying, with indicator (cobalt (II) chloride)

Supplier: Thermo Fisher Scientific

Síran vápenatý, Drierite™ 10-20 mesh for drying, with indicator (cobalt (II) chloride)

Supplier: Merck

Organic Standard, Antioxidant Kit 2, 1 Kit

Supplier: Thermo Fisher Scientific

Kongo červeň indicator

Supplier: Thermo Fisher Scientific

1,10-Phenanthroline, anhydrous is used as a chelating agent, used as bidendate nitrogen ligands in Heck type reactions as an alternative to phospine ligands. It is widely used as an indicator for alkyllithium reagents and an inhibitor of metallopeptidase enzymes. It is also used in the analysis formulations in end-user industries like food, beverage and pharmaceuticals.

Supplier: Thermo Fisher Scientific

Cobalt(II) oxalate dihydrate, Reagent Grade

Supplier: Thermo Fisher Scientific

Škrob, rozpustný ACS for iodometric titrations

Supplier: Merck

Organic Standard, all-trans-Astaxanthin, ≥97%

Supplier: Thermo Fisher Scientific

Phenol red sodium salt ACS