155 Results for: "merck indicators"

Supplier: Merck

This range of plates uses an optimised Merck silica gel 60 with a particle size of only 5 to 6 µm, which results in higher packing density and a smoother surface, therefore reducing band diffusion. Less sample is required, 0,1 to 0,5 µl than classic TLC.

Supplier: Merck

Sulphate standard solution, 1000 mg/L, Certipur®, Supelco®, Contents: Na₂SO₄ in H₂O, Application: Ion chromatography standards

Supplier: Merck

The LuxPlate® range of high fluorescence TLC plates contains an increased amount of fluorescent dye making it easier to identify small amounts of isolated material. Furthermore, the amount of binder added is elevated, resulting in a significantly brighter TLC plate with an even more stable and robust surface.

Supplier: Merck

Phosphate standard, Titrisol®, 1000 mg/l, Titrisol®, Supelco®, Contents: H₃PO₄ in water, Application: Ion chromatography standards

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

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

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

NH₄Cl in H₂O

Supplier: Merck

Chloride standard, concentrate Titrisol®, 1000 mg/l, Titrisol®, Supelco®, Matrix: H₂O, Contents: from HCl, Application: Ion chromatography standards, Analytical testing

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

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

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

Supplier: Merck

1,10-Phenanthroline hydrochloride monohydrate ≥99.5% (by anhydrous basis), GR Reag. Ph. Eur. for analysis, redox indicator, Supelco®

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: Merck

Glycerol is an aqueous mounting agent for preparation permanent slides of material of human origin or fluorescence microscopy. 100 ml are sufficient for approx. 200 - 300 applications. The mounting agent is an IVD registered product and CE certified, thus can be used for clinical diagnostic purposes.

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

OMI-1 INDICATOR TUBE 1 * 1 Each

Supplier: Merck

INDICATING DRYING CARTRIDGE,EA 1 * 1 Each

Supplier: Merck

OMI(R) Purifier Tube, OMI-4 Purifier Tube 1 * 1 Each

Supplier: Merck

STERILITY INDICATOR (STEAM STERILIZATION 1 * 25 Tests

Supplier: Merck

PM INDICATOR AGAR, FOR MICROBIOLOGY 1 * 500 g

Supplier: Merck

TLC Glass Plates from Merck KGaA, Darmstadt, Germany, L x W 5 cm x 10 cm, silica gel 60 matrix, binder, Polymeric, fluorescent indic ator 1 * 1 Each

Supplier: Merck

TLC AL SI60 F254 WITH INDICATOR 20X20CM 1 * 25 items

Supplier: Merck

CLICK-ON INDICATING TRIPLE HELIUM SPECIFIC PURIFIER 1 * 1 Each

Supplier: Merck

PHTHALATE ESTERS MIX AT INDICATED CONCEN TRATIONS IN ACETONE 1 * 4 mL

Supplier: Merck

TAPE, AUTOCLAVE INDICATOR, SIGMAWARE 1 * 1 items

Supplier: Merck

Silica Gel with Moisture Indicator (Orange Gel) Desiccant, approx. 2 - 5 mm 1 * 170 g

Supplier: Merck

HPTLC (High Performance TLC) Aluminum Sheets from Merck KGaA, Darmstadt, Germany, L x W 20 cm x 20 cm, silica gel 60 matrix, binder, Polymeric, fluorescent indicator: no 1 * 25 items

Supplier: Merck

TLC Aluminum Sheets from Merck KGaA, Darmstadt, Germany, L x W 20 cm x 20 cm, aluminum oxide matrix, binder, not applicable, fluores cent indicator 1 * 25 items