456 výsledků pro: "chromatography solvents"

Supplier: MACHEREY-NAGEL

The highly polymeric binder used for these sheets is stable in almost all organic solvents and resistant towards aggressive visualisation reagents. It is also completely stable in purely aqueous eluents.

Supplier: HAMILTON BONADUZ

The PRP-X100 is a polymeric column packing for separation of inorganic and organic anions from 10 to 500 ppm. These columns can be used to separate ions at concentrations from 1 to 1000 ppm without suppression or elaborate preconcentration techniques. The highly inert polymeric support resists chemical attack from organic solvents and aqueous buffers (0 - 100% aqueous or organic; pH 1 to 13), effectively lengthening column life.

Supplier: Agilent

The 4100/4200 Microwave plasma-atomic emission spectrometer runs entirely on air, which means your lab can eliminate flammable and expensive gases. It's safer and more cost efficient than other spectrometers. The 4100/4200 MP-AES enables superior detection and can perform unattended multi-element analyses.

Supplier: VARIAN

Hi-Plex HPLC columns deliver improved efficiency, lower operating pressures and longer column lifetimes from monodispersed materials. With a range of ligand counter ions for optimum selectivity and resolution and materials matched to the USP definitions of media types L17, L19, L34 and L58, the Hi-Plex range is ideal for isocratic separations using water or dilute acid as the eluent. This simplifies your HPLC system requirements and eliminates the use of potentially hazardous organic solvents.

Supplier: HAMILTON BONADUZ

These headspace syringes feature a unique Glue-Free (GF) needle attachment in combination with a High Dynamic (HD) plunger. They are designed specifically for PAL COMBI–xt® headspace autosamplers. Conventional headspace syringe needles are attached to the syringe glass body using glue (cement). Common problems are detached needles or ghost peaks due to low chemical inertness of the cement to solvents or limited resistance to higher temperature. These problems are addressed with the Glue Free High Temperature (HDHT) headspace syringes.

Supplier: Agilent

Step 1: Extraction
Choose the extraction salt packet based on your method of analysis, AOAC or EN. The buffered extraction salts are amenable for more liable pesticides. Adding solvent and then salts to a comminuted fruit or vegetable sample (10 g or 15 g) enables you to extract the pesticides of interest into the organic layer. However, adding a food sample with a high percentage of water directly to the salts may create an exothermic reaction that can affect your analyte recoveries.

Supplier: HAMILTON BONADUZ

A fast, versatile HPLC column packing material. These columns rapidly and easily separate closely related alcohols and organic acids without column heating. The sulfonated poly(styrene-divinylbenzene) support separates samples by a mixed mode mechanism. A wide range of samples can be analysed with these columns because the selectivity of the column can be altered by changing the pH of the buffer or adding an organic modifier (methanol, acetonitrile) to the buffer. The stability to organic solvents makes it possible to analyse samples that have been too highly retained on conventional ion exclusion supports.

Supplier: Resonac

A complete range of general purpose gel permeation columns (GPC) packed with tetrahydrofuran (THF). Columns packed with other solvents are also available. Please enquire for further details.

Supplier: Merck

Simazine CRM may also be used as given below: Development and validation of an ultrasonic-assisted dispersive liquid-liquid microextraction (UA-DLLME) method for sample extraction followed by gas chromatography-mass spectrometry based determination of endocrine-disrupting herbicides in the river and seawater samples. Determination of triazine pesticide residues in samples of apples pears carrots potatoes tomatoes avocado cucumber spinach bananas and oranges by modified QuEChERS and solid-phase extraction (SPE) procedures followed by liquid chromatography-photodiode array (LC-DAD) analysis. Multi-residue analysis of 67 pesticides in olive oil olives and avocado samples by liquid chromatography-tandem mass spectrometry (LC-MS/MS) to evaluate various clean-up sorbents. Quantitation of 20 pesticides in eel and shrimp samples by a scheduled multiple reaction monitoring (sMRM) method and QuEChERS with EDTA for sample extraction and purification. Analysis of 35 micropollutants including pesticides in water samples by liquid chromatography-tandem mass spectrometry (LC-MS/MS) after their solid-phase extraction. Simultaneous quantification of 58 pharmaceuticals and personal care products (PPCPs) and pesticides in water samples by solvent-based de-emulsification dispersive liquid-liquid microextraction (SD-DLLME) combined with liquid chromatography-tandem mass spectrometry (LCMS/MS).

Supplier: Resonac

SB-800 HQ are polyhydroxymethacrylate-based SEC columns for molecular weight distribution analysis of water-soluble polymers. The solvent can be substituted with DMF (except for SB-802 HQ and SB-807 HQ columns), enabling the analysis of polar polymers.

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

EXtrelut® NT is a specially processed, inert, wide pore kieselguhr with a high pore volume. It has been used for quite some time within research, for the sample preparation of urine, whole blood, plasma and other biological matrices. Other applications include environmental and residue testing such as analysis of industrial, domestic and wastewater. EXtrelut® NT is supplied either pre-packed in cartridges or as a loose sorbent. EXtrelut® NT simplifies liquid-liquid extraction by replacing separation funnels. Using a single step is more efficient, saves solvent, as well as material and time, in contrast to classic funnel separation. The aqueous sample is simply applied to the EXtrelut® NT sorbent. It distributes itself over the chemically-inert matrix so acting as a stationary phase. Subsequently, elution takes place using organic solvents that are non miscible with water. All the lipophilic substances are extracted from the aqueous into the organic phase.

Supplier: Merck

Chromolith® DIOL columns are useful as an intermediate polarity media between C18 and silica. Diol functionalised media is less polar and can have different selectivity. Chromolith® DIOL can be used with a wide range of solvents in both normal and reverse phases. In normal phase mode, the diol phase provides an alternative selectivity compared to silica whilst additionally demonstrating longer retention times that help to obtain separation. In reverse phase mode, compounds such as water-soluble vitamins, sugars or amino acids are easily baseline separated using simple mobile phases. Chromolith® DIOL columns have long lifetimes within pH range of 2,5 to 7,5, high matrix tolerance and speed of analysis.

Supplier: Spectrum Laboratories

Biotech RC (Regenerated Cellulose) dialysis tubing is crafted from a regeneration process that yields superior temperature tolerances and chemical compatibilities with the same high purity and selectivity as Biotech CE. RC membrane can tolerate concentrated-weak acids & bases, dilute-strong acids and bases, most alcohols and some mild or dilute organic solvents. Exposure to strong polar or organic solvents may damage RC membranes. Use with pH 2 - 12 and temperature 4 - 60 °C.

Supplier: CAMAG

These flat bottom chamber allow the chromatogram to be developed in a tank atmosphere of partial or complete saturation with solvent vapours. The degree of layer pre-saturation cannot be controlled unless additional accessories are used.

Supplier: Spectrum Laboratories

KrosFlo® hollow fibre membranes for implant technology provide a true-to-life response for drug screening and cancer research. Perfectly suited for implantation, the modified Polyvinylidene Difluoride (mPVDF) hollow fibre membrane is biocompatible, resistant to cell adhesion, hydrophobic and resistant to a wide variety of organic solvents, including most aqueous acids and bases. Furthermore, these hollow fibres can be heat sealed and autoclaved without affecting the molecular weight cut off (500 kDa MWCO) or changing the membrane performance.

Supplier: EDVOTEK

[EN]PLANT PIGMENT CHROMATOGRAPHY PHOTOSY 1 * 1 KIT

Supplier: BUCHI

Flash chromatography system

Supplier: BUCHI

Flash chromatography system

Supplier: Avantor

PTFE

Supplier: BUCHI

PURE chromatography systems for flash applications.

Supplier: BUCHI

C-900 PURE Essential chromatography pump system with flexible software control.

Supplier: Honeywell Chemicals

Rinsing solution I, CHROMASOLV™ LabReady™, Solvent Blend rinsing agent for LC-MS, Riedel-de Haën™

Supplier: Avantor

Precision bore PEEK tubing is designed specifically for modern LC, LCMS and automation usage.

Supplier: DWK Life Sciences

DURAN®, borosilicate glass 3.3, clear, with blue PP screw cap.

Supplier: Resonac

The GF-HQ series are designed for aqueous (GFC) and organic (GPC) size exclusion chromatography. High performance analysis of samples containing hydrophilic and hydrophobic parts, such as surfactants is possible.

Supplier: Agilent

Fits PerkinElmer and other headspace autosamplers.

Supplier: Trajan Scientific and Medical

Non deactivated fused silica capillary tubing.
Used in a wide range of capillary GC, HPLC and bioanalytical applications
Made from high quality fused silica
Tubing protected with a high temperature polyimide resin

Supplier: ROBU GLASFILTER

VitraPOR® chromatography columns are made of borosilicate glass 3.3. The versatile and recyclable material makes it suitable for the most diverse fields.

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.