1096 Results for: "HPLC Solvents"

Supplier: Aladdin Scientific

Boc-L-cysteine (Boc-Cys-OH) is a high performance liquid chromatography (HPLC) grade chromatographic solventBoc-L-cysteine (Boc-Cys-OH) can may be used as a chromatographic solvent, in an experimental study done to study the biosynthesis of S-(3-hexan-1-ol)-glutathione (3MH-S-glut) and S-(3-hexan-l-ol)-L-cysteine (3MH-S-cys), which act as flavour precursors in wines, in Vitis vinifera grapes exposed to various environmental stress.

Supplier: Aladdin Scientific

Boc-L-cysteine (Boc-Cys-OH) is a high performance liquid chromatography (HPLC) grade chromatographic solventBoc-L-cysteine (Boc-Cys-OH) can may be used as a chromatographic solvent, in an experimental study done to study the biosynthesis of S-(3-hexan-1-ol)-glutathione (3 MH-S-glut) and S-(3-hexan-l-ol)-L-cysteine (3 MH-S-cys), which act as flavour precursors in wines, in Vitis vinifera grapes exposed to various environmental stress.

Supplier: CP Lab Safety

2-Port safety cap deluxe kit, GL45 thread, black outer, ready-to-use with air inlet valve and and ¹/₈" OD tubing adapter. All you need to supply is the ¹/₈" OD tubing and you're ready to work! Create a closed system with GL-45 safety port caps, which seal to a bottle with a secure EPDM O-ring resistant to common HPLC solvents. This cap helps avoid twisted tubing due to its free-spinning collar design. The inner PTFE section will not rotate after the cap is secured. For a closed system, use the adapter with ¹/₈" OD tubing to seal one port and a vent filter in the other to allow for pressure changes and off-gassing.

Supplier: Adipogen

It is known that phenol and p-cresol are promoters of skin tumors and also urinary excretion of phenol and p-cresol is increased by exposure to benzene, which has hemopoietic toxicity, and toluene, respectively. Therefore, the determination of phenol and p-cresol is important in clinical chemistry and toxicology. Because phenol and p-cresol are present in urine as sulfate or glucuronide conjugates, they are hydrolyzed enzymatically or with acid, followed by distillation or extraction with organic solvent prior to measurement by GC or HPLC. However, these GC and HPLC methods require relatively large sample volumes (more than 1 ml) because of their insufficient sensitivities for measuring small amounts of phenol and p-cresol. In the general, the application of fluorescent labeling techniques to HPLC result in a sensitive and selective method. Some acyl chlorides are known to react with phenolic hydroxy group to form esters. It is known that 4-(N-phthalimidinyl)benzensulfonyl chloride Phisyl-Cl7, having sulfonyl chloride, reacted with phenol to give the corresponding highly fluorescent sulfonyl ester. The sensitivity of Physil-Cl was compared with Dansyl-Cl and DPS-Cl, which are analogous to Physil-Cl as fluorescent labeling reagents having sulfonyl chloride group. The labeling reaction of phenol with Dansyl-Cl and DPS-Cl were carried out according to the method of Ruiter et al.5 and the peaks were detected at the each fluorescence maxima wavelength (Ex350nm a Em550nm for Dansyl-Cl, and Ex320nm a Em386nm for DPS-Cl). Peak height of Phisyl derivative was higher about 85-and 7,3-fold than thosse of Dansyl derivative and DPS derivative, respectively. Among these three reagents, Phisyl-Cl was the most sensitive.

Supplier: SPEX CERTIPREP LLC

Consumer Safety Standards
Analytical Standards for Wine

Wine is a complex combination of water, alcohol and other substances such as organic acids, phenols, sugars, carbon dioxide, and sulfur dioxide. The chemical interactions of these compounds, combined with the aging process, determine the quality of the color, taste and aroma of the wine. However, during this process, the chemical interactions can also play key roles in spoiling the wine. For instance, cork taint transpires when naturally occurring airborne fungi are in the presence of chlorophenol compounds to form 2,4,6-trichloranisole (TCA) in the wine. When this occurs, the wine’s aroma is reduced significantly and is replaced by an undesirable smell and taste.

To help regulate the spoilage of wine, the wine industry tests for several compounds that are known to cause this. For this industry, SPEX CertiPrep offers Certified Reference Materials (CRMs) for wine that are designed for GC, GC/MS, HPLC and LC/MS analysis. These standards are manufactured from the highest purity starting materials and the highest grade of solvents available in order to guarantee superior quality. Each standard is supplied with a detailed comprehensive Certificate of Analysis.

Supplier: VWR International

DPTMDS deactivated fused silica retention gap/precolumn. General purpose deactivation for both apolar and polar solvents.

Supplier: VWR International

Application specifc columns developed for complex solvents mixtures analysis. HI-SOLVE 1 is ideal for aromatics and oxygenates in gasoline.

Supplier: VWR International

Application specifc columns developed for complex solvents mixtures analysis. HI-SOLVE 2 is ideal for aromatics and oxygenates in gasoline.

Supplier: VWR International

HMDS deactivated fused silica retention gap / precolumn. Deactivation mainly for apolar solvents.

Supplier: VWR International

CW deactivated fused silica retention gap / precolumn. Deactivation mainly for polar solvents.

Supplier: VWR International

General purpose column for solvent impurities, PCBs, hydrocarbons, essential oils, semivolatiles, allergens, pesticides, and so on.

Supplier: VWR International

General purpose low-to-mid-polarity phase for a wide range of applications, including (for example): Residual solvents, volatile pollutants.

Supplier: VWR International

Apolar phase, suitable for high flm thickness columns, to analyze solvents, alcohols, volatiles, and so on.

Supplier: VWR International

Apolar phase, suitable for high flm thickness columns, to analyze solvents, alcohols, volatiles, and so on.

Supplier: VWR International

General purpose column for solvent impurities, PCBs, hydrocarbons, essential oils, semivolatiles, triglycerides, pesticides, poly-waxes, and so on.

Supplier: Avantor

PEEK (polyetheretherketone) polymer tubing is biocompatible and chemically inert to most solvents. It is completely flexible, can easily be cut to desired lengths and is suitable for a wide range of applications.

Supplier: VWR International

General purpose GC-MS column Solvent impurities, PCBs, SimDist, drugs, natural gases, essential oils, semivolatiles, pesticides, phenols, etc.

Supplier: VWR International

General purpose column with added temperature stability. For the analysis of solvent impurities, PCBs, hydrocarbons, essential oils, semivolatiles, pesticides, phenols and more.

Supplier: VWR International

General purpose GC-MS column with extra stability. For the analysis of solvent impurities, PCBs, hydrocarbons, essential oils, semivolatiles, pesticides, phenols, etc.

Supplier: VWR International

n-Heptane ≥99%, HiPerSolv CHROMANORM for HPLC, VWR Chemicals BDH®

Supplier: VWR International

General purpose low-to-mid-polarity phase for a wide range of applications, including (for example): Residual solvents, volatile pollutants. HI-624 MS is an MS grade crossbonded column.

Supplier: VWR International

Application specifc columns for volatile organic compounds (VOCs), solvents and purgeable compounds. Due to the high max. temperature, they are ideal for two-parallel columns confg. in the same oven. A good alternative to the HI-624 giving different selectivity. It is a more robust than the HI-624 and can operate at higher temperatures.

Supplier: Optimize

Biocompatible and chemically inert to most commonly-used solvents tubing.

Supplier: TCI America

CAS Number: 1229-55-6 MDL Number: MFCD00046377 Molecular Formula: C17H14N2O2 Molecular Weight: 278.31 Purity/Analysis Method: 95.0% (HPLC) Form: Crystal Melting point (°C): 179

Supplier: MicroSolv Technology Corp

These mobile phase delivery bottles are a low cost option for solvent bottles made from Type-33 borosilicate glass.

Supplier: VWR International

Application specifc columns for volatile organic compounds (VOCs), solvents and purgeable compounds. Due to the high maximum temperature, they are ideal for two-parallel columns confg. in the same oven. A good alternative to the HI-624 giving different selectivity. It is a more robust than the HI-624 and can operate at higher temperatures.

Supplier: VWR International

Foxx's replacement fittings and plugs provide the closed system necessary to precent spills during HPLC liquid waste disposal. They are available in a variety of sizes and pack quantities.

Supplier: DWK Life Sciences (KIMBLE)

Designed for preparation, storage and delivery of all liquid chromatography mobile phases. As part of our ULTRA-WARE® series, these reservoirs are recommended for use under vacuum for filtration and vacuum degassing of mobile phase solvents.

Supplier: AGILENT TECHNOLOGIES, INC (CSD)

PolarGel GPC columns are designed for use with polar organic solvents and water/organic mixtures.

Supplier: Restek

General-purpose columns for solvents, Freon® fluorocarbons, alcohols, ketones, silanes, and glycols.