ms columns Articles

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Rxi-624Sil MS Exceptionally Inert, Low Bleed Columns for Volatiles Analysis

by Restek Corporation  (May 24, 2012)

- Optimized selectivity for volatiles and polar compounds ensures good separations. - Highly inert columns improve accuracy and allow lower detection limits, even for active compounds. - Most thermally stable 624 column available; low bleed, fully MS compatible. While mid polarity 624 columns are widely used for analyzing polar analytes and ...

LC/MS/MS analysis of metabolites of synthetic Cannabinoids JWH-018 and JWH-073 in Urine

by Restek Corporation  (May 24, 2012)

Abstract A liquid chromatographic method was developed to resolve a comprehensive set of metabolites of JWH-018 and JWH-073. In addition to the chromatographic analysis method, an extraction method was developed to recover a broad range of synthetic cannabinoid metabolites, including carboxylic acid metabolites that are not traditionally recovered ...

Lower Detection Limits with Ground-Breaking Column Technology

by Restek Corporation  (May 24, 2012)

Rxi technology unifies outstanding inertness, low bleed, and high reproducibility into a single high performance column line. Take variation out of the equation and get the most consistent results for trace-level analysis with Rxi columns. phases available Rxi-1ms Rxi-1HT Rxi-5ms Rxi-5Sil MS Rxi-5HT Rxi-XLB ...

2.1 mm ID micro carbamates column ideal for LC-MS confirmation

by Pickering Laboratories, Inc.  (Jun. 10, 2010)

Post-column derivatization of carbamates with hydroxide and OPA is the method of choice for the detection of carbamates because of its high selectivity and high sensitivity (US EPA 531.1 & AOAC 985.23).  To confirm the finding of carbamates in the tested samples, there are various possibilitites: To confirm the finding of carbamates in ...

GC-MS Analysis of Polychlorinated Dibenzodioxins and Polychlorinated Dibenzofurans

by Sigma-Aldrich/Supelco  (Jun. 5, 2012)

Polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) consist of 210 different compounds with varying degrees of toxicity, and the 17 congeners with chlorine substitution in the 2,3,7,8 positions are considered the most toxic. This chromatogram illustrates the separation of a 17 component 2,3,7,8-substituted PCDD and ...

Aflatoxin & ochratoxin sample preparation columns

by Pickering Laboratories, Inc.  (Jun. 10, 2010)

Simultaneous Analysis of Aflatoxins and Ochratoxin A - Sample Preparation Aflatoxins and Ochratoxin A are produced by fungi, e.g. Aspergillus and Penicillium species. Therefore both toxin types are found together in many foods and animal feeds, e.g. cereals. Thus it is appropriate to analyze one extract for the occurrence of both mycotoxins in a ...

Advances in Bromine Speciation by HPLC/ICP-MS

by PerkinElmer, Inc.  (Oct. 28, 2011)

Bromine is a natural component found in waters, most commonly as the bromide ion, Br-. A common procedure for purifying drinking waters is treatment with ozone to kill bacteria. A byproduct of ozonolysis is the conversion of bromide to bromate (BrO3-), a known carcinogen. Therefore, a need exists to measure both bromide and bromate in drinking ...

Analysis of Organophosphorus and Organonitrogen herbicides in water using GC/MS with selected ion recording

by PerkinElmer, Inc.  (Oct. 28, 2011)

Laboratories monitoring trace level pesticides and herbicides by gas chromatography/mass spectrometry (GC/MS) frequently utilize Selected Ion Recording (SIR) techniques to maximize analytical sensitivity for quantification. With analytical standards, precision is limited to a large extent only by the autosampler and other instrumental effects. ...

Application of a GPC-LC-MS/MS method for the determination of 31 mycotoxins in edible oils

by Pickering Laboratories, Inc.  (Jun. 10, 2010)

Gel Permeation Chromatography (GPC) is widely used for sample clean up in mycotoxin analysis. The most commonly described methods use GPC columns packed with SX-3 BioBeads suitable for cleaning Zearalenone, Aflatoxins and Trichothesenes from edible oils and fatty matrices. Separation of Fumonisins from the oil fraction are inadequate with this ...

Analysis of US EPA Method 8270D Semivolatiles Using a 30 m x 0.25 mm I.D., 0.50 μm SLB-5ms

by Sigma-Aldrich/Supelco  (Nov. 5, 2012)

Application Note 401: US EPA Method 8270D specifies a procedure for the determination of semivolatiles in solid waste and ground water samples. The long list of analytes includes compounds of a variety of functionalities. A 0.25 μm df column is commonly used for this method, as it will allow for a short analysis time. However, the thin phase ...

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