chromatograph Articles | Environmental XPRT

Top 16 for 2016 - Restek LC article makes the cut

If you are an avid chromatographer you likely subscribe to LC/GC magazine or its popular electronic version, E-Separation Solutions. It is definitely the place to go for news and information related to all things Chromatography. Over the years Restek has had many an article published in LC/GC and, full disclosure, we advertise there as well. Who in the business doesn’t? It is the place to ...

Jan. 10, 2017

By Restek Corporation

Complex Mixture Using Hydrogen as a Carrier Gas

The following technical brief aims to demonstrate the performance of GC-MS using hydrogen as a carrier gas. Here we compare the performance of hydrogen and helium for the analysis of a complex mixture. The results show that by using hydrogen, chromatographers can achieve superior results to helium, with faster run times and taller, sharper peaks. ...

Jul. 16, 2013

By Peak Scientific Instruments Ltd

Proposal for a deconvolution procedure for the gas chromatographic estimation of pristane and phytane in marine sediments

In this paper, a deconvolution procedure for improving the quantitative estimation of specific hydrocarbons by chromatographic techniques is reported. The proposed technique has been applied to the gas chromatographic determination of the pristane to phytane (pri/phy) ratio, an important parameter for the evaluation of biogenic and anthropogenic contributions present in the hydrocarbon content of ...

Feb. 3, 2009

By Inderscience Publishers

The investigation of compositional and structural characteristics of natural marine organic matter: a review

The natural marine Organic Matter (OM) is a complex mixture of carbohydrates, lipids and proteins present in seawater and sediments, able to affect many processes occurring in the marine environment such as the biochemical cycles of marine nutrients and living organisms. As the complexity of environmental studies concerning OM composition requires the application of accurate analytical methods, ...

May 22, 2008

By Inderscience Publishers

Waters HPLC & UHPLC Application Notes at Your Finger Tips

Summary A quick reference notebook to Waters HPLC/UHPLC application note highlights. 　 140 application notes covering a wide range of markets, such as Pharma, Food, and Health Science. Condensed one page format highlighting experimental conditions and chromatographic results. Tips on how to choose the best column to deliver throughput, resolution, and efficiency for your next ...

Sep. 26, 2017

By Waters Corporation

Flavor and Aroma Profile of Hops Using FET-Headspace on the Teledyne Tekmar Versa with GC/MS

Abstract To brewers and the brewing industry, hops is an important beer component because of the flavor and aromas imparted during the hops addition process. Consequently, anticipating and/or validating the flavor profile of a particular variety of hops, based on analytical techniques, has become an increasingly useful tool in the head brewer’s repertoire. Hops flavors and aromas are ...

Dec. 14, 2016

By Teledyne Tekmar

Separation of colors and scents from candle wax

Separation and detection and additives from scented candles While electric lighting has have largely replaced candles as a light source, they are still popular for decorative purposes. Originally from bees’ wax, modern candles are typically made from paraffin or stearin. Often, coloring and scents are added to candles. These additives can be separated from the candle wax by chromatography. ...

May 3, 2018

By BÜCHI Labortechnik AG

Radiolytic studies on some organic dyes in aqueous solutions

Radiolytic studies on four aqueous dye solutions were carried out. Colour bleaching of the dye solutions upon irradiation was followed by quantitative TLC. Spot comparison methods were used to determine the dependence of the Spot Area Weight (SAW) of the chromatographic spots on the spot content. A good linear relationship was obtained. The percentage changes of SAW values of the analysed dye ...

Mar. 25, 2008

By Inderscience Publishers

Petroleum/Chemicals Application Guide

This guide contains information about Supelco products and technology for performing detailed hydrocarbon analysis by chromatographic methods. Various applications are discussed; including, simulated distillation, polynuclear aromatic hydrocarbons, phenols / polymers, petrochemical analysis, high resolution and high speed analyses, and packed column applications. Columns used range from the ...

Dec. 31, 2004

By MilliporeSigma

Implication of an outer surface lipoprotein in adhesion of bifidobacterium bifidum to caco-2 cells

We found that the human intestinal isolate Bifidobacterium bifidum MIMBb75 strongly adhered to Caco-2 cells. Proteinase K and lithium chloride treatments showed that proteins play a key role in MIMBb75 adhesion to Caco-2 cells. By studying the cell wall-associated proteins, we identified a surface protein, which we labeled BopA. We purified the protein chromatographically and found that it ...

Aug. 1, 2008

By American Society for Microbiology (ASM)

Polyether antibiotics monensin, narasin, & salinomycin

Polyether antibiotics, such as Monensin, Narasin, and Salinomycin, in raw material, premix, liquid supplements, and final feeds, are best quantified using a high-performance liquid chromatograph equipped with a post-column reactor. The polyether antibiotics react, post-column, with Vanillin in the presence of Sulfuric acid, and the resulting products can be detected at 520 nm. However, this ...

Jun. 10, 2010

By Pickering Laboratories, Inc.

Analysis of Geosmin and 2-Methylisoborneol Utilizing the Stratum PTC and Aquatek 70

Abstract Geosmin and 2-Methylisoborneol are organic compounds that have a distinct scent. These compounds also have an extremely low odor detection threshold and because of this, many drinking water laboratories require detection levels of below 10ppt. This application note investigates the detection of Geosmin and 2-Methylisoborneol at a one part per trillion (ppt) level utilizing Purge and Trap ...

May 25, 2010

By Teledyne Tekmar

Semi-volatile organics in drinking water using EPA method 525.2 optimized for greater sensitivity

The US EPA Drinking Water Manual contains the methods used to identify and quantify regulated and unregulated organic drinking water contaminants. Included in this manual is Method 525.2, a Gas Chromatographic/ Mass Spectrophotometric (GC/MS) technique for the determination of semi-volatile organic compounds. Method 525.2 can be used for the identification and quantification of a group of ...

Oct. 28, 2011

By PerkinElmer, Inc.

Chromatography in Sugar Processing

Untitled Document Chromatography is a new process to most sugar technologists, yet it is fast becoming a tool of significance for recovering sucrose and other value by-products. The CSEP® chromatographic separator, one of the most modern SMB industrial concepts, is uniquely flexible and adaptable to all the challenges in the growing use of chromatography for ...

Sep. 1, 1999

By Calgon Carbon Corporation

Separation and identification of hormone-active compounds using a combination of chromatographic separation and yeast-based reporter assay

AbstractArxula adeninivorans-based yeast cell assays for the detection of steroid hormones demonstrated their efficiency for the determination of total hormone activity in a variety of samples using a microtiter plate format. In this study, a preliminary chromatographic separation using thin-layer chromatography plates is introduced in order to allow a rapid identification of the compounds ...

Dec. 15, 2017

By QuoData GmbH

Hydrogen Performance for Carrier Gas

Owing to the worldwide helium shortage, many labs are facing supply difficulties of helium, one of the most commonly used carrier gases and as a consequence are facing rapid price increases. Many chromatography labs are therefore looking for alternative carrier gases and for many GC applications, hydrogen provides a good, in some cases better, alternative to helium. The perceived danger of having ...

Jul. 2, 2014

By Peak Scientific Instruments Ltd

System Description for Monitoring Volatile Hydrocarbons

To help build a comprehensive Industrial Hygiene program, Buck Scientific introduces the IH910 vapor monitoring system utilizing our model 910 gas chromatograph and IH300 air sampling train. Designed to analyze hydrocarbons in air, such as degreasing solvents and paint vapors emitted during plant operations, the IH910 penetrates the 1mg/m3 detection barrier erected by other field portable ...

Jan. 1, 2006

By Buck Scientific Inc

Resolution in life and mass spectrometers? It really depends…

“How few there are who have courage enough to own their faults, or resolution enough to mend them.” Benjamin Franklin As I sat one morning before work staring into my green tea leaves at the bottom of my cup and reflecting on my resolutions achieved and resolutions that evaded me in 2015, I resolved to make 2016 a better year. The ‘missed’ resolutions outweighed the ...

Jan. 25, 2016

By Waters Corporation

An overview of post-column derivatization methods from a pharmaceutical applications perspective

High performance liquid chromatography (HPLC) is the technique of choice for separating analytes pursuant to their detection, identification, quantification and/or purification. Most organic substances, and certainly the majority of pharmaceuticals, are polar, nonvolatile or thermally labile molecules that are amenable to HPLC separation. Moreover, the availability of a large variety of LC column ...

Jun. 15, 2007

By Pickering Laboratories, Inc.

Accurate Characterization of Polymers and Additives in Personal Care Products and Packaging by Fast-Scanning IR

You can’t buy anything today without a package. Think about it. Blister packs, cellowraps, shrink wraps, barrier bags, vapor films, UV-blocking films, heat-blocking films, tinted plastics, filled polymers, biodegradable bags, structural plastics, laminated films, moisture barrier films ….. ad infinitum (literally). Industries that manufacture plastics or utilize plastics need to ...

Jan. 1, 2006

By Buck Scientific Inc

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