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A blog on the latest applications, articles, & research on chromatography solutions in sample preparation, Ion Chromatography (IC),
High Pressure Liquid Chromatography (HPLC), Ion Chromatography-Mass Spectrometry (IC-MS), Gas Chromatography (GC),
Gas Chromatography-Mass Spectrometry (GC-MS and GC-MS/MS), and software (Chromeleon CDS, LIMS, and ProteinCenter).

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GC-MS/MS Speeds Analysis of 200 Pesticides in Ayurvedic Churna

  
  
  
  
  
  
analysis of ayurvedic medicines

In the fascinating application presented in this blog post, chemists from our Mumbai (India) and Singapore labs collaborated on the development of a fast and precise GC-MS/MS method for the routine determination of multi-residue pesticides in Indian Ayurvedic medicine churna, a blend of ground spices and herbs.

Gas Chromatography Does Wine Analysis!

  
  
  
  
  
  
pesticides in wine

When I received a link to this newstory, titled, From chardonnay to cabernet, malbec to merlot: What's in your wine? (link to article) featuring the analysis of pesticides and other contaminants in wine from one of our marketing communications specialists, my first question was: which of our instruments does the testing company use? Of course, we were pretty thrilled that one of our gas chromatography systems was used in the analysis.

Solid-Phase Extraction Cartridges with Polymeric Phases Now Available

  
  
  
  
  
  
chromatography sample preparation

Here, I am pleased to present a recently released line of polymer-based solid-phase extraction cartridges (Thermo Scientific Dionex SolEx Polymer-Based SPE cartridges) for the extraction of organic contaminants from liquid matrices. These cartridges are intended to be used for sample preparation using our solid-phase extraction (SPE) system (Thermo Scientific Dionex AutoTrace 280 SPE system) followed by GC, GC-MS or LC-MS analysis.

Gas Chromatography On-Demand Webinars for Pesticide Analysis

  
  
  
  
  
  
gc-ms pesticide residue analysis

Pesticides have been in my news radar lately with a couple of recent stories that caught my attention: in the first one, Canada has initiated special reviews on 23 pesticide active ingredients (link to story) and, in the second one, the U.S. EPA has awarded three universities USD500,000 for studies on reducing pesticide including risk to bees (link to story). And, yesterday, I received an email on three on-demand webinars on the use of gas chromatography in pesticide analysis that you can view without registering!

Accelerated Solvent Extraction & GC-MS Pesticide Analysis in Herbal Products

  
  
  
  
  
  
Pesticide Analysis in Herbal Products

Do you know that the herbal products market while huge--USD 62 Billion globally--has been not been regulated or the products tested in a similar manner to pharmaceutical products? Indeed, in a recent study, researchers found that 59% of herbal products tested in the study contained plant species not listed on the labels! (Link to Study).

GC-MS Screening Method for 600 Pesticides in Food Samples!

  
  
  
  
  
  
GC-MS methods for screening pesticides in food

I couldn't resist making the title of this blog post a bit dramatic to draw your attention to the fact that you could could screen for 600 pesticides using the GC-MS method featured in this blog post!

Accelerated Solvent Extraction Applied in Sediment Toxicity Research

  
  
  
  
  
  
pyrethroid sample preparationResearching the pesticide and the aquatic organism featured in the research study presented in this blog led to read some fascinating information on my part. Firstly, did you know that Hyalella azteca, a freshwater crustacean, is used in sediment toxicity studies and in gene expression studies in ecotoxicogenomics in the United States? (Link and source Wiki on arthopodgenomes). Secondly, pyrethroid pesticides, a focus of the research study, were developed as a synthetic version of the naturally-occurring pesticide pyrethrin, which is found in chrysanthemums.

The stunning photo of the H. azteca featured in this post is from the USDA ARS Public Domain.

In the study, researchers from the University of California, Berkeley, 10 populations of H. azteca were studied for neurotoxicity to pyrethroids via gene analysis. The study is titled, Multiple origins of pyrethroid insecticide resistance across the species complex of a nontarget aquatic crustacean, Hyalella azteca, (link to abstract; only the abstract is free) uses one of our Accelerated Solvent Extraction systems (Thermo Scientific Dionex ASE 200 Accelerated Solvent Extractor system) for preparing the sediment samples as per the requirements of U.S. EPA Method 3510C (downloadable PDF) for the extraction of organic compounds from aqueous samples followed by  gas chromatography analysis. Gene sequencing and gene expression analysis revealed the development of genetic resistance of H. azteca to the pesticide.

The scientists conclude: "The finding that a nontarget aquatic species has acquired resistance to pesticides used only on terrestrial pests is troubling evidence of the impact of chronic pesticide transport from land-based applications into aquatic systems."

The study was jointly conducted by researchers from the following U.S. universities: University of California at Berkeley, University of Massachusetts,  University of Oklahoma, Southern Illinois University, Purdue University, and Indiana University.

You can also downloadable this PDF showing a fast HPLC separation of nine pyrethrin isomers in less than 28 mins using one of our reversed-phase HPLC columns (Acclaim RSLC 120 C18 2.2 ┬Ám column).

Do check out the blog for more chromatography applications and research articles featuring the use of accelerated solvent extraction for sample preparation.

 













GC-MS Analysis of Dithiocarbamate Pesticides in Food Samples

  
  
  
  
  
  
gc ms pesticide analysis

I am pleased to share a recently released application note plus a recent webinar, now available on-demand, for the gas chromatography-mass spectrometry (GC-MS) analysis of pesticides in food.

HPLC Column: Improved Analysis for Wide Range of Surfactants

  
  
  
  
  
  
surfactant analysis

In this blog post, I am pleased to feature a newly released HPLC column that can be specifically used for the separation of anionic, cationic, nonionic, and amphoteric surfactants widely used in pesticides, detergent powders, petroleum products, cosmetics, and pharmaceuticals. This column provides a solution to two challenges: so far there has been no HPLC column specifically for the analysis of surfactants and the challenge of being able to separate anionic, nonionic, cationic and amphoteric surfactants in a single analysis!

GC and GC-MS: Concerned about Dirty Matrix Samples?

  
  
  
  
  
  
gas chromatography pesticide analysis

A recently released article on the title of this post is the genesis of this blog post. How this came about is as follows. Soon after the article, Application of the precolumn back-flush technology in pesticide residue analysis: A practical view, (link to abstract) was released, our APAC GC/MS Technical Director, Hans-Joachim Hubschmann, Ph.D., sent an email saying that this was an excellent read and recommended it. Immediately, I asked if he would provide his thoughts on the topic and he did! 

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