sample preparation techniqueThis blog has featured many applications and research articles demonstrating the advantages of using our accelerated solvent extraction for the extraction of solid and semisolid sample matrices using common solvents at elevated temperatures and pressures. And, hence, I am pleased to present our recently released moisture-absorbing polymer (Thermo Scientific Dionex ASE Prep MAP), a free-flowing white granular material, designed to remove moisture, disperse the sample matrix, and neutralize mineral acids in wet samples, such as soils, tissues, and food products.

The polymer offers the following advantages:

  • It is intended to be used with samples that contain volatile or semi-volatile components that could be lost if the sample is air dried or oven dried.
  • It has a high capacity for water removal and, thus, does not suffer from some of the limitations of clumping or precipitation observed in some of the traditional drying methods.
  • It can be used for in-cell extraction with no additional pre- or post- extraction steps.

For details on how to use this polymer and how it works with our accelerated solvent extraction systems, sample preparation procedures, and cleaning the sample preparation cell after the extraction, do view the Product Manual for Dionex ASE Prep MAP (downloadable PDF).

The following table shows an example of an in-cell moisture removal of oyster sample using Thermo Scientific Dionex ASE Prep MAP and ASE Prep DE, in comparison to sodium sulfate. The data has been provided by the Department of Toxicology, Texas Tech University, Lubbock. Note that in-cell drying with sodium sulfate is not recommended using the Dionex ASE system.

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Compound Recovery % Oyster dried with MAP and DE (n = 3) Recovery % Oyster dried with sodium sulfate (n = 3)
Lindane 91 81
Heptachlor 93 64
Aldrin 94 66
Dieldrin 105 75
Endrin 106 70
DDT 114 69
Total 101 71

The polymer should of interest to you if you are monitoring organochloro pesticides in seafood, polychlorinated biphenyls in wet soil and wet animal tissue samples, or total fat analysis in foods.

By the way, don’t forget to check other accelerated solvent extraction applications on this blog and you can also learn more about the ASE technique by watching this 1 hour on-demand webinar titled:Increase Productivity with Automated Sample Preparation, (link to webinar registration page).

Promotion on our ASE system: If you are looking to upgrade your existing Accelerated Solvent Extractor system (link to promotion), we are offering 15% off a purchase of a newThermo Scientific Dionex ASE 350 Accelerated Solvent Extractor system and up to 50% off a set of new stainless steel extraction cells.