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Shodex Column Selection for Sugar Analysis in Algal Extracellular Polymeric Substances (EPS)

Record: 538

Category: Column Selection
Product: SUGAR series
Sample: xylose, fucose, and arabinose, and glucuronic acid

Question

A customer would like to analyze extracellular polymeric substance (EPS) secreted by green algae. The EPS fraction is collected from the supernatant after centrifugation and can also be lyophilized into a dried material. Previous GC/MS analysis showed the presence of neutral sugars such as xylose, fucose, and arabinose, as well as glucuronic acid.

What Shodex column can be recommended for HPLC analysis?

Answer

Column selection depends on whether the customer wants to analyze the intact EPS polymer or the monosaccharide composition after hydrolysis.

If the goal is to analyze constituent sugars such as xylose, fucose, arabinose, and glucuronic acid, the EPS should generally be hydrolyzed before HPLC analysis. Direct injection of the EPS supernatant or lyophilized polymer is unlikely to provide a simple monosaccharide profile because the sugars are part of a complex polymeric matrix.

Shodex SUGAR SZ5532 series may be considered for neutral sugar analysis. However, SZ5532 columns are not ideal when acidic compounds are present, and glucuronic acid is an acidic/ionic sugar. Therefore, SZ5532 may not be the best starting point if glucuronic acid must be included in the same method.

For hydrolyzed EPS samples containing both neutral sugars and glucuronic acid, Shodex SUGAR SH1011 may be a more practical starting point. SH1011 is used for saccharides and organic acids under acidic aqueous conditions and includes reference elution data for relevant compounds such as xylose, arabinose, fucose, and glucuronic acid.

If the customer is only interested in neutral monosaccharides, Shodex SUGAR SP0810 or NH2P-50 4E may also be considered depending on the required separation and detector.

Sample preparation is important for EPS analysis. Hydrolyzed samples should be clarified by filtration or centrifugation, and residual salts, acids, or matrix components should be considered because they can affect retention, peak shape, and detector response.

For more tailored recommendations, please contact Shodex technical support with details on whether the customer is analyzing intact EPS or hydrolyzed sugars, the detector type, sample preparation method, and target compounds.

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