Abstract
Capsular polysaccharides of Streptococcus pneumoniae contain a characteristic mix of monosaccharides in their structure resulting in immunologically distinct serotypes. Pneumococcal capsular polysaccharides include sugars such as hexoses, uronic acids, hexosamines, methyl pentoses, other functional groups are attached to the sugars are N and O-acetyl groups, nitrogen and phosphorus. Most of these components can be quantified using different colorimetric methods. However, available methods for quantifying nitrogen and phosphorus are not sensitive enough and laborious. We report a highly sensitive high-performance anion-exchange chromatography-conductivity detector (HPAEC-CD) method for quantifying nitrogen and phosphorus present in pneumococcal capsular polysaccharides. The method is reliable, robust and reproducible with no interference. The LOQ for nitrogen and phosphorus of 3.125 and 62.5 ng/mL, respectively, is highly critical for estimating low levels of total nitrogen and total phosphorus. We have implemented this method to quantify total nitrogen in Typhoid Vi polysaccharide and phosphorus in Haemophilus influenzae type-b polysaccharide. This method has greater application for quantification of nitrogen and phosphorus present in low concentrations in polysaccharide vaccines/biologicals.
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