Structure and molar mass analysis of pneumococcal capsular polysaccharides by 1 H NMR and HPSEC-MALLS
10.3760/cma.j.issn.0254-5101.2013.09.012
- VernacularTitle:核磁共振氢谱和高压液相分子排阻层析-十八角激光散射仪对肺炎链球菌荚膜多糖的结构及分子质量分析
- Author:
Jichun SHI
;
Shuquan LUO
;
Maoguang LI
;
Ani LI
;
Chune WANG
;
Yingying YANG
;
Qiang YE
;
Guilin XIE
;
Zhiqiang ZHAO
- Publication Type:Journal Article
- Keywords:
Pneumococcal capsular polysaccharide;
1 H NMR;
Chemical structure;
HPSEC-MALLS;
Weight-average molecular mass
- From:
Chinese Journal of Microbiology and Immunology
2013;(9):700-705
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the structures and molecular weight distributions of the capsular polysaccharides from 6 serotypes of pneumococcus .Methods The structures of pneumococcal capsular pol-ysaccharides of 6 serotypes were analyzed by 1 H nuclear magnetic resonance ( NMR) .Chemical shifts of all characteristic protons were investigated to analyze polysaccharide integrity and inter -assay consistency .High performance size exclusion chromatography-multi angle laser light scattering ( HPSEC-MALLS) was used to measure the molecular weights .Results The chemical shifts of all characteristic protons of the pneumococ-cal capsular polysaccharides of 6 serotypes were consistent with the standard chemical shift .The weight-aver-age molecular mass of the pneumococcal capsular polysaccharides ranged from 7.182×104 g/mol(for serotype 19A) to 1.273×106 g/mol(for serotype 9V)examined by HPSEC-MALLS.Conclusion The structures and molecular weight distributions of pneumococcal capsular polysaccharides could be rapidly and effectively ana -lyzed by 1 H NMR and HPSEC-MALLS.Moreover, C-PS and acetate contained in capsular polysaccharides could also be detected .HPSEC-MALLS is an applicable method for the quantitative analysis of molar mass distributions in different serotypes of pneumococcal capsular polysaccharides . Although 1 H NMR and HPSEC-MALLS have been accepted as the quality control measurements by WHO , to use them as the re-placements of the traditional QC method still needs further investigation .
