Quantification of capsular polysaccharide of Streptococcus pneumoniae serotype 14 in culture broth samples

Quantification of capsular polysaccharide of Streptococcus pneumoniae serotype 14 in culture broth samples

Streptococcus pneumoniae is a major cause of mortality in underdeveloped countries, where more than one million people die from pneumococcal disease every year. Vaccines are the most efficient method for preventing the infection and are based on the capsular polysaccharide (PS) protection. The serot...

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Bibliographic Details
Published in:Analytical biochemistry Vol. 421; no. 1; pp. 250 - 255
Main Authors: Gogola, Verônica M.R., Carmo, Talita S., Geraldo, Carolina S.F., Figueiredo, Douglas B., Gonçalves, Viviane M.
Format: Journal Article
Language:English
Published: United States Elsevier Inc 01-02-2012
Subjects:
Bacterial Capsules - analysis
Chromatography, High Pressure Liquid - methods
Culture Media
detection limit
developing countries
ELISA
enzyme-linked immunosorbent assay
Enzyme-Linked Immunosorbent Assay - methods
Humans
mortality
people
Phenol
Pneumococcus
Polysaccharide
polysaccharides
Quantification
serotypes
Serotyping
Species Specificity
statistical analysis
Streptococcus pneumoniae
Streptococcus pneumoniae - chemistry
Streptococcus pneumoniae - classification
Streptococcus pneumoniae - growth & development
Streptococcus pneumoniae - pathogenicity
Sulfuric Acids
vaccines
Quantification
Pneumococcus
Polysaccharide
ELISA
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Summary:Streptococcus pneumoniae is a major cause of mortality in underdeveloped countries, where more than one million people die from pneumococcal disease every year. Vaccines are the most efficient method for preventing the infection and are based on the capsular polysaccharide (PS) protection. The serotype 14 is the most frequent in pediatric infections worldwide. This study aimed to establish a quantification protocol for PS present in culture broth samples of S. pneumoniae serotype 14 (PS14) and use this protocol for selection of the best PS14 producer strain. Phenol-sulfuric, HPSEC, competitive ELISA, and sandwich ELISA methods were tested for PS14 quantification. Sandwich ELISA was the method with the best reproducibility and sensitivity and the least susceptible to interferences. The quantification limit and detection limit of this method were 0.99 and 0.57 ng/mL, respectively. Statistical analysis was performed to calculate the coefficient of variation (CV) intraassay (1–3% intraplate and 2–6% interplate) and interassay (11–15%) and the reproducibility in different days (CV < 20%). The sandwich ELISA allows us to select, among six strains evaluated, the strain 5287 as the best PS14 producer (11.68 mg PS14/biomass) and it was shown to be the best choice for measurement of pneumococcal polysaccharides in culture broth samples.
Bibliography:http://dx.doi.org/10.1016/j.ab.2011.11.029
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0003-2697
1096-0309
DOI:10.1016/j.ab.2011.11.029