Quantitative nuclear magnetic resonance analysis and characterization of the derivatized Haemophilus influenzae type...

Area of Science:

• Vaccinology
• Analytical Chemistry
• Biochemistry

Background:

• PedvaxHIB is a crucial pediatric vaccine against Haemophilus influenzae type b (Hib).
• The vaccine's efficacy relies on chemically conjugating Hib capsular polysaccharide to Neisseria meningitidis outer membrane proteins.
• Accurate characterization of the derivatized polysaccharide is essential for vaccine quality control.

Purpose of the Study:

• To present and validate a quantitative Nuclear Magnetic Resonance (NMR) methodology.
• To characterize the derivatized polysaccharide component of PedvaxHIB.
• To establish a reliable and efficient analytical method for vaccine quality assessment.

Main Methods:

• Development of a quantitative NMR assay for derivatized polysaccharide.
• Validation of the NMR assay according to International Council for Harmonisation (ICH) guidelines.
• Assessment of assay precision, accuracy, specificity, ruggedness, and robustness.

Main Results:

• The quantitative NMR assay demonstrated high precision (RSD ≤ 1%) and accuracy.
• The method showed excellent specificity, with no observable matrix interference.
• The assay proved rugged (RSD < 3% for inter-day/inter-operator variability) and robust to environmental changes.

Conclusions:

• The validated quantitative NMR assay is a reliable method for product release and process monitoring of PedvaxHIB.
• This NMR technique offers a more efficient alternative to existing labor-intensive chromatographic and colorimetric methods.
• The established methodology ensures consistent quality and safety of the Hib vaccine.