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Loading of Tetanus Toxoid to Biodegradable Nanoparticles from Branched Poly(Sulfobutyl-Polyvinyl Alcohol)-g-(Lactide-Co-Glycolide) Nanoparticles by Protein Adsorption: A Mechanistic Study

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Abstract

Purpose. Mucosal delivery of vaccine-loaded nanoparticles (NP) is an attractive proposition from an immunologic perspective. Although numerous NP preparation methods are known, sufficient antigen loading of NP remains a challenge. The aim of this study was to evaluate adsorptive loading of NP with a negatively charged surface structure using tetanus toxoid (TT) as a model vaccine.

Methods. Blank NP, consisting of poly(sulfobutyl-polyvinyl alcohol)-g-(lactide-co-glycolide), as well as poly(lactide-co-glycolide) NP were prepared by a solvent displacement technique. The use of polymers with different degrees of substitution resulted in NP with different negative surfaces charges. Adsorption of TT to NP was performed varying to NP surface properties, protein equilibrium concentration, and loading conditions.

Results. The protein adsorption was controlled by NP surface properties, and maximum TT adsorption occurred at highly negatively charged NP surfaces. Results from isothermal titration calorimetry and ζ-potential measurement suggest an adsorption process governed by electrostatic interactions. The adsorption followed the Langmuir isotherm in the concentration ranges studied. TT withstood this gentle loading procedure in a nonaggregated, enzyme-linked immunoabsorbant assay-active form.

Conclusions. The results demonstrate that negatively charged NP consisting of poly(sulfobutyl-polyvinyl alcohol)-g-(lactide-co-glycolide) are suitable for adsorptive loading with TT and may have potential for mucosal vaccination.

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Authors
  1. Tobias Jung
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  2. Walter Kamm
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  3. Armin Breitenbach
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  4. Gerhard Klebe
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  5. Thomas Kissel
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Jung, T., Kamm, W., Breitenbach, A. et al. Loading of Tetanus Toxoid to Biodegradable Nanoparticles from Branched Poly(Sulfobutyl-Polyvinyl Alcohol)-g-(Lactide-Co-Glycolide) Nanoparticles by Protein Adsorption: A Mechanistic Study. Pharm Res 19, 1105–1113 (2002). https://doi.org/10.1023/A:1019833822997

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