Near Infrared with Principal Component Analysis as a Novel Analytical Approach for Nanoparticle Technology View Full Text


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Article Info

DATE

2000-09

AUTHORS

Irène Brigger, Pierre Chaminade, Didier Desmaële, Maria Teresa Peracchia, Jean d'Angelo, Robert Gurny, Michel Renoir, Patrick Couvreur

ABSTRACT

PURPOSE: To progress in the characterization of a poly(MePEGcyanoacrylate-co-hexadecylcyanoacrylate) (poly(PEGCA-co-HDCA) copolymer and the nanoparticles formed from this copolymer. METHODS: Poly(PEGCA-co-HDCA) at a MePEG/hexadecyl ratio of 1:4 was investigated by 1H-NMR and near infrared spectroscopy. The nanoparticle suspensions, obtained by the methods of nanoprecipitation or emulsion--solvent evaporation, as well as the crude nanoparticles and their dispersion medium--were analyzed by MePEG measurement, 1H-NMR, and near infrared spectroscopy. RESULTS: The 1H-NMR results showed that the (poly(PEGCA-co-HDCA) copolymer obtained bore lateral hydrophilic MePEG chains and lateral hydrophobic hexadecyl chains in a final ratio of 1:4. However, this ratio, although reproducible from batch to batch, represented only a mean value for different molecular species. Indeed, our results demonstrated the formation of more hydrophobic poly(alkyl-cyanoacrylate) oligomers (with a higher content of hexadecyl chains) and other more hydrophilic oligomers (with a higher MePEG content). Only the more hydrophobic oligomers were able to form solid pegylated nanoparticles. As far as these nanoparticles were concerned, determination of their MePEG content allowed the calculation of a distance of 1.2 nm and 1.05 nm between 2 grafted MePEG chains at the nanoparticle surface, when obtained by nanoprecipitation and emulsion-solvent evaporation, respectively. Moreover, when the same copolymer batch was used, different nanoparticles were obtained according to the preparation method, as seen by near infrared spectroscopy. CONCLUSIONS: The nanoparticles obtained by nanoprecipitation or emulsion-solvent evaporation of poly(PEGCA-co-HDCA) 1:4 copolymer displayed a different supramolecular organization, as evidenced by the near infrared spectroscopy results. Moreover, these nanoparticles showed surface characteristics compatible with a long circulating carrier. More... »

PAGES

1124-1132

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1026465931525

DOI

http://dx.doi.org/10.1023/a:1026465931525

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1023600557

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/11087046


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