Journal
EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
Volume 60, Issue 3, Pages 391-399Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ejpb.2005.02.009
Keywords
nanoparticles; polyalkylcyanoacrylate; PBCA; molecular weight; gel permeation chromatography; size exclusion chromatography; matrix-assisted laser desorption ionization time of flight mass spectrometry
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Matrix-assisted laser desorption ionisation time-of-flight mass spectrometry (MALDI-TOF MS) and size exclusion chromatography (SEC) were employed to elucidate the chemical composition, mean number average molecular weight (M-n), mean weight average molecular weight (M-w), and polydispersity (PD) of poly(butyl cyanoacrylate) (PBCA) manufactured by emulsion polymerisation. Both methods gave similar results for M-n, but substantial differences were observed for M-w and PD, with MALDI producing consistently lower values which could not be improved by off-line coupling of SEC and MALDI. MALDI gave a more detailed view on the chemical composition of the cyanoacrylate and revealed the presence of two additional polymer series with different end groups besides the expected PBCA series, which showed different retention in SEC. Their formation is explained by the secession/addition of formaldehyde from/to the regular polymer via (reverse) Knoevenagel reaction. In additional experiments, the influence of different pH on PBCA-NP during polymerisation was examined by comparison of polymerisation yield and particle diameter to their chemical composition as revealed by the MALDI spectra. The most uniform nanoparticles, with the highest polymerisation yield, narrowest particle size, and mass distribution were produced at pH I. (c) 2005 Elsevier B.V. All rights reserved.
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