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Impact Of Dose And Surface Features On Plasmatic And Liver Concentrations Of Biodegradable Polymeric Nanocapsules

L. T. Oliveira, Mônica Auxiliadora de Paula, B. M. Roatt, G. M. Garcia, Luan Silvestro Bianchini Silva, A. B. Reis, C. S. de Paula, José Mário Carneiro Vilela, M. Andrade, Gwenaelle Pound-Lana, Vanessa Carla Furtado Mosqueira
Published 2017 · Chemistry, Medicine

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ABSTRACT The effect of polymeric nanocapsule dose on plasmatic and liver concentrations 20 min after intravenous administration in mice was evaluated. Nanocapsules were prepared with different polymers, namely, poly(D,L‐lactide) (PLA), polyethylene glycol‐block‐poly(D,L‐lactide) (PLA‐PEG), and PLA with chitosan (PLA‐Cs) and compared with a nanoemulsion. These formulations were labelled with a phthalocyanine dye for fluorescent detection. The nanostructures had narrow size distributions upon separation by asymmetric flow field flow fractionation with static and dynamic light scattering detection, with average hydrodynamic diameters in the 130–300 nm range, negative zeta potentials, except PLA‐Cs nanocapsules, which had a positive zeta potential. Flow cytometry revealed uptake mostly by monocytes and neutrophils in mice and human blood. PLA nanocapsules and the nanoemulsion showed dose‐dependent plasma concentrations, where the percentage of plasmatic fluorescence increased with increasing administered dose. In contrast, PLA‐PEG nanocapsules led to a dose‐independent plasmatic profile. PLA‐Cs nanocapsules showed the lowest plasmatic and liver levels of fluorescence at all administered doses and significant intravenous toxicity in mice. This work demonstrates the importance of considering the nanocarrier dose when evaluating pharmacokinetic and biodistribution data and emphasizes the role of surface features in determining the plasmatic and liver concentrations of a poorly soluble lipophilic encapsulated compound. Graphical abstract Figure. No Caption available.
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