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Freeze drying of polyelectrolyte complex nanoparticles: Effect of nanoparticle composition and cryoprotectant selection
Tajber, Lidia; Umerska, Anita; Paluch, Krzysztof J.; Santos Martinez, Maria-Jose; Corrigan, Owen I.; Medina, Carlos
This work investigates the impact of nanoparticle (NP) composition and effectiveness of cryo-/lyo-protectants in a freeze drying process, which was employed to convert liquid dispersions of polyelectrolyte complex (PEC) NPs into completely redispersible powders. PEC NPs, with and without peptide, were produced by complex coacervation. The cryo-/lyo-protectants investigated were mannitol, trehalose (TRE) and poly(ethylene glycol) (PEG). The solid state of lyophilised powders was studied by thermal analysis and X-ray diffraction. Cytotoxicity studies were done by MTS assay and flow cytometry. The presence of a cryoprotectant was essential to achieve a successful powder reconstitution. The concentration of TRE was optimised for each type of PEC NPs. Protamine- and hyaluronate-based NPs reconstituted better than chitosan- and chondroitin sulphate-based NPs, respectively. PEG polymers were found to be more effective cryoprotectants than TRE and best results were achieved using co-freeze drying of NPs with TRE and PEG. These ternary NPs/TRE/PEG samples were crystalline, with expected better storage stability. PEG polymers were well tolerated by Caco-2 cells, with the exception of linear PEG 10?kDa. This work shows that, as regards the formulation design and maximising NP loading in the dried product, optimisation of the cryoprotectant type and content is needed as it is highly dependent not only on the type of polyelectrolyte pair in the PEC, but also the polyions ratio.
Keyword(s): Polyelectrolyte complex nanoparticle; Freeze drying; Hyaluronate; Chitosan; Chondroitin; Protamine; Nanoscience & Materials; FREEZE-DRYING; THERMAL-STABILITY; TOXICITY TESTING; TREHALOSE; polyelectrolyte nanoparticles; salmon calcitonin
Publication Date:
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: Trinity College Dublin
Citation(s): Umerska, A., Paluch, K.J., Santos-Martinez, M.J., Corrigan, O.I., Medina, C. & Tajber, L., Freeze drying of polyelectrolyte complex nanoparticles: Effect of nanoparticle composition and cryoprotectant selection, International Journal of Pharmaceutics, 552, 1-2, 2018, 27 - 38
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First Indexed: 2019-11-27 07:14:17 Last Updated: 2020-10-29 06:46:44