Type

Journal Article

Authors

Carlos Medina
Owen I Corrigan
Maria-Jose Santos-Martinez
Krzysztof J Paluch
Anita Umerska
Lidia Tajber

Subjects

Chemistry

Topics
toxicity testing protamine polyelectrolyte complex nanoparticle polyelectrolyte nanoparticles chondroitin hyaluronate thermal stability nanoscience materials salmon calcitonin freeze drying chitosan trehalose

Freeze drying of polyelectrolyte complex nanoparticles: Effect of nanoparticle composition and cryoprotectant selection (2018)

Abstract 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.
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Full list of authors on original publication

Carlos Medina, Owen I Corrigan, Maria-Jose Santos-Martinez, Krzysztof J Paluch, Anita Umerska, Lidia Tajber

Experts in our system

1
Carlos Medina
Trinity College Dublin
Total Publications: 23
 
2
Owen I. Corrigan
Trinity College Dublin
Total Publications: 66
 
3
Maria Jose Santos-Martinez
Trinity College Dublin
Total Publications: 29
 
4
Krzysztof J. Paluch
Trinity College Dublin
Total Publications: 28
 
5
Anita Umerska
Trinity College Dublin
Total Publications: 8
 
6
Lidia Tajber
Trinity College Dublin
Total Publications: 83