1. Interaction between PEG lipid and DSPE/DSPC phospholipids: An insight of PEGylation degree and kinetics of de-PEGylation
- Author
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Maria Grazia Sarpietro, Maria Chiara Cristiano, Christian Celia, Maria Lorena Accolla, Felisa Cilurzo, Donatella Paolino, Donato Cosco, Francesco Castelli, and Massimo Fresta
- Subjects
liposomes ,Kinetics ,Phospholipid ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Polyethylene Glycols ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,Differential scanning calorimetry ,Drug Stability ,Dynamic light scattering ,Physical and Theoretical Chemistry ,Stealth liposomes ,Liposome ,Chromatography ,Phosphatidylethanolamines ,liposomes, PEG, DSPE ,Bilayer ,Surfaces and Interfaces ,General Medicine ,021001 nanoscience & nanotechnology ,PEG ,0104 chemical sciences ,Solutions ,chemistry ,Phosphatidylcholines ,PEGylation ,Biophysics ,0210 nano-technology ,DSPE ,Biotechnology - Abstract
The degree to which liposomes are PEGylated is the feature, which most influences the length of the presence of stealth liposomes in the bloodstream. In order to thoroughly investigate the maximum amount of DSPE-PEG2000 that can be used to stabilize stealth liposomes, these were synthesized at different concentrations of DSPE-PEG2000 and their physicochemical properties were investigated by using differential scanning calorimetry (DSC). The kinetics of PEGylation and de-PEGylation were performed by incubating non-stealth liposomes in a DSPE-PEG2000 suspension at different incubation times, and then analyzing the data using DSC and dynamic light scattering (DLS) techniques. The results demonstrated that DSPE-PEG2000 was self-assembled in the phospholipid bilayers, thus forming stealth liposomes. The different amounts of DSPE-PEG2000 in the bilayer triggered a de-PEGylation phenomenon, resulting in mixed nanoaggregates, which derived from the detergent-like properties of the PEGylated phospholipids.
- Published
- 2017
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