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作者： Natalia Toncheva-Monchevaa. Emilia Veleva-Kostadinovaa. Christo Tsvetanova. Denitsa Momekovab. Stanislav Rangelova.
a
Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev 103-A, 1113 Sofia, Bulgaria
b
Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Medical University-Sofia, 2 Dunav Street, 1000 Sofia, Bulgaria
摘要：A series of random copolymers of 2-isopropyl-2-oxazoline and ethylenimine (PiPOX-ran-PEI) with PEI contents 5–84% were prepared by partial acidic hydrolysis of poly(2-isopropyl-2-oxazoline) (PiPOX). Dynamic and electrophoretic light scattering were utilized to investigate aqueous solution properties of the copolymers. Above the phase transition temperature of PiPOX, well-defined nanoparticles (mesoglobules) typically ranging in size 200–500 nm, depending on the heating protocol, and surface potential reaching +35 mV, were formed. The mesoglobules consisted of a core dominated by PiPOX and a thin positively charged shell from PEI moieties which mediated formation of polyplexes with DNA. Upon complexation with DNA, performed at 65 °C and at varying N/P (amine-to-phosphate groups) ratios, well-defined polyplex particles with dimensions ranging between 110 and 250 nm and typically negative ζ potential were formed. Cooling down to the physiologically relevant temperature of 37 °C resulted in a slight-to-moderate increase of the size due to swelling of the polyplex particles and reduction of the negative ζ potential. The copolymers with PEI contents ≥15% can be considered perspective for delivery of polynucleotides.
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