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Surface modification of haemoglobin-containing liposomes with polyethylene glycol prevents liposome aggregation in blood plasma.

Authors
  • Yoshioka, H1
  • 1 Japan Research Center of W.R. Grace & Co.-Conn., Kanagawa, Japan. , (Japan)
Type
Published Article
Journal
Biomaterials
Publisher
Elsevier
Publication Date
Nov 01, 1991
Volume
12
Issue
9
Pages
861–864
Identifiers
PMID: 1764558
Source
Medline
Language
English
License
Unknown

Abstract

With a view to prevention of liposome aggregation in plasma which is a lethal problem when using artificial erythrocytes, modification of the liposome surface with polyethylene glycol (PEG)-bound cholesterol or phospholipid was studied. The cholesterol or phospholipid moiety works as a scaffold for immobilization of the modifiers to the liposome. The modified liposome aggregability is significantly reduced with increased PEG content and particularly with increased PEG chain length. In addition, the zeta potential of modified liposomes decreases with increased PEG chain length. It is concluded that the long PEG chain exposed on the liposome surface prevents the adsorption of plasma proteins on to the surface by its excluded volume effect and, as a result, effectively reduces the liposome aggregability in plasma.

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