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Related Experiment Video

Updated: May 20, 2026

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

Published on: April 7, 2017

Superhydrophilic zwitterionic polymers stabilize liposomes.

Zhiqiang Cao¹, Lei Zhang, Shaoyi Jiang

¹Department of Chemical Engineering, University of Washington, Seattle, Washington 98195, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|July 13, 2012

Summary

Zwitterionic poly(carboxybetaine) (PCB) stabilizes liposomes, overcoming the destabilizing effect of polyethylene glycol (PEG). PCB-modified liposomes demonstrate effective drug retention and prolonged circulation, offering a cholesterol-free alternative for drug delivery.

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Area of Science:

Materials Science
Nanotechnology
Biomedical Engineering

Background:

Polyethylene glycol (PEG) is a common stealth polymer for liposome modification, but its amphiphilic nature can destabilize liposomes.
Stabilizing PEGylated liposomes often requires incorporating cholesterol, which presents formulation challenges.
A need exists for alternative stealth polymers that enhance liposome stability without cholesterol.

Purpose of the Study:

To investigate the potential of zwitterionic poly(carboxybetaine) (PCB) as a cholesterol-free stabilizer for liposomes.
To evaluate the drug retention and in vivo blood circulation characteristics of PCB-modified liposomes.
To compare the antitumor efficacy of PCB-based liposomal doxorubicin with a commercial formulation (DOXIL).

Main Methods:

Modification of liposomes with poly(carboxybetaine) (PCB).
Assessment of hydrophilic drug retention in PCB-modified liposomes without cholesterol.
Evaluation of in vivo blood circulation time of PCB-modified liposomes.
Comparative study of antitumor therapeutic efficacy using PCB-liposomal doxorubicin versus DOXIL.

Main Results:

PCB-modified liposomes demonstrated effective stabilization without the need for cholesterol.
These liposomes exhibited good retention of hydrophilic drugs.
Long blood circulating characteristics were observed in vivo for PCB-modified liposomes.
The study provides a new approach to overcome the dilemma of PEGylated liposome destabilization.

Conclusions:

Zwitterionic poly(carboxybetaine) (PCB) effectively stabilizes liposomes due to its superhydrophilic property, resolving the issue associated with PEG.
PCB-modified liposomes offer a promising cholesterol-free platform for drug delivery with enhanced stability and prolonged circulation.
This novel PCB chemistry presents a viable alternative for developing advanced liposomal drug formulations.