Newly synthesized amphiphilic polyacrylamide and poly(vinyl pyrrolidon
e), single terminus-modified with long-chain fatty acyl groups, are ab
le to incorporate into the liposomal membrane, and similar to poly(eth
ylene glycol) prolong liposome circulation in vivo and decrease liposo
me accumulation in the liver. Protective efficacy of modified polymers
increases with the increase in the length of acyl moiety and decrease
s for higher molecular weight polymers. The data on amphiphilic polyme
r-modified liposome biodistribution are presented.