MULTI-ARMED, MONOFUNCTIONAL, AND HYDROLYTICALLY STABLE DERIVATIVES OF POLY(ETHYLENE GLYCOL) AND RELATED POLYMERS FOR MODIFICATION OF SURFACES AND MOLECULES
申请人:NEKTAR THERAPEUTICS
公开号:US20130177961A1
公开(公告)日:2013-07-11
Multi-armed, monofunctional, and hydrolytically stable polymers are described having the structure
wherein Z is a moiety that can be activated for attachment to biologically active molecules such as proteins and wherein P and Q represent linkage fragments that join polymer arms poly
a
and poly
b
, respectively, to central carbon atom, C, by hydrolytically stable linkages in the absence of aromatic rings in the linkage fragments. R typically is hydrogen or methyl, but can be a linkage fragment that includes another polymer arm. A specific example is an mPEG disubstituted lysine having the structure
where mPEG
a
and mPEG
b
have the structure CH
3
O—(CH
2
CH
2
O)
n
CH
2
CH
2
— where n may be the same or different for poly
a
- and poly
b
- and can be from 1 to about 1,150 to provide molecular weights of from about 100 to 100,000.