This present disclosure provides various
diamine centered poly(
amino acid)-saccharide-lipid conjugates. In various embodiments, the conjugates can safely be used as water
solubility or
bioavailability enhancers. In one aspect, the present disclosure provides a conjugate having the
structural formula wherein B is a residue of a compound having three or four available binding positions, e.g., an alkylene
diamine; S is a saccharide, for example, a residue of a mono-, di- or
trisaccharide group, in which each saccharide unit is a
sugar, a
sugar alcohol, an
amino sugar or a
sugar acid; L is a lipophilic carrier residue selected from
fatty acid residues (for example, residues of
lauric acid,
myristic acid,
linoleic acid,
palmitic acid,
oleic acid and elaidic acid),
steroid acid and
sterol residues, and residues of retinoids carotenoids, tocopherols, and tocotrienols; Q is a residue of
ethylene glycol,
diethylene glycol,
triethylene glycol,
tetraethylene glycol, pentaethylene glycol or hexaethylene glycol; P is a residue of a polyaminoacid homopolymer; R2 is a terminal group selected from H, methyl, ethyl and
maleimide; D is a secondary group that is as defined above for L or is a methyl-capped poly(
ethylene glycol) residue; and d is 0, or d is 1.