Fluorescent compounds include near infrared fluorochromes that are covalently linked to polyethylene glycol (PEG). The compounds behave like PEG in biological systems. One fluorescent compound has the formula (I): wherein R
1
is a fluorescent moiety having an absorption wavelength maxima in the range of 450 to 1500 nanometers, R
2
is a non-reactive moiety, and n is an integer. Another fluorescent compound has the formula (II): wherein R
1
is a fluorescent moiety having an absorption wavelength maxima in the range of 450 to 1500 nanometers, R
2
is a non-reactive moiety, R
3
is a scaffold including an amino acid group, and n is an integer. The scaffold can be attached to a chelate, protein, enzyme, peptide, antibody, or drug that can target a site in a subject.
荧光化合物包括共价连接到聚
乙二醇(P
EG)的近红外荧光
染料。这些化合物在
生物系统中的行为类似于P
EG。其中一种荧光化合物的
化学式为(I):其中,R1是一个荧光基团,其吸收波长最大值在450到1500纳米的范围内,R2是一个非反应性基团,n是一个整数。另一种荧光化合物的
化学式为(II):其中,R1是一个荧光基团,其吸收波长最大值在450到1500纳米的范围内,R2是一个非反应性基团,R3是一个包括
氨基酸基团的支架,n是一个整数。支架可以连接到
螯合剂、蛋白质、酶、肽、
抗体或药物,以定位到主体中的某个位点。