| abstract |
A polyalkylene glycol derivative containing a compound of the formula (1): n n nwherein R is a hydrocarbon group having 1 to 24 carbon atoms, OA 2 is an oxyalkylene group having 2 to 4 carbon atoms, the groups represented by R are the same or different from each other in one molecule, the groups represented by OA 2 are the same or different from each other in one molecule, m is an average number of moles of the oxyalkylene group added, m represents 10 to 1000, and X represents a functional group capable of chemically reactive with a bio-related substance, npolydispersity Mw/Mu of the above polyalkylene glycol derivative in gel permeation chromatography satisfying the following relationship: n n Mw /Mn≦1.07 nwherein Mw represents a weight average molecular weight and Mn represents a number average molecular weight. |