1)3-arm Branched PEG (SUNBRIGHT® GL3 Series)

3-arm activated branched PEGs, to which another PEG spacer is introduced to 2-arm activated branched PEGs, show a higher reactivity with pharmaceutical substances.

2)4-arm Branched PEG (SUNBRIGHT® GL4 Series)

4-arm activated branched PEGs can reduce the viscosity of the relevant aqueous solutions, by introducing a larger number of branching points even without altering the molecular weight.

Comparison Data of PEG-Solution Viscosity