4-Arm PEG-X/Y , MW 2k-20k

4-Arm PEG-X/Y represents bifunctional 4-arm PEG reagents. It has two different functional groups X and Y with 1:3, 3:1 or 2:2 ratio. We started offering this series of special reagents as custom synthesis with any combination of two functional groups. We are also listing some of these reagents as regular catalog products that are ready to ship overnight.

We offer three ratios for each pair of functional groups. 1:3, 2:2 and 3:1. An example is listed below.

Amine(3)/Acid(1) - 3 amine groups and 1 acid group;

Amine(2)/Acid(2) - 2 amine groups and 2 acid group;

Amine(1)/Acid(3) - 1 amine groups and 3 acid group;

Other pairs of functional groups include:

Amine/Biotin,

Amine/Maleimide,

Amine/Azide,

Amine/Acrylamide,

Amine/Thiol,

Amine/Acid,

Amine/FITC,

Amine/Rhodamine,

Biotin/Maleimide,

Biotin/Azide,

Biotin/Acid,

Biotin/Thiol,

Thiol/Acid,

Maleimide/FITC.