RU response to concentration

How can we translate the RU response to the amount of ligand we would like to immobilize on our chip? In other words, how do we convert the RU response to concentration of ligand for injection?

Thank you.

Hi,

First calculate the amount of ligand to be immobilized based on the relative size differences between ligand and analyte.

I assume you use the amine coupling on a dextran chip.
Then use a pre-concentration experiment to determine the correct pH and ligand concentration to get a pre-concentration rate between 15 – 40 RU/s. Use a report point during the pre-concentration to determine the slope in RU/s.
www.sprpages.nl/immobilization/ligand-pre-concentration

The actual ligand concentration is not of real importance as long as the pre-concentration is fast enough for the desired immobilization target. We use normally a maximum of 100 µl ligand solution (5 – 20 µg/ml) to immobilize between 200 – 5000 RU ligand (5000 – 160000 Da).

For more information and calculation please refer to www.sprpages.nl/immobilization

Kind regards

Arnoud