Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10430249 | Biosensors and Bioelectronics | 2005 | 5 Pages |
Abstract
The bondforces between biotinylated surfaces and streptavidin or avidin coated beads are investigated by a magnetic field based manipulation system for magnetic microbeads. The magnetic field is generated by currents through a set of conducting lines, and its gradient exerts a force onto the magnetic beads. The force can be increased until the bond between the bead and the surface breaks. Consistent with other groups we found two conformations for both investigated bonds. The measured bondforces for the two conformations are for Streptavidin-Biotin: 55.9 and 244.7âfN and for Avidin-Biotin: 15.9 and 58.4âfN. These very low bondforces (10-100 times smaller than earlier measurements) match to the extremely low loading rate of about 1âfN/s. This new technique thus allows to investigate biomolecular bonds by extremely low forces.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Michael Panhorst, Paul-Bertram Kamp, Günter Reiss, Hubert Brückl,