Why are the beads from PTMScan® HS Kits aggregating against the sides of the tube?

Through in-house testing, we have found that the magnetic beads from our PTMScan HS kits aggregate and stick to the walls of some specific brands of tubes. Moreover, they cannot be washed off or spun off the sides of the tubes. This is an issue with specific brands of tubes themselves and not an inherent issue with the PTMScan bead product. Therefore, the following brands of polypropylene tubes are NOT recommended with magnetic bead PTMscan HS kits: 
1. CellTreat #229441, polypropylene 1.5mL tube, non-sterile, non-pyrogenic
2. Denville Scientific (Harvard Bioscience) #C3171, 1.5mL Posi-Lock tubes, polypropylene

The following brand of microcentrifuge tubes is compatible with magnetic bead PTMscan HS kits:
1. USA scientific tubes #1615-5500
 

Last updated: March 14, 2024