Tandem fluorophore compensation beads show spectral shift or altered emission profile over time, causing incorrect spillover calculation and poor compensation in acceptor channels.
Common Causes
1Tandem dyes (PE-Cy5, PE-Cy7, APC-Cy7, etc.) degraded due to light exposure during storage
2Stale bead controls prepared hours or days before use allowing dye degradation
3Prolonged room temperature storage of stained beads before acquisition
4Using compensation matrix from previous experiment without fresh bead preparation
Solutions
1Prepare fresh compensation bead controls immediately before each acquisition session
2Protect all tandem dye-stained beads from light exposure during preparation and storage
3Re-generate compensation matrix for every experiment, do not reuse old matrices
4Store tandem dye antibodies at 4°C in dark conditions and check expiration dates
5Minimize time between bead staining and flow cytometer acquisition