High Side Scatter Background from Small Particles

Symptom

Flow cytometry SSC channel shows elevated background noise from small particles and debris. Event plots display excessive scatter in low SSC/FSC regions, indicating presence of cell fragments or contaminants.

1. 1 Cell lysis due to non-fresh samples or improper preparation protocols, creating membrane fragments
2. 2 High centrifuge rotor speed or excessive vortexing causing mechanical cell damage and fragmentation
3. 3 Bacterial contamination in sample producing autofluorescence at low level and high event rates

1. 1 Ensure cells in sample have not lysed; use fresh samples and proper preparation techniques
2. 2 Do not centrifuge cells at high rotor speed (keep below 300-400 x g); avoid violent vortexing; handle cells gently throughout protocol
3. 3 Ensure sample is not contaminated; work in sterile conditions; use aseptic technique during cell preparation; filter samples if necessary

Related Video (3)

Bilibili (China-Accessible Mirrors) ★ 85

Flow Cytometry Experimental Operation in 7 Minutes

"Shows complete flow cytometry sample preparation and instrument operation, directly relevant to avoiding lysis-induced debris."

Bilibili (China-Accessible Mirrors) ★ 80

Flow Cytometry Complete Workflow: Sample to Analysis

"Includes troubleshooting for flow cytometry from sample to analysis, matching the failure scenario of cell fragments and contamination."

Bilibili (China-Accessible Mirrors) ★ 70

Ten-Minute Guide to Flow Cytometer Instrument Operation

"Practical tutorial on scatter plots and gating, helping identify and exclude debris in SSC/FSC regions."