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🔬 Cell Biology · Method

Flow Cytometry (FACS)

High-throughput multi-parameter analysis
🎯 Difficulty ★★★ Advanced Duration About 4–6 h 🎯 Use Immunophenotyping, surface marker detection, cell sorting and functional analysis
📖 Principle
Single cells pass lasers sequentially; scatter and fluorescence detected in multiple channels per cell
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📋 Workflow

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1

Sample preparation

1 h
Prepare single-cell suspension, count and adjust density, cells should be monodisperse
💡 Tip Remove clumps and debris
⚠️ Caution Viability affects staining and scatter
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2

Antibody staining

1 h
Add fluorochrome-conjugated antibodies, incubate at 4°C in dark, wash off unbound
💡 Tip Include isotype and single-stain controls
⚠️ Caution Protect from light throughout
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3

Acquisition

1 h
Set lasers and fluorescence channels, adjust voltages, acquire and record events
💡 Tip Run controls first to set compensation
⚠️ Caution Moderate flow rate prevents doublets
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4

Data analysis

1 h
Use software to gate out debris/doublets, quantify subset percentages and intensities
💡 Tip Consistent gating ensures comparability
⚠️ Caution Document gating for reproducibility
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⚠️ 5 Common Beginner Mistakes

  • Clumping causes doublet events skewing analysis
  • Wrong compensation causes fluorescence spillover artifacts
  • EDTA in buffer affects some markers
  • Improper antibody amount causes weak signal or non-specific binding
  • Photobleaching attenuates signal

❓ FAQ

+How to choose fluorochrome panels?
Choose spectrally separated, low-compensation combinations matched to laser setup.
+What is gating?
Selecting cell subsets by scatter/fluorescence, excluding debris and doublets.
+Can cells be sorted simultaneously?
FACS can sort cells by gating into separate populations for downstream culture/analysis.

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Data authenticity: Product categories from JW Supply Chain standard taxonomy; method→step→product connected. Last updated: 2026-08-23 · v3.0