Essential Cell Culture Techniques: A Guide to Sterile Practice & Routine Protocol
I. Cell Culture Basics & Lab Setup
Cell culture replicates the in vivo environment in vitro, providing essential conditions: temperature, gas, pH, and nutrient-rich medium.
A functional lab requires separate zones for reagent prep, buffering, and aseptic work. The biosafety cabinet provides sterile airflow, preventing contamination. Key equipment includes a CO₂ incubator, inverted microscope, centrifuge, and water bath.
Culture medium, trypsin, and PBS must be sterile. Sterile consumables (flasks, pipettes) are essential for aseptic technique. Proper lab setup is foundational to successful culture.
II. Core Cell Culture Methods
Primary Culture
Isolating cells directly from tissue. Cells retain in vivo traits but are heterogeneous and have limited proliferation. Enzymatic or mechanical dissociation is used.
Subculture
Necessary when cells reach high density. Trypsin digests cell attachments; cells are centrifuged, resuspended, and reseeded.
Cryopreservation and Thawing
Cells are frozen slowly in cryoprotectant medium and stored in liquid nitrogen. Thawing requires rapid warming, dilution, centrifugation, and reseeding. These steps ensure long-term cell viability and genetic stability.
III. Aseptic Technique
Pre-operation
Wear lab coats, masks, and gloves. Sterilize items with 75% ethanol and UV-irradiate the cabinet.
During operation
Flame-sterilize openings; avoid reaching over open containers; use sterile pipette tips and discard if contaminated.
Reagent management
Use dedicated, labeled reagents for different cell lines. Recap bottles promptly. Aseptic practice is critical for all culture methods.
IV. Routine Cell Culture Procedure
Preparation
Pre-warm reagents and verify incubator settings.
Observation
Use a microscope to check cell morphology, adherence, and medium clarity.
Medium change
Aspirate old medium gently; add fresh medium along the vessel wall.
Subculture steps
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Remove old medium.
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Rinse with PBS.
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Digest with trypsin until cells round up.
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Neutralize with serum-containing medium.
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Centrifuge to pellet cells.
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Resuspend, count, and seed into new vessels.
Record details and dispose of waste. Clean the cabinet after use.
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