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Basic Techniques and Aseptic Operations in Cell Culture
2025-11-21
Cell Culture and Laboratory InfrastructurePROTEIN
The core of Cell Culture lies in simulating the internal environment of an organism in vitro, providing the conditions necessary for cell survival, proliferation, and function. These conditions primarily include suitable temperature, an appropriate gas environment, stable pH, and a nutritionally complete culture medium.
Laboratory Planning and Core Equipment
A fully functional cell laboratory should be strictly divided into a reagent preparation area, a buffer area, and an aseptic operation area. Aseptic Operation is performed within a biosafety cabinet or laminar flow hood. The unidirectional, vertical flow of sterile air it creates serves as the first and most critical line of defense against microbial contamination in the entire Cell Culture Procedure.
Furthermore, the cell culture room must be equipped with key instruments such as an incubator for precise control of CO₂ concentration and temperature, an inverted microscope for daily observation, a centrifuge for cell harvesting, and a water bath for reagent pre-warming.
Reagent and Sterile Consumables Management
The culture medium is the "nutrient source" for cells, typically containing basal nutrients and serum or serum-free supplements. All liquids, such as culture medium, Trypsin, and PBS, must be confirmed sterile before use.
Culture flasks, Petri dishes, and pipettes are all single-use sterile consumables. Their standardized use is the material basis for implementing the concept of Aseptic Operation. Before planning any specific Cell Culture Methodologies, a complete and standardized laboratory infrastructure is a prerequisite for ensuring the success of all subsequent steps.
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Click for inquiryTechnical Analysis of Core Cell Culture MethodologiesPROTEIN
Primary Culture
This Cell Culture Methodologies involves isolating cells directly from tissue and initiating their first culture. Primary cells most closely reflect their in vivo biological characteristics. However, the preparation process is complex, the cells are highly heterogeneous, and their proliferation capacity in vitro is limited. The key to this technique is using enzymatic digestion or mechanical dissociation to break down the tissue into a single-cell suspension without causing severe damage to the cells.
Subculture
When adherent cells reach 80-90% confluency, or when suspension cell density becomes too high, subculturing must be performed. This is a core routine step in the Cell Culture Procedure, aimed at diluting cells at a specific ratio and transferring them to new vessels to provide continued space and nutrients. The key to this Cell Culture Methodologies lies in using Trypsin to precisely digest the attachments between cells and the substrate, followed by centrifugation to remove the digestion solution and cellular debris.
Cell Cryopreservation and Thawing
For long-term preservation of cell stocks, maintaining genetic stability, and reducing variations from continuous culture, cell cryopreservation is a crucial Cell Culture Methodologies. The standard procedure uses a controlled-rate freezing container to slowly freeze cells in medium containing a cryoprotectant, before transferring them to long-term storage in liquid nitrogen.
Thawing requires rapid warming, immediate dilution with fresh medium to remove the cryoprotectant, centrifugation, resuspension, and seeding. Rigorous cryopreservation and thawing protocols are among the core practices ensuring the reproducibility and sustainability of the entire Cell Culture Procedure.
Fig 1 Cell Culture
Meticulous Implementation of Aseptic OperationPROTEIN
Meticulous Pre-Operation Preparation
Personnel must wear clean lab coats, masks, and sterile gloves. All items placed inside the biosafety cabinet, including reagent bottles, pipettors, and gloves, must be sprayed and wiped with 75% ethanol. The interior space of the cabinet should be logically organized without overcrowding to prevent disruption of the sterile airflow field. Turn on the UV lamp for at least 30 minutes before starting operations to irradiate the interior space.
Standardized Manipulation During Operations
Flame Sterilization
For heat-tolerant glass or metal items, quickly pass the opening through the outer flame of an alcohol lamp before opening and closing to achieve instant high-temperature sterilization.
Avoiding Contamination Paths
Never pass arms or non-sterile items over the open tops of culture vessels or reagent bottles. Opened caps should be placed top-side down securely on the sterile work surface.
Precise Liquid Handling
Use calibrated electronic pipettors with sterile tips. Movements should be gentle and steady to avoid creating bubbles or splashing. Any tip that contacts a non-sterile surface must be discarded immediately and not reused.
Dedicated Management of Reagents and Consumables
Strictly adhere to the "Dedicated Reagent System" principle. Media, Trypsin, and other reagents used for different cell lines should be clearly distinguished and labeled to prevent cross-contamination. Recap bottles immediately after use. Avoid prolonged exposure of opened reagents outside the biosafety cabinet. Excellent Aseptic Operation is the cornerstone for the successful implementation of all advanced Cell Culture Methodologies.
Detailed Breakdown of Routine Cell Culture ProcedurePROTEIN
Pre-Experiment Preparation
Turn on the biosafety cabinet and room air conditioning system in advance to establish a stable environment. Take required reagents like culture medium, Trypsin, and PBS from the refrigerator and pre-warm them thoroughly in a 37°C water bath. Verify the temperature, humidity, and CO₂ concentration settings in the incubator.
Daily Observation and Status Assessment
Before handling cells, first conduct a systematic observation using an inverted microscope. Assessment criteria include: whether cell morphology is plump, contours are clear, adherence is firm, the color of the culture medium, and any signs of potential contamination such as cloudiness or floating particles.
Medium Change Operation
For slow-growing cells or cells requiring maintenance, change the medium regularly. When removing the old medium, place the pipette tip below the liquid surface but avoid touching the cell layer, and aspirate slowly. Then, slowly add pre-warmed fresh medium along the sidewall of the vessel to avoid directly washing over the cell layer.
Steps for Subculture
Remove Old Medium
Aspirate the old culture medium completely.
Rinse
Add pre-warmed PBS to gently rinse the cell surface, then aspirate it to remove residual serum which can inhibit Trypsin activity.
Digestion
Add an appropriate amount of pre-warmed Trypsin, ensuring it covers the entire cell layer. Place it in the incubator for digestion. Monitor the digestion time closely under the microscope. The optimal endpoint is when intercellular gaps widen and cells become rounded but have not detached in large numbers.
Neutralization
Add complete medium containing serum, with a volume at least twice that of the Trypsin. Gently pipette to neutralize the Trypsin activity.
Centrifugation for Collection
Transfer the cell suspension to a centrifuge tube. Centrifuge at a specific speed for several minutes to pellet the cells.
Resuspension and Counting
Discard the supernatant. Add a defined volume of fresh culture medium and gently pipette to create a single-cell suspension. Take a small aliquot for cell counting.
Seeding
Based on the cell count, calculate the required volume of cell suspension and seed it into new culture vessels containing fresh medium. Gently mix by rocking the vessel in a cross pattern.
Recording and Waste Disposal
Record key information such as the date, cell status, split ratio, cell count results, and reagent lot numbers used. Collect all biological waste materials for unified and safe disposal. Finally, thoroughly wipe down the interior of the biosafety cabinet with 75% ethanol, leaving it clean and ready for use.
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FAQsPROTEIN
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1. What should be considered when selecting serum for Cell Culture besides sterility?
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2. How should used culture vessels be handled after slight contamination of cells?
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3. What might have gone wrong if cell viability is low after thawing?
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4. What should be done if sterile gloves touch a non-sterile surface?
ReferencePROTEIN
[1] Philippeos C, Hughes RD, Dhawan A, Mitry RR. Introduction to cell culture. Methods Mol Biol. 2012;806:1-13.
[2] Lucey BP, Nelson-Rees WA, Hutchins GM. Henrietta Lacks, HeLa cells, and cell culture contamination. Arch Pathol Lab Med. 2009 Sep;133(9):1463-7.
[3] Bykowski T, Stevenson B. Aseptic Operation. Curr Protoc Microbiol. 2020 Feb;56(1):e98.
[4] Lian J, Ma X, Li X, Xia L. The environmental microbial retrieving assessment of cell-processing facilities for cell therapy in a hospital laboratory. Microbiol Spectr. 2024 Oct 3;12(10):e0125724.