Sofia Martinez
Centrifuge tubes are commonly used in laboratories to separate samples into components based on density. Proper cleaning and sterilisation of centrifuge tubes are essential to prevent cross-contamination, ensure accurate results, and extend the tubes' lifespan. This article will provide a comprehensive guide on how to effectively sterilise plastic centrifuge tubes, covering various methods such as autoclaving, chemical disinfectants, and manual cleaning procedures, ensuring that your plastic centrifuge tubes are sterile and ready for use in your laboratory.
| Characteristics | Values |
|---|---|
| Purpose | To prevent cross-contamination, ensure accurate results, and prolong the lifespan of the tubes |
| General cleaning procedure | Rinse with tap water, then soak in warm water with a mild detergent, scrub with a brush, and rinse with distilled water |
| Disinfection | Soak in 70% ethanol or another disinfectant solution for at least 30 minutes, then rinse with distilled water |
| Drying | Air dry on a microfiber cloth, or use an incubator or drying rack |
| Storage | Store in a clean, dust-free environment to prevent contamination |
| Inspection | Regularly inspect for cracks, chips, or other signs of damage, and replace if necessary |
| Autoclaving | Only autoclave centrifuge tubes with a melting point higher than the autoclaving temperature (e.g., High-Density Polyethylene, stainless steel, polycarbonate) |
| Autoclaving procedure | Autoclave for no longer than 20 minutes at 15 psi, upside down in a tube rack to avoid deformation |
| Other sterilisation methods | Dry heat sterilizer, ethanol, formaldehyde, hydrogen peroxide |
| Tube materials | Polypropylene, polycarbonate, polystyrene, glass |
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What You'll Learn
Identify the type of plastic centrifuge tube
Centrifuge tubes are available in a variety of materials, including glass and plastic, with a few being made of steel. The choice of material depends on the sample type, centrifugation speed, and the specific requirements of the experiment.
Plastic centrifuge tubes are the most common type and are made of durable polypropylene plastic. They are available in different sizes ranging from 0.2 mL to 50 mL and are ideal for general-purpose centrifugation applications. Polypropylene tubes exhibit exceptional chemical resistance to acids, bases, and organic solvents, alongside thermal stability (-80°C to 135°C), enabling autoclaving (121°C, 15 psi) for sterilization. Polypropylene tubes can generally meet the requirements of high-speed centrifugation and withstand high-speed centrifugal forces of up to 12,000 × g. They are also biocompatible, providing high transparency and ensuring clear visibility of samples.
Other plastic tubes are made of polystyrene, which may melt or deform under high temperatures. These tubes have been tested to withstand centrifugation of 12,000 RCF in a fully supported rotor with room temperature water.
Plastic tubes made of polyethylene may also melt or deform under high temperatures. They are not suitable for steam sterilization.
Polycarbonate is another material used for plastic centrifuge tubes, offering superior optical clarity for applications requiring precise spectro-photometric analysis. However, polycarbonate is less chemically resistant than polypropylene.
Glass centrifuge tubes are more resistant to chemical damage and can be sterilized using high-temperature methods. They are suitable for applications that require optical clarity, such as microscopy. Regular glass test tubes can generally withstand a relative centrifugal force (RCF) of less than 3000g, while borosilicate glass tubes can typically withstand over 10,000g of RCF. Glass tubes have stable shapes and can endure a certain degree of pressure, but they are prone to breakage during high-speed centrifugation.
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Use a detergent solution
To sterilize plastic centrifuge tubes using a detergent solution, begin by choosing a mild laboratory detergent that is compatible with your sample residues. Common choices include mild detergent solutions, isopropanol, or specialized enzymatic cleaners for bio-contaminants. Ensure that the detergent is diluted—a recommended ratio is 5-10 parts water to 1 part Solution 555™. Polycarbonate tubes should not be exposed to detergents with a pH higher than 8.
Next, briefly submerge the tubes in the detergent solution, taking care not to soak them for more than 10 minutes. Use appropriate cleaning brushes to gently scrub the inner and outer surfaces of the tubes, paying close attention to visible residues. Use a circular motion to dislodge contaminants, and avoid using abrasive materials or excessive force to prevent damage.
After scrubbing, thoroughly rinse the tubes with distilled water to remove any remaining detergent solution and loosened debris. Ensure that the tubes are completely rinsed to prevent contamination in subsequent experiments. Finally, allow the tubes to air dry by placing them on a drying rack or in an area with adequate air circulation.
It is important to note that plastic tubes should not be cleaned in glassware washers or automated dishwashers as these may produce excessively hot temperatures that can damage the tubes. Additionally, always refer to your facility's cleaning procedures and follow lab safety guidelines when working with any chemicals.
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Soak in 70% ethanol
To sterilize plastic centrifuge tubes, one method is to soak them in 70% ethanol. This method is suitable for plastic tubes that are not suitable for high temperatures. It is important to first identify the kind of centrifuge tube you are handling, as different types of tubes have different sterilisation requirements.
Plastic centrifuge tubes are usually composed of polypropylene, polycarbonate, or polystyrene. They resist chemicals but may scratch or warp. Before sterilising, rinse the tubes in distilled water to remove any remaining substances; for highly viscous or sticky materials, use warm water.
To sterilise using 70% ethanol, completely submerge the tubes in the ethanol solution for at least 30 minutes. Ensure that the tubes do not float and remain fully submerged. After sterilisation, remove the tubes from the solution and rinse them thoroughly with distilled water to remove any chemical residues. Place the tubes on a clean microfiber cloth to air dry.
It is important to regularly inspect plastic centrifuge tubes for cracks, scratches, or other signs of wear, as these can affect the integrity of the tube and its ability to be sterilised effectively. Proper cleaning and maintenance of centrifuge tubes are essential to prevent cross-contamination, ensure accurate results, and prolong the lifespan of the tubes.
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Autoclave for sterilisation
Autoclaves are machines used for sterilisation in healthcare, research, and industrial settings. They were invented by French microbiologist Charles Chamberland in 1879, building on the steam digester prototype created by physicist Denis Papin in 1679. Autoclaves are an essential part of the sterilisation process in healthcare facilities, where they are used to sterilise surgical instruments, lab instruments, and glassware, among other equipment.
The autoclave process involves three phases: conditioning, exposure, and sterilisation. During the conditioning phase, air is removed from the chamber using a vacuum system or a series of steam flushes and pressure pulses. This phase is critical as air inhibits sterilisation. In the exposure phase, the steriliser drain closes, and steam is continuously admitted into the chamber, increasing the pressure and temperature to a predetermined level. The items are then held at this sterilisation temperature for a fixed amount of time, as recommended by the manufacturer.
The quality of steam is vital to a successful autoclave sterilisation process. The recommended steam composition for efficient heat transfer is 97% steam (vapour) and 3% moisture (liquid water). Superheated steam, or dry steam with less than 3% moisture, is ineffective for sterilisation. Commonly recommended temperatures for steam sterilisation are 250° F (121° C), 270°F (132°C), or 275°F (135° C). The exposure time varies depending on the device being processed, but it is the minimum time required to kill any microorganisms present.
Autoclaves come in various sizes, from small countertop units in dental offices to large industrial autoclaves comparable to the size of a semi-truck or airplane. The size selected depends on the capacity and specific application requirements. Medical-grade autoclaves are regulated medical devices, and they are designed for continuous hospital use, featuring rectangular shapes and demanding maintenance requirements.
While autoclaves are widely used for sterilisation, they are not suitable for all materials. Heat-labile products, such as some plastics, cannot be sterilised in autoclaves as they will melt. Paper and other steam-sensitive items must also be sterilised using alternative methods.
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Air dry
Plastic centrifuge tubes should be cleaned after every use to prevent cross-contamination and inaccurate results. Before cleaning, the centrifuge should be powered off and unplugged. When handling the tubes, avoid any hazardous substances inside. Treat all potentially infectious or toxic samples with care.
To clean the tubes, use a mild laboratory detergent in warm water. Rinse and air dry. Air-drying is a critical step in the sterilization process. After rinsing, place the tubes on a drying rack or in an area with adequate air circulation to allow them to air dry completely. Avoid using cloth or paper towels, as they can leave behind lint or contaminants.
It is important to wear disposable gloves and appropriate protective clothing and safety gear to prevent contamination and injury. Before cleaning, examine the tubes thoroughly for any residue or signs of damage. After cleaning, maintain a cleaning log to record cleaning procedures, dates, and any tube issues.
It is also important to note that plastic tubes undergo some degree of softening at temperatures higher than 25°C. Therefore, it is advisable to avoid cleaning plastic tubes in glassware washers or automated dishwashers, as they may produce excessively hot temperatures.
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Frequently asked questions
Centrifuge tubes can be sterilized by using a disinfectant solution such as 70% ethanol, formaldehyde, or hydrogen peroxide. They can also be boiled in hot water for a few minutes or soaked in a detergent solution.
Autoclaves use pressurized high-temperature steam to sterilize plastic centrifuge tubes. They are considered the most dependable method of sterilization.
It is important to ensure that the plastic centrifuge tubes are compatible with autoclaving. The tubes should be autoclaved upside down in a tube rack for no longer than 20 minutes at 15 psi.
Plastic centrifuge tubes can be soaked in a mild detergent solution or a 1% nitric solution diluted with ultrapure water. They can also be boiled in hot water or wiped down with disinfecting towelettes.
Avoid using harsh chemicals such as bleach, as they can damage the tubes and affect the accuracy of results. Do not autoclave capped or sealed tubes, and always allow the tubes to cool before removing them from the autoclave.
