Sofia Martinez
EDTA, or ethylenediaminetetraacetic acid, is a chemical often used in blood collection tubes for medical testing. Proper storage of blood samples is crucial for isolating nucleic acids and ensuring the performance of downstream assays in molecular diagnostics. While guidelines for storing specimens intended for genomic DNA (gDNA) isolation are lacking, studies have shown that EDTA tubes stored at 4 °C are optimal for long-term storage. Interestingly, when it comes to storing EDTA solutions, it is recommended to use plastic containers instead of glass bottles. This is because EDTA stored in plastic bottles has been found to remain stable for up to 12 months without significant changes.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Container type | Plastic |
| Container material to avoid | Glass |
| Storage conditions | Cool, dry place, out of sunlight |
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What You'll Learn
- EDTA solutions can be stored in plastic containers for up to 12 months
- Glass containers are not recommended for storing EDTA
- EDTA blood samples should be stored at 4 °C for long-term storage
- Room temperature storage of EDTA blood samples yields poor-quality gDNA
- EDTA is used to prevent genomic DNA degradation
EDTA solutions can be stored in plastic containers for up to 12 months
EDTA, or ethylenediaminetetraacetic acid, is a synthetic amino acid and a common chelating agent. It is widely used in various applications, including molecular biology, clinical chemistry, and agriculture. Proper storage of EDTA solutions is important to ensure the stability and effectiveness of the compound over time.
Plastic containers are suitable for storing EDTA solutions due to their inert nature. Plastic is generally non-reactive and resistant to corrosion, which helps maintain the integrity of the EDTA solution. Additionally, plastic containers are often lightweight, durable, and inexpensive, making them practical choices for storage.
When storing EDTA solutions in plastic containers, it is important to follow certain guidelines to ensure optimal preservation. The containers should be kept in a cool, dry, and dark place, such as a laboratory cabinet or a storage room with controlled temperature and humidity conditions. Direct sunlight and extreme temperatures should be avoided as they can degrade the EDTA over time.
Proper handling and storage of EDTA solutions are crucial to maintain their quality and effectiveness. By storing EDTA solutions in plastic containers and adhering to the recommended storage conditions, users can ensure the stability and longevity of the EDTA for up to 12 months.
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Glass containers are not recommended for storing EDTA
Furthermore, glass containers are typically more fragile and prone to breakage compared to plastic containers, which could pose a safety hazard in a laboratory setting. Plastic containers are generally more durable and impact-resistant, reducing the risk of accidental spills or contamination.
Another consideration is the potential for chemical interaction between the EDTA solution and the glass container. While glass is generally inert, there may be specific types of glass that could interact with the EDTA, affecting its stability or purity. Plastic containers, on the other hand, are often made of inert polymers that are highly resistant to chemical reactions, ensuring the integrity of the EDTA solution.
Additionally, plastic containers are often more lightweight and easier to transport than glass containers, especially when it comes to large-volume storage. This can be advantageous in laboratory settings where space optimization and ease of handling are important factors.
Lastly, plastic containers are generally more affordable and widely available than glass containers, making them a cost-effective and accessible option for storing EDTA. Glass containers may be more expensive and less readily available, especially for specialized laboratory glassware. Therefore, for practical and economic reasons, plastic containers are often the preferred choice for storing EDTA solutions.
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EDTA blood samples should be stored at 4 °C for long-term storage
Recommendations from various studies suggest that blood samples intended for nucleic acid isolation should be stored in EDTA tubes at 4 °C for long-term storage, typically exceeding 10 days. Storing EDTA blood samples at this temperature helps maintain the quality of the genomic DNA (gDNA) over time.
At room temperature, the quality of gDNA decreases, and samples with high %Ti (a measure of gDNA degradation) generate lower levels of high molecular weight amplicons, impacting the quality of downstream data. Laboratories should consider these factors when establishing policies for sample acceptance and storage conditions to ensure optimal gDNA isolation and analysis.
Additionally, EDTA blood samples can be stored for shorter periods at 4 °C before processing. For example, they can be stored for 12, 24, or 36 hours prior to processing at 4 °C. They can also be frozen at −80 °C for 20 days and then thawed under controlled conditions.
It is important to note that EDTA-supplemented whole blood should not be frozen at any time before processing, according to specific guidelines for virus isolation. Furthermore, guidelines for the storage and handling of specimens for gDNA isolation in clinical laboratories are still evolving, and laboratories should consider multiple factors when updating their sample acceptance policies.
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Room temperature storage of EDTA blood samples yields poor-quality gDNA
EDTA, or ethylenediaminetetraacetic acid, is a chelating agent that binds to metal ions and is commonly used in blood collection tubes to prevent coagulation. While plastic containers are commonly used for storing EDTA, the focus of this discussion is on the impact of room temperature storage on the quality of gDNA in EDTA blood samples.
Room temperature storage of EDTA blood samples can indeed yield poor-quality gDNA. The quality of genomic DNA (gDNA) is crucial for genetic testing and downstream assays in molecular diagnostics. Proper storage of whole blood is essential to ensure successful isolation of gDNA and adequate performance in subsequent analyses. However, guidelines for the storage and handling of specimens for gDNA isolation are often lacking, which can impact the quality of the extracted gDNA.
In a study by Bulla et al. (2016), researchers investigated the yield and quality of gDNA extracted from whole blood stored at different temperatures, including room temperature, both with and without a preservative agent. They found that EDTA whole-blood samples stored at room temperature showed a progressive decrease in DNA extraction yield over time. This decrease was slower when stored at lower temperatures, such as 4°C. Additionally, the type of container (EDTA or heparin) and storage duration also influence the quality of gDNA isolates.
To ensure high-quality gDNA isolates, it is recommended that blood samples intended for nucleic acid isolation be stored in EDTA tubes at 4 °C for long-term storage, typically exceeding 10 days. For room temperature storage, regardless of the container type, gDNA should be extracted within 3 days to maintain acceptable quality. Heparinized samples stored at room temperature tend to yield the poorest quality gDNA.
Laboratories conducting molecular genetic testing should consider these factors when updating their policies for sample acceptance and gDNA extraction. By optimizing storage conditions, such as temperature and container type, the quality and integrity of gDNA isolates can be improved, leading to more reliable and accurate downstream analyses.
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EDTA is used to prevent genomic DNA degradation
EDTA is a common component of DESS, a formulation widely used to preserve DNA in biological tissue samples. DESS contains three ingredients: dimethyl sulfoxide (DMSO), ethylenediaminetetraacetic acid (EDTA), and sodium chloride (NaCl). EDTA is used to prevent genomic DNA degradation by chelating ions required for nuclease activity.
Nucleases can hydrolyze DNA, compromising its stability and leading to degradation. EDTA acts as a nuclease inhibitor, preventing the digestion of DNA by blocking the activity of these enzymes. This is particularly important during DNA extraction and isolation procedures, where cells and compartments are homogenized, creating conditions that can potentially damage DNA.
EDTA is also used in DNase treatment after RNA extraction to inactivate DNase and prevent genomic DNA contamination. In this context, EDTA is added as a STOP solution to inactivate DNase and halt the reaction. However, there are some concerns that EDTA may affect the quality of q-PCR results and impact downstream enzymes such as reverse transcriptase.
Additionally, EDTA has been shown to protect high molecular weight DNA in tissue preservative solutions like DESS. It is also used to preserve DNA in blood samples, inhibiting DNase activity and preventing ex vivo degradation. EDTA is advantageous in this application due to its low cost, ease of use, safety profile, and lack of restrictions on shipping.
Overall, EDTA plays a crucial role in preventing genomic DNA degradation by inhibiting nucleases and protecting DNA integrity during various laboratory procedures and preservation techniques.
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Frequently asked questions
EDTA is stored in plastic containers because it is not suitable for storage in glass containers. It is recommended to store EDTA in a cool place and out of sunlight.
EDTA is used in the storage of blood samples for genomic DNA (gDNA) isolation.
The ideal temperature for storing EDTA blood samples intended for nucleic acid isolation is 4 °C for long-term storage (more than 10 days).
