Principle and Composition

Virus Preservation Solution (Inactivated, Guanidine, Pink), catalog number I1529459, is formulated with guanidine salts as the active inactivating agent. Guanidine is a potent chaotropic agent that disrupts hydrogen bonding within viral protein structures, leading to rapid denaturation of envelope proteins and nucleocapsid components. This denaturation effectively inactivates enveloped and many non-enveloped viruses at the point of collection, reducing biosafety risk during transport and laboratory processing.

The pink colorant incorporated into the solution serves as a visual identification aid, allowing laboratory personnel to distinguish this inactivating medium from non-inactivating viral transport media (VTM) and to confirm adequate sample immersion. The chaotropic environment also stabilizes viral nucleic acids (RNA and DNA) by inhibiting RNase and DNase activity, helping to preserve nucleic acid integrity for downstream molecular assays such as RT-PCR and qPCR.

Sample Collection Protocol

Materials required: Appropriate swab (e.g., nasopharyngeal, oropharyngeal, or other specimen swab as dictated by study design), collection tube containing Virus Preservation Solution (Inactivated, Guanidine, Pink), personal protective equipment (PPE) appropriate to local biosafety guidelines.

Procedure:

1. Label the collection tube with sample ID, collection date, and time prior to specimen collection.
2. Don appropriate PPE. Follow institutional biosafety protocols for specimen collection.
3. Collect the specimen using the appropriate swab technique for the target specimen type.
4. Immediately immerse the swab tip into the collection tube containing the preservation solution. Ensure the swab tip is fully submerged in the pink solution.
5. Break or cut the swab shaft at the designated score line and secure the tube cap tightly.
6. Gently vortex the tube for 5–10 seconds to elute the specimen into the solution.
7. The sample is now inactivated and suitable for transport at ambient temperature for short durations or refrigerated (2–8 °C) for longer periods. Refer to product label for validated transport and storage conditions.

Note: Once the sample is immersed in the guanidine-containing solution, the specimen is considered chemically inactivated; however, always follow institutional and regulatory biosafety guidelines.

Storage, Transport, and Stability

Unopened reagent storage: Store the unopened Virus Preservation Solution (Inactivated, Guanidine, Pink) according to the conditions stated on the product label and certificate of analysis. Protect from direct light exposure. Keep away from heat sources.

Collected samples: Once specimens have been collected into the preservation solution, samples should be transported and processed according to validated conditions. As a general guideline for guanidine-based inactivating media, refrigerated storage at 2–8 °C is recommended when samples cannot be processed immediately. For extended storage, consult the product documentation or contact Aladdin Scientific technical support for validated stability data.

Freeze-thaw: Repeated freeze-thaw cycles should be avoided as they may compromise nucleic acid integrity. If long-term archival storage is required, aliquot samples prior to freezing.

Review flag: Specific validated storage durations and temperature ranges for collected samples in this product have not been confirmed from the source material and should be verified against the product's certificate of analysis (CoA) or technical data sheet (TDS).

Downstream Nucleic Acid Extraction Compatibility

The guanidine chaotropic environment within Virus Preservation Solution (Inactivated, Guanidine, Pink) is directly compatible with many silica-membrane–based nucleic acid extraction kits, as guanidine salts facilitate nucleic acid binding to silica in the presence of chaotropic conditions. This can streamline the extraction workflow by eliminating the need for a separate lysis step when using compatible kits.

Recommended practice:

• Verify compatibility of this preservation solution with your specific extraction kit prior to use. Consult the extraction kit manufacturer's instructions for guidance on guanidine-containing input samples.
• Adjust input sample volumes as recommended by the extraction kit to avoid carryover of guanidine that could inhibit downstream enzymatic reactions (e.g., PCR).
• Include appropriate positive and negative controls in each extraction run to monitor for inhibition or contamination.

For RT-PCR or qPCR applications, confirm that extracted nucleic acid concentrations and purity (A260/A280 and A260/A230 ratios) meet the requirements of the downstream assay.

Safety and Disposal

Hazard information: This product contains guanidine salts, which are classified as irritants. Avoid contact with skin, eyes, and mucous membranes. In case of contact, rinse thoroughly with water. Refer to the Safety Data Sheet (SDS) for complete hazard classification, first-aid measures, and handling precautions. The SDS is available from Aladdin Scientific upon request or via the product page.

Inactivated samples: Although the guanidine-based formulation chemically inactivates viral pathogens, treat all samples as potentially infectious until inactivation has been validated for the specific pathogen under your institutional biosafety protocol. Follow local, national, and institutional regulations for the disposal of biological and chemical waste.

Waste disposal: Dispose of used collection tubes, swabs, and residual solution in accordance with applicable regulations for chemical and biohazardous waste. Do not pour guanidine-containing solutions down the drain without confirming compliance with local effluent regulations.