Saliva collection has become one of the most popular methods for obtaining DNA samples for genetic testing, molecular diagnostics, research studies, and biobanking. En comparación con la extracción de sangre, saliva sampling is non-invasive, sin dolor, and suitable for self-collection.
Among the various saliva collection solutions available, split-design saliva collectors offer a convenient and reliable way to collect, preserve, and transport saliva specimens. By separating the collection tube and preservation solution before use, these devices help maintain reagent stability while ensuring easy activation during sample collection.
This guide explains how a split saliva collector works, how to collect a high-quality saliva sample, and how to store the specimen properly for optimal DNA preservation.
What Is a Split Saliva Collector?
A split saliva collector is a saliva collection device designed with separate compartments for saliva collection and preservation solution storage.
Típicamente, the device consists of:
- A saliva collection funnel
- A collection tube
- A preservation solution tube
- A secure sealing cap
Preparation Before Saliva Collection
Proper preparation is essential for obtaining a high-quality DNA sample.
Avoid the Following for 30 Minutes Before Collection
To reduce contamination and improve sample quality:
- Do not eat food.
- Do not drink beverages.
- Do not smoke.
- Do not chew gum.
- Avoid placing anything in your mouth.
These precautions help ensure that the collected saliva contains sufficient intact cells for DNA extraction.
Step-by-Step Saliva Collection Procedure
Paso 1: Open and Inspect the Saliva Collection Kit
Remove the saliva collector from its packaging.
Antes de usar, inspect the device carefully and ensure that:
- The packaging is intact.
- The collection tube is undamaged.
- The preservation solution tube is sealed properly.
Do not use the kit if any component appears damaged or contaminated.
Paso 2: Rinse Your Mouth
Rinse your mouth thoroughly with clean water to remove food particles and debris.
Después de enjuagar, wait approximately 30 minutes before collecting the sample.
This waiting period helps prevent dilution or contamination of the specimen.
Paso 3: Increase the Number of Oral Cells
To improve DNA yield:
- Rub the roof of your mouth with your tongue.
- Rub the lower palate with your tongue.
- Gently scrape your tongue against your teeth.
This process helps release exfoliated epithelial cells into the saliva, increasing the amount of DNA available for testing.
Paso 4: Collect the Saliva Sample
Spit saliva into the collection funnel slowly and naturally.
Continue until the liquid saliva level reaches the 2 mL fill line.
Importante:
Only the liquid saliva should be measured. Bubbles and foam should not be counted as part of the required sample volume.
Paso 5: Add the Preservation Solution
Hold the collector upright.
Carefully unscrew the cap of the preservation solution tube and slowly pour the solution into the collection funnel.
Paso 6: Remove the Funnel
Keeping the collection tube upright, carefully remove the collection funnel by unscrewing it from the tube.
Avoid spilling any sample during this process.
Paso 7: Seal and Mix the Sample
Securely tighten the cap on the collection tube.
Gently invert the tube 5–6 times to ensure complete mixing of:
- Muestra de saliva
- DNA preservation solution
Once mixed, the sample is ready for storage and transportation.
Saliva Sample Storage Requirements
After collection and mixing, proper storage is essential.
Almacenamiento a temperatura ambiente
The stabilized saliva sample can be stored at room temperature for up to:
15 dias
This provides flexibility for sample transportation and laboratory submission.
Refrigerated Storage
For extended storage, keep samples refrigerated at:
2–8°C (35.6–46.4°F)
Under these conditions, DNA stability can be maintained for up to:
3 meses
Para mejores resultados, samples should be shipped to the testing laboratory as soon as possible after collection.
Common Mistakes to Avoid
To ensure accurate DNA testing results, avoid the following errors:
- Eating or drinking before collection
- Collecting insufficient saliva volume
- Counting bubbles as saliva
- Forgetting to add the preservation solution
- Inadequately mixing the sample
- Leaving the tube loosely capped
- Exposing the sample to excessive heat
- Delaying shipment beyond recommended storage periods
Why Choose MEIDIKE GENE Split Saliva Collectors?
MEIDIKE GENE offers professionally designed split saliva collection devices for DNA preservation and molecular testing applications.
Kit desechable de recolección de saliva para autorecolección de muestras de ADN/ARN
Características clave
- Split design with separate preservation solution chamber
- Easy self-collection procedure
- Non-invasive and painless sampling
- Reliable DNA stabilization
- Leak-resistant collection tube
- Suitable for transportation and storage
- Available for OEM and ODM customization
- Ideal para clínico, laboratorio, y aplicaciones de investigación
The split-design system helps ensure sample integrity while providing a simple and user-friendly collection experience.
