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PAXgene Blood ccfDNA Tube (RUO)

For collection of whole blood samples and stabilization of ccfDNA

  • Single tube collection, stabilization, transport and storage
  • Formaldehyde-free, non-crosslinking stabilization of circulating, cell-free DNA (ccfDNA)
  • Sample transport and storage for up to 10 days at temperatures up to 25°C, 7 days at temperatures up to 30°C, or 3 days at temperatures up to 37°C. Do not store blood-filled tubes below 2°C.
  • Standardized preanalytical processing of samples
  • Integrated system with QIAsymphony PAXgene Blood ccfDNA Kit

Feature

Specification

Tube size

16 x 100 mm

Blood draw volume

10 mL

Additive Volume

1.5 mL

Length of stabilization

  • 2 - 37°C for up to 3 days
  • 2 - 30°C for up to 7 days
  • 2 - 25°C for up to 10 days

Do not store blood-filled tubes below 2°C.

Closure type/color

Pearl white BD Hemogard/
Blue stopper

Quantity

100 tubes/case


Further application data for multianalyte research

See here our studies on:

Cell-free RNA, cell-free DNA and gDNA from a single blood sample (poster link)
CTC RNA, cell-free DNA and gDNA from a single blood sample (poster link)


Intended Use

The PAXgene Blood ccfDNA Tube is a plastic, closed, evacuated tube for the collection, anticoagulation, transport and storage of human whole blood samples and the stabilization of ccfDNA. The tube is to be used in conjunction with the QIAsymphony PAXgene Blood ccfDNA Kit, the QIAGEN QIAamp MinElute ccfDNA Kit or the QIAGEN QIAamp Circulating NA Kit, to isolate ccfDNA for downstream analytical assays.

For Research Use Only. Not for use in diagnostic procedures. The performance characteristics of this product have not been fully established.

Order information

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PAXgene Blood ccfDNA Tube (RUO)

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Details

Performance

PAXgene Blood ccfDNA Tubes simplify the collection and processing of whole blood for subsequent purification of circulating, cell-free DNA (ccfDNA). The tube additive is non-crosslinking, free of formaldehyde-releasing substances, stabilizes blood cells (Figure 1 and Figure 2) and prevents apoptosis (Figure 3). Consequently, using PAXgene Blood ccfDNA Tubes for whole blood collection, storage and transport helps prevent the release of intracellular DNA into plasma (Figure 4).

ccfDNA levels are stable for up to 10 days at temperatures up to 25°C, 7 days at temperatures up to 30°C, or 3 days at temperatures up to 37°C prior to processing. Do not store blood-filled tubes below 2°C.

Thus, blood samples can be transported and stored at room temperature to process plasma later (Figure 5).

Plasma generated from whole blood collected into PAXgene Blood ccfDNA Tubes and processed with the QIAsymphony PAXgene Blood ccfDNA Kit the QIAGEN QIAamp MinElute ccfDNA Kit or the QIAGEN QIAamp Circulating Nucleic Acid Kit, yields high-quality ccfDNA for downstream analytical assays, including but not limited to PCR based assays and next-generation sequencing (NGS).

Principle

The PAXgene Blood ccfDNA Tube is a plastic, closed, evacuated tube for the collection, anticoagulation, transport and storage of human whole blood samples and the stabilization of ccfDNA. The tube contains an additive that anticoagulates blood and stabilizes blood cells via a non-crosslinking stabilization solution. This helps prevent the release of intracellular DNA into the plasma and maintains constant ccfDNA levels during sample transport and storage before processing.

Procedure

The PAXgene Blood ccfDNA Tube allows collection of 10 ml whole blood into a closed, evacuated device that contains a proprietary ccfDNA stabilization additive. Using standard venipuncture technique, blood is collected into an evacuated tube that contains 1.5 mL cell stabilization additive resulting in a ratio of 0.15 ml additive per 1 mL blood. After collection, the whole blood sample can be stored for up to 10 days at temperatures up to 25°C, 7 days at temperatures up to 30°C, or 3 days at temperatures up to 37°C prior to processing. Do not store blood-filled tubes below 2°C.

After tube centrifugation, ccfDNA isolation from plasma is carried out using automated or manual ccfDNA isolation methods based on magnetic-bead or silica-membrane technologies, respectively. The remaining total cellular fraction, or buffy coat, can be used to isolate gDNA using automated or manual DNA isolation methods based on bead or silica membrane technologies, respectively (see Supplementary Protocols).

Customized protocols also allow for automated primary tube handling, eliminating the need to manually transfer plasma from PAXgene Blood ccfDNA Tubes to processing tubes (see Save Time and Resources – Primary Tube Handling Using the PAXgene Blood ccfDNA Tube).

Applications

ccfDNA purified from plasma generated from whole blood collected in PAXgene Blood ccfDNA Tubes can be used in a wide range of downstream applications, such as:

  • PCR, including digital, multiplex and quantitative real-time PCR, and methylation-based assays
  • Next-generation sequencing
Whole blood was stored in EDTA tubes or PAXgene Blood ccfDNA Tubes. Hemolysis was determined by measuring the absorption of free hemoglobin in plasma from 6 subjects at 414 nm. Mean absorption and standard deviation are shown. Amount of hemolysis increased with each additional storage time point in the EDTA tubes but remained relatively constant in the PAXgene Blood ccfDNA additive.

Figure 1. PAXgene Blood ccfDNA stabilization reagent helps prevent hemolysis allowing for clear distinction between plasma and cell fractions.

Whole blood was stored in EDTA tubes or PAXgene Blood ccfDNA Tubes. Hemolysis was ...
Whole blood from 20 subjects was collected into PAXgene Blood ccfDNA Tubes, EDTA tubes and blood collection tubes designed for ccfDNA stabilization from 2 other suppliers. Plasma was separated directly after blood draw, after 3 days and after 7 days storage at room temperature (15–25°C). Hemolysis was assessed by measuring plasma free hemoglobin (pfHb) using the Catachem Plasma Free Hemoglobin (PFH) Kit on the Beckman Coulter DxC analyzer. Increase in sample hemolysis during sample storage at room temperature was minimized in PAXgene Blood ccfDNA Tubes  compared to the other blood collection tubes. This indicates red blood cell lysis and decreased sample integrity in the alternative blood collection tubes.

Figure 2. PAXgene Blood ccfDNA stabilization minimizes hemolysis compared to alternative solutions.

Whole blood from 20 subjects was collected into PAXgene Blood ccfDNA Tubes, EDTA ...
Whole blood from 2 subjects was stored in PAXgene Blood ccfDNA Tubes and EDTA tubes. Genomic DNA was extracted from whole blood samples using the QIAamp Blood Mini Kit immediately after blood collection and after 10 days of storage. Agarose gel electrophoresis was used for size separation of 400 ng extracted gDNA. Fragmentation was evident in the gDNA extracted from whole blood stored for 10 days in EDTA tubes but was practically absent from the samples stored in PAXgene Blood ccfDNA Tubes.

Figure 3. PAXgene Blood ccfDNA stabilization helps prevent apoptosis of blood cells and fragmentation of gDNA in whole blood.

Whole blood from 2 subjects was stored in PAXgene Blood ccfDNA Tubes and EDTA ...
Whole blood was stored in EDTA tubes or PAXgene Blood ccfDNA Tubes. ccfDNA was extracted from the plasma immediately following blood collection (t0) or after 6 days storage (t6) at room temperature (15–25°C). Eluate (1 µl) was analyzed using the Agilent High Sensitivity DNA Kit. Plasma from EDTA tubes showed an increase in apoptotic gDNA fragments, whereas plasma from PAXgene Blood ccfDNA Tubes showed a ccfDNA profile comparable to day 0.

Figure 4. PAXgene Blood ccfDNA stabilization reagent helps prevent release of gDNA into plasma.

Whole blood was stored in EDTA tubes or PAXgene Blood ccfDNA Tubes. ccfDNA was ...
Whole blood from 8 subjects was collected into EDTA tubes (unstabilized) and PAXgene Blood ccfDNA Tubes (stabilized). Samples were stored for 1 day at 35°C (t1, 35°C), for 6 days at room temperature (15–25°C; t6) or, to simulate transport, continually inverted for 5 hours and then stored horizontally for 6 days at room temperature (t6sim). ccfDNA was extracted from plasma using the QIAsymphony SP Protocol for the PAXgene Blood ccfDNA System and ccfDNA yield was quantified by real-time PCR (18S rDNA gene, 66 bp, 180 bp and 500 bp amplicons). Shown is the average ratio of copy numbers at testing time (tx) to copy numbers immediately after blood draw (t0), plus standard deviation. The ratio remained close to 1 in all treatments of the samples stabilized in PAXgene Blood ccfDNA Tubes, indicating the 18S rDNA copy number did not change over time. A significant increase in 18S rDNA copy number was observed in the EDTA samples after storage, indicating release of gDNA.

Figure 5. PAXgene Blood ccfDNA stabilization helps prevent release of gDNA into plasma during storage and transport.

Whole blood from 8 subjects was collected into EDTA tubes (unstabilized) and ...

ccfDNA quality, multimodal analysis and stabilization chemistry  -

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