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Home › Learning centers › Nucleic acid purification › Genomic DNA purification › NucleoSpin Plasma XS

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Product overview

NucleoSpin Plasma XS

An ideal solution for purifying circulating DNA from plasma

  • Highly reliable silica membrane technology provides high purity
    Ready to use for real-time PCR
  • Optimized column design yields highly concentrated DNA without a speedvac
    Reduced column membrane area allows elution in only 5–20 µl
  • High recovery for fragments >50 bp
    Ideally suited for fragmented circulating DNA
  • Works with up to 240 µl of plasma
    Ideal solution for routine analyses

Increased amounts of circulating DNA in plasma have been found in a variety of disorders, including cancer, autoimmune diseases, infections, certain fetal diseases, trauma, stroke, and others. Circulating DNA is known to be highly fragmented and low in concentration, which makes it difficult to purify.

NucleoSpin Plasma XS is designed for the isolation of fragmented DNA larger than 50 bp from human EDTA blood plasma. This kit overcomes the limitations of conventional kits: a large membrane diameter associated with large default elution volumes and a resulting DNA concentration which is too low to be directly used as PCR template. NucleoSpin Plasma XS allows you to perform PCR directly on your purified DNA, because it allows elution in only 5–20 µl, resulting in highly concentrated DNA.

Column design  

Optimized column design offers unique advantages

The innovative internal funnel design (Figure 1) allows standard miniprep spin columns to hold a silica membrane of very small diameter. The small diameter of the NucleoSpin Plasma XS membrane allows efficient elution in only 5–20 μl, resulting in highly concentrated DNA that is ready for all typical downstream applications. The ability to purify highly concentrated circulating DNA allows for increased sensitivity and better results.

Design of NucleoSpin Plasma XS column membrane

Figure 1. Design of the NucleoSpin Plasma XS column membrane.

Elution volume depends on membrane diameter

The Xtra Small diameter of the NucleoSpin Plasma XS column membrane (Figure 2) allows efficient elution in only 5–20 μl, compared to at least 20–30 µl using the Competitor Q kit designed for very small samples.

Diameter of NucleoSpin Plasma XS column membrane

Figure 2. The exceptionally small diameter of the NucleoSpin Plasma XS (MN) column membrane is optimized for elution in smaller volumes than a competitor kit (Q).

Protocol overview  

The NucleoSpin Plasma XS procedure

Figure 3. The NucleoSpin Plasma XS procedure.

Fetal DNA detection  

NucleoSpin Plasma XS is ideally suited for the detection of fetal DNA in maternal plasma

Duplex PCR amplification of an RHD fragment (rhesus gene) and an amelogenin fragment specific for the male Y chromosome was used to detect fetal DNA purified from human maternal plasma with either NucleoSpin Plasma XS or a kit from Competitor R (Figure 4). The NucleoSpin Plasma XS kit displayed significantly better performance than the Competitor R kit, as demonstrated by PCR signals that were detectable 2.6 cycles earlier for the RHD fragment and 2.1 cycles earlier for the amelogenin fragment.

More sensitive detection of fetal DNA in maternal plasma

Figure 4. NucleoSpin Plasma XS enables more sensitive detection of fetal DNA in maternal plasma than a competitor kit. DNA was purified from human maternal plasma used for fetal DNA diagnostics with either NucleoSpin Plasma XS or a kit from Competitor R. In each case, DNA from approximately 100 µl of plasma (40% of a NucleoSpin Plasma XS eluate derived from 240 µl of starting material, or 10% of a Competitor R eluate derived from 1,000 µl of starting material) was used for duplex PCR analysis. Amplification of an RHD fragment (rhesus gene) and an amelogenin fragment specific for the male Y chromosome produced 150–180-bp amplicons. PCR signals were detectable 2.6 cycles earlier for the RHD fragment and 2.1 cycles earlier for the amelogenin fragment with the NucleoSpin Plasma XS kit than with the Competitor R kit. Data kindly provided by Dr. Doescher, DRK Blutspendedienst NSTOB, Oldenburg, Germany.

Higher recovery  

Higher recovery of DNA spikes from plasma

When NucleoSpin Plasma XS and a kit from Competitor Q were each used to purify a series of DNA spikes ranging in size from 50–1,000 bp (Figure 5), only the NucleoSpin Plasma XS kit was able to recover fragments smaller than 100 bp, and it showed higher recovery rates of all the remaining fragment sizes than the Competitor Q kit.

Higher recovery of DNA spikes from plasma samples

Figure 5. Higher recovery of DNA spikes from plasma samples than a competitor kit. DNA spikes of 50, 100, 150, 250, and 1,000 bp were mixed with plasma samples. The DNA was subsequently purified with NucleoSpin Plasma XS (MN) and a kit from Competitor Q (Q) in parallel. The Competitor Q kit completely failed to show recovery of fragments smaller than 100 bp and performed more poorly overall compared to NucleoSpin Plasma XS, which showed significantly higher recovery rates.

Better PCR  

Better PCR performance than a competitor midiprep kit

PCR amplification of a 165-bp fragment of the k-ras gene (often involved in cancer) was used to compare DNA purified from rat plasma using NucleoSpin Plasma XS with DNA purified from a larger volume of the same plasma sample using a kit from Competitor Q (Figure 6). The NucleoSpin Plasma XS kit displayed significantly better performance than the Competitor Q kit, as demonstrated by a PCR signal that was detectable 2.1 cycles earlier, even though the PCR input was 2.7-fold greater for the Competitor Q kit.

Better PCR performance with smaller plasma volumes

Figure 6. NucleoSpin Plasma XS provides better PCR performance using smaller volumes of plasma than a competitor midiprep kit. DNA was purified from plasma samples derived from rat EDTA blood using either NucleoSpin Plasma XS (240 µl of starting material) or a kit from Competitor Q (1,000 µl of starting material), and analyzed using PCR amplification of a 165-bp fragment of the k-ras gene. The NucleoSpin Plasma XS sample was purified according to the user manual (high sensitivity protocol), and eluted in a volume of 20 µl, 2 µl of which were used for PCR. The Competitor Q sample was purified according to the user manual, with the following modification: 100 µl of elution buffer was preheated to 56°C and incubated on the membrane for 5 min prior to elution. The elution fraction was concentrated to 30 µl, 2 µl of which were used for PCR. Although the PCR input was 2.7-fold greater for the Competitor Q kit, a PCR signal was detectable 2.1 cycles earlier for the NucleoSpin Plasma XS kit. Data kindly provided by Dolores C. García Olmo, PhD, Unidad de Investigación del Complejo Hospitalario Universitario de Albacete, Albacete, Spain.

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Notice to purchaser

Our products are to be used for Research Use Only. They may not be used for any other purpose, including, but not limited to, use in humans, therapeutic or diagnostic use, or commercial use of any kind. Our products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products or to provide a service to third parties without our prior written approval.

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Notice to purchaser

Our products are to be used for Research Use Only. They may not be used for any other purpose, including, but not limited to, use in humans, therapeutic or diagnostic use, or commercial use of any kind. Our products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products or to provide a service to third parties without our prior written approval.

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Notice to purchaser

Our products are to be used for Research Use Only. They may not be used for any other purpose, including, but not limited to, use in humans, therapeutic or diagnostic use, or commercial use of any kind. Our products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products or to provide a service to third parties without our prior written approval.

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