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I bound an 11 kb DNA fragment to a QIAquick column; is it completely lost?
Larger DNA fragments bind more tightly to the QIAquick columns. It is difficult to predict whether a DNA fragment larger than 10 kb can be efficiently recovered, because this depends on base composition as well as fragment size. If the fragment is only a few kb larger than the 10 kb limit, it can be helpful to heat the elution buffer EB to 60°C and let it incubate on the column for a few minutes before centrifuging. However, please note that it will become less likely to recover your sample the larger the fragment size is. As we cannot guarantee recovery of fragments larger than the maximum cutoff size, we do not recommend to purify such fragments using QIAquick Kits.
The QIAEX II Kit can be used to extract DNA fragments up to 50 kb from agarose or polyacrylamide gels.
Related products
QIAquick PCR Purification Kit
The QIAquick PCR Purification Kit provides spin columns, buffers, and collection tubes for silica-membrane-based purification of PCR products >100 bp. DNA of up to 10 kb is purified using a simple and fast bind-wash-elute procedure and an elution volume of 30–50 μl. An optional pH indicator allows easy determination of the optimal pH for DNA binding to the spin column. The procedure can be fully automated on the QIAcube Connect.
For optimal results it is recommended to use this product together with QIAvac 24 Plus.
QIAquick PCR Purification standard protocols can also be executed using the TRACKMAN Connected system, paired with PIPETMAN M Connected pipettes, both from Gilson. The TRACKMAN Connected system guides researchers through the QIAquick PCR Purification protocols while automatically adjusting the Bluetooth-enabled PIPETMAN M Connected pipette settings. Each step of the protocol execution is recorded to accelerate reporting by generating a comprehensive run report. Download more information.
QIAquick Nucleotide Removal Kit
The QIAquick Nucleotide Removal Kit provides spin columns, buffers, and collection tubes for silica-membrane-based purification of oligonucleotides and DNA. Unincorporated nucleotides, salts, and other contaminants are removed and oligonucleotides (>17 nt) and DNA fragments ranging from 40 bp to 10 kb are purified using a simple and fast bind-wash-elute procedure and an elution volume of 30–200 µl. The procedure is fully automated on the QIAcube Connect.
QIAquick Gel Extraction Kit
The QIAquick Gel Extraction Kit provides spin columns, buffers, and collection tubes for silica-membrane-based purification of DNA fragments from gels (up to 400 mg slices) or enzymatic reactions. DNA ranging from 70 bp to 10 kb is purified using a simple and fast bind-wash-elute procedure and an elution volume of 30–50 µl. An integrated pH indicator allows easy determination of the optimal pH for DNA binding to the spin column. The QIAquick PCR & Gel Cleanup Kit also provides buffers for purification of PCR products >100 bp and DNA of up to 10 kb. The procedure can be fully automated on the QIAcube Connect.
For optimal results it is recommended to use this product together with QIAvac 24 Plus.
QIAquick 96 PCR Purification Kits
QIAquick 96 PCR Purification Kits provide 96-well plates, buffers, and collection tubes for high-throughput silica-membrane-based purification of PCR products >100 bp in size. DNA up to 10 kb is purified using a simple and fast bind–wash–elute procedure and an elution volume of 60–80 µl (resulting in an eluate volume of 40–60 µl). The cleanup procedure can be fully automated on the BioRobot Universal workstation using the QIAquick 96 PCR BioRobot Kit.
QIAEX II System
The QIAEX II system provides a suspension of silica particles to which DNA fragments bind in the presence of chaotropic salts. QIAEX II Suspension is added to solutions or solubilized agarose gel slices and binds DNA. The particles are collected by a brief centrifugation, washed and DNA of 40 bp to 50 kb is eluted in Tris buffer or water.