DNA purified using the QIAamp DNA Mini Kit can be used in a wide range of downstream applications, including PCR and quantitative real-time PCR, Southern blotting, SNP and STR genotyping, and pharmocogenomic research.

The QIAamp DNA Mini Kit yields DNA sized up to 50 kb (see figure “Purification of up to 50 kb genomic DNA“). DNA of this length denatures completely and has the highest amplification efficiency. Yields of nucleic acids or DNA depend on the starting material (see table).

QIAamp sample preparation technology is fully licensed, allowing QIAamp purified nucleic acids to be used in any molecular assay or other downstream application without risk of patent infringement.

Typical yields with the QIAamp DNA Mini Kit

* Nucleic acids obtained without RNase treatment.
^† Nucleic acids obtained with RNase treatment.

Sample	Amount	Total nucleic acid yields (µg)*	DNA yields (µg)†
Blood	200 µl	4–12	4–12
Buffy coat	200 µl	25–50	25–50
Cells	106	20–30	15–20
Liver	25 mg	60–115	10–30
Brain	25 mg	35–60	15–30
Lung	25 mg	25–45	5–10
Heart	25 mg	15–40	5–10
Kidney	25 mg	40–85	15–30
Spleen	10 mg	25–45	5–30

 

The QIAamp DNA Mini Kit simplifies isolation of DNA from human tissue samples with fast spin-column or vacuum procedures. No phenol–chloroform extraction is required. DNA binds specifically to the QIAamp silica-gel membrane while contaminants pass through. PCR inhibitors, such as divalent cations and proteins, are completely removed in two efficient wash steps, leaving pure DNA to be eluted in either water or a buffer provided with the kit. QIAamp DNA technology yields genomic, mitochondrial, bacterial, parasite, or viral DNA from human tissue samples ready to use in PCR and blotting procedures.

Optimized buffers and enzymes lyse samples, stabilize nucleic acids, and enhance selective DNA adsorption to the QIAamp membrane. Alcohol is added and lysates loaded onto the QIAamp spin column. Wash buffers are used to remove impurities and pure, ready-to-use DNA is then eluted in water or low-salt buffer.

No mechanical homogenization is necessary as the tissues are lysed enzymatically, and the convenient spin-column procedure means that hands-on preparation time is only 20 minutes (lysis times differ according to the sample source). Samples can be processed using either a microcentrifuge or, if blood or other body fluids are being processed, using the QIAvac 24 Plus or QIAvac 6S vacuum manifold. In addition, the rigorous lysis procedure employed makes the QIAamp DNA Mini Kit ideal for purification of genomic DNA from bacteria or parasites. To further reduce hands-on time, genomic DNA purification may be automated on the QIAcube.

Vacuum processing

Blood or other body fluids can be processed by vacuum, instead of centrifugation, for greater speed and convenience in DNA purification. QIAamp Mini spin columns are accommodated on the QIAvac 24 Plus manifold using VacValves and VacConnectors. VacValves should be used if sample flow rates differ significantly, to ensure consistent vacuum. Disposable VacConnectors are used to avoid any cross-contamination. Use of VacConnectors also allows these QIAamp spin procedures to be performed on QIAvac 6S with QIAvac Luer Adapters.

The QIAamp DNA Mini Kit is ideal for purification of DNA from most commonly used human tissue samples, including muscle, liver, heart, brain, bone marrow, and other tissues, swabs (buccal, eye, nasal, pharyngeal, and others), CSF, blood, body fluids, and washed cells from urine. DNA can be purified from up to 25 mg tissue or from up to 200 µl fluid in 20 minutes, and eluted in 50–200 µl.