Performance
Streamlined workflow
The QIAxcel Advanced system not only speeds up DNA and RNA analysis by eliminating slab-gel analysis, but also contributes to streamlining the entire sample purification and analysis workflow. Used in combination with proven QIAGEN end-point PCR kits, the QIAxcel Advanced provides an all-in-one, pretested solution for reliable analysis of PCR fragments, ensuring reproducibility and significant time and cost savings.

One instrument, many applications

The QIAxcel Advanced system is a versatile solution for electrophoresis and offers a broad range of applications. Preprogrammed methods, in combination with the corresponding gel cartridges, allow separation and analysis of a variety of nucleic acids — including single or multiple PCR fragments, DNA digested with restriction endonucleases, total RNA, and cRNA. Unlike other commercially available devices that provide processing of only up to 12 samples at time, the QIAxcel Advanced system allows processing of all 96 samples without manual intervention.

DNA analysis

In genotyping applications, the QIAxcel Advanced system enables greater sizing accuracy and more sensitive detection than conventional agarose gel electrophoresis (see figure Accurate, high-throughput genotyping of bacteria). QIAxcel Advanced also provides a straightforward and effective means for checking the quality of genomic DNA (gDNA) samples prior to molecular screening and downstream assays (see figure Assessment of DNA degraded by sonication).

RNA analysis — objective quality values with the RNA Integrity Score

The new QIAGEN RNA Integrity Score (RIS) provides an objective quality measurement for eukaryotic RNA samples and allows easy interpretation of sample integrity. The RIS is a value from 1 to 10 where a value of 10 indicates completely intact RNA (see figure RIS indicates RNA integrity). The highly reproducible RIS eliminates the need for human interpretation and enables the implementation of rigorous quality control at appropriate breakpoints across workflows. This allows researchers to eliminate samples that do not meet the quality criteria required for downstream processes, reducing the risk of needing to repeat experiments and saving time and costs. Such careful monitoring of the initial RNA sample, as well as products generated throughout the entire procedure, is crucial in microarray analysis, since RNA degradation strongly influences the predictive power obtained from the microarray data. The QIAxcel Advanced System is highly suitable for analyzing the integrity of total RNA and size distribution of fragmented or intact cRNA (see figure Streamlined RNA analysis using the QIAxcel system), and the throughput capacity makes it very convenient for laboratories employing 96-well RNA purification technologies that need a fast solution for quality control.

Principle

The QIAxcel Advanced instrument includes an array of light-emitting diodes and micro-optical collectors that latch to capillaries within QIAxcel gel cartridges. Fragments that are migrating through a gel matrix within the capillary pass excitation and detection spots and the signal is transmitted through a photomultiplier tube to the QIAxcel ScreenGel software for data interpretation (see figure Sample separation process). The high detection sensitivity provided by the QIAxcel Advanced instrument enables robust results even with low concentrations of nucleic acid. With a resolution of 3–5 bp for fragments smaller than 0.5 kb, the QIAxcel Advanced system ensures greater accuracy than slab-gel methods, as well as greater confidence in data interpretation. Sample consumption is less than 0.1 μl per analysis, saving precious samples for further downstream analysis. Hands-free sample loading and self-contained components minimize exposure to hazardous chemicals, such as ethidium bromide (see figure Ready-to-run gel cartridges).

Applications

The QIAxcel Advanced System offers a broad range of optimized applications for DNA and RNA analysis and is highly suited for research in academic as well as pharmaceutical, biotechnology, and biomedical laboratories. Preprogrammed methods, in combination with the corresponding gel cartridges, allow separation and analysis of a variety of nucleic acids — including single or multiple PCR fragments, DNA digested with restriction endonucleases, synthesized oligonucleotides, total RNA, and cRNA. The QIAxcel Advanced System has been used for applications such as:

• Bacterial genotyping
• PCR fragment analysis
• Pre-sequencing testing
• Mutation detection
• Detection of food allergens
• Quality control of genomic DNA
• Total RNA and cRNA QC for RT-PCR and microarray analysis