The quantification standard is genomic DNA extracted from low passage and defined mycoplasma or legionella cultivated in liquid medium according to the European Pharmacopoeia or in Hayflick's medium. The extraction of the DNA is done by column absorption methods and the DNA purified by phenol/chloroform extraction and ethanol precipitation. The concentration was determined photometrically and by real-time PCR. The DNA concentration was adjusted by dilution with DNA stabilizing buffer. Genomic DNA is used as a control template when DNA amplification tests by conventional PCR are performed (e.g. as contamination control in cell culturing). With the real-time PCR technology, this titrated DNA standard with a defined concentration of genome copies is used as calibrator to generate standard curves. Therefore the provided solution is diluted in a 10x dilution series with DNA-free water and used as a PCR sample. With the generated fluorescent data, the software provided with the real-time PCR instrument calculates a standard curve, which can be used to determine the DNA concentration of unknown samples.
1 vial (green cap) of Standard DNA, 100 µl, contains approx. 106 genomes/µl.
3 vials (white cap) with 1 ml of DNA free water.
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