Search Thermo Fisher Scientific
Search Thermo Fisher Scientific
Catalog Number | Quantity | Includes |
---|---|---|
K210005 | 50 Preps | |
K210004 | 25 Preps |
The PureLink™ HiPure Plasmid Midiprep Kit is designed to isolate transfection-grade plasmid DNA from E. coli. The Midiprep Kit protocol will typically yield 100–350 μg plasmid DNA from 15–25 mL bacterial culture, at a purity that is comparable to that achieved by two passes through cesium chloride gradients.
Advantages of the PureLink™ HiPure Plasmid Midiprep Kit include:
Anion-exchange chromatography for plasmid purification
The PureLink™ HiPure Plasmid DNA Purification Kits use a patented anion-exchange resin to purify plasmid DNA to a level equivalent to two passes through CsCl gradients. The resin combines excellent capacity with a fast flow rate, high resolution, high yield, and efficient endotoxin removal. Plasmid preparations can typically be completed in less than 2 hours.
Contaminant-free DNA
Unlike cesium chloride gradient protocols, PureLink™ HiPure Plasmid Purification Systems do not use organic solvents, ethidium bromide, or cesium chloride, all of which are troublesome to work with and to dispose of. Typically, plasmid DNA prepared using the PureLink™ HiPure Plasmid Midiprep Kit will have an A260/A280 ratio of greater than 1.80, indicating that the DNA is reasonably free of proteins that might interfere with downstream applications. Endotoxin levels are typically within 0.1–1 EU/μg, making this plasmid DNA ideal for mammalian cell transfection.
A common problem encountered with absorbance measurements is turbidity of samples. (This could be caused by residual resin from the column.) If there is insoluble material in the cuvette (not often detected by the naked eye), much of the UV light is not absorbed but scattered, leading to an artificially high UV absorbance reading (at 260 or 280 nm, for example.) If your A260 is high, we recommend that you check the A320 to determine if there is resin in the sample. You can also try to centrifuge or filter (0.2 µm filter) your sample to remove any resin and then recheck the concentration.
Yes, we would recommend purchasing the PureLink HiPure BAC Buffer Kit (Cat. No. K210018). This kit includes Resuspension Buffer (R3) (250 ml), Lysis Buffer (L7) (250 ml), Precipitation Buffer (N3) (250 ml), and RNase A (20 µg/ml) (5 ml).
You will need to add less RNase A than stated on the bottle label of the R3 buffer in this kit. It says to add 5.6 mL of RNase A. This is the correct amount for the BAC protocol; however, if you are performing standard plasmid isolation, 1.4 mL RNase A should be added.
The HiPure kits should remove all protein from the DNA including endonucleases. For the silica-based PureLink Quick Plasmid Miniprep Kit, we recommend an extra wash with the optional Wash Buffer W10 to remove endonucleases. This solution is not compatible with the HiPure system and should not be used with those kits. Alternatively, heat the eluted DNA in TE for 10 min at 70 degrees C. This should heat-inactivate any contaminating nucleases.
Extra bands can occur when plasmid DNA is nicked and/or permanently denatured. Plasmid DNA that has been nicked (covalently opened) will run slower than supercoiled DNA during electrophoresis. A small amount of this species of DNA is common and is suitable for downstream applications. Permanently denatured DNA will migrate ahead of the supercoiled DNA and may not be suitable for downstream applications. Do not allow the lysis reaction to proceed longer than 5 minutes.
We have seen this on occasion. The particles do not affect quality of the DNA. Remove the particles by performimg a 1 minute centrifugation at 12,000 x g.
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