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ZR Plasmid Miniprep™ - Classic

For purification of high quality, endotoxin-free plasmid DNA for restriction endonuclease digestion, DNA sequencing, transformation, cloning, transfection, in vitro transcription reactions, etc.
Innovative colored P1, P2, and P3 buffers for rapid identification of complete bacterial cell lysis and neutralization steps.
Unique column design: zero buffer retention and low (30 µl) elution volume.

Product Size Catalog # Price Qty
ZR Plasmid Miniprep™- Classic 100 Preps. D4015
ZR Plasmid Miniprep™- Classic 400 Preps. D4016
ZR Plasmid Miniprep™- Classic 800 Preps. D4054

About ZR Plasmid Miniprep™ - Classic

The ZR Plasmid Miniprep™-Classic is designed for efficient isolation of plasmid DNA from E. Coli using a traditional 3-buffer (P1, P2, P3) procedure that is simple, rapid, user-friendly, and reliable. It features a modified alkaline lysis protocol together with a unique Fast-Spin column to yield high quality plasmid DNA in minutes. The buffers are color-coded (red, green, yellow) for easy determination of complete cell lysis and neutralization. The innovative Zymo-Spin™ llN columns yield endotoxin-free plasmid DNA. Plasmid DNA purified using the ZR Plasmid Miniprep™-Classic is well suited for use in restriction endonuclease digestion, sequencing, DNA ligation, cloning, PCR, bacterial transformation, transfection, etc.

Format Spin Column
DNA Recovery ≥ 30 µl
Processing Time 15 min
DNA Purity Plasmid DNA which is well suited for ligation, sequencing, restriction endonuclease digestion, in vitro transcription, and other sensitive applications requiring pure DNA. Typical A(260/280) ≥ 1.8.
Plasmid DNA Size Up to 25 kb.
Plasmid DNA Yield Up to 25 µg per preparation, depending on the plasmid copy number, culture growth conditions, and strain of E. Coli utilized.
Procedure Performed at room temperature (15-30°C) using a centrifuge and/or a vacuum manifold.


Plasmid products. Restriction Endonuclease digestion of three different plasmids prepared using the ZR Plasmid Miniprep™-Classic, performed in triplicate. M: ZR 1 kb DNA marker (Zymo Research)

Sequence-quality DNA preparations. DNA sequencing chromatogram of plasmid DNA prepared using the ZR Plasmid Miniprep™-Classic.

Step 1

Centrifuge 0.5 - 5 ml1,2 of bacterial culture in a clear 1.5 ml tube at full speed for 15 - 20 seconds in a microcentrifuge.  Discard supernatant.

Step 2
Add 200 µl of P1 Buffer (Red) to the tube and resuspend pellet completely (i.e., by vortexing or pipeting).
Step 3

Add 200 µl of P2 Buffer (Green)3 and mix by inverting the tube 2 - 4 times.  Cells are completely lysed when the solution appears clear, purple, and viscous.  Proceed to the next step within 1-2 minutes.

Step 4

Add 400 µl of P3 Buffer (Yellow) and mix gently but thoroughly.  Do not vortex.  The sample will turn yellow when the neutralization is complete4. Allow the lysate to incubate at room temperature for 1-2 minutes.

Step 5

Centrifuge sample(s) for 2 minutes.

Step 6

Place a Zymo-Spin™ IIN column in a Collection Tube and transfer the supernatant from Step 5 into the Zymo-Spin™ IIN column. When pipeting the supernatant be careful not to disturb the green pellet to avoid transferring any cellular debris to the column.

Step 7

Centrifuge the Zymo-Spin™ IIN/Collection Tube assembly for 30 seconds.

Step 8

Discard the flow-through in the Collection Tube, making sure the flow-through does not touch the bottom of the column.  Return the Zymo-Spin™ IIN column to the Collection Tube5.

Step 9

Add 200 µl of Endo-Wash Buffer to the column and centrifuge for 30 seconds.

Step 10

Add 400 µl of Plasmid Wash Buffer6 to the columnCentrifuge for 1 minute.

Step 11

Transfer the column into a clean 1.5 ml microcentrifuge tube and then add 30 µl (of DNA Elution Buffer7 to the column.  Centrifuge for 30 seconds to elute the plasmid DNA.

For specific notes and additional information, please see the product protocol PDF.
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