Midiprep Kits

<h2>What are plasmid midiprep kits?</h2>
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A plasmid midiprep kit scales SDS/alkaline lysis and silica-membrane column binding (or anion-exchange resin with gravity flow) to 150-300 ml of overnight E. coli culture, recovering 0.5-2 mg of plasmid DNA with lysate clearing accomplished by high-speed centrifugation followed by a clearing column or filtration step, completable in as little as 30 minutes for some spin/vacuum formats. Related entities include high-speed centrifugation for lysate clearing, NucleoSnap-type midi formats, endotoxin removal washes, and downstream applications including moderate-scale transfection and multi-reaction restriction/sequencing work. Choose midiprep when miniprep yields (up to ~25-100 ug) aren't sufficient, but full maxiprep-scale culture volume (100-500 ml) and processing time aren't necessary.
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<h2>What you will find:</h2>
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<ul>
<li dir="ltr" role="presentation">Rapid 25-minute midiprep kits to bypass lengthy gravity-flow precipitation steps utilizing accelerated column dynamics</li>
<li dir="ltr" role="presentation">Vacuum-assisted syringe-filter plasmid midi modules engineered for rapid and debris-free clearing of lysates without manual pelleting</li>
<li dir="ltr" role="presentation">Endotoxin-free intermediate purification systems for sensitive mammalian cell screening by delivering transfection-grade constructs</li>
<li dir="ltr" role="presentation">High-purity silica spin-column configurations optimized for elution of high-copy vectors&nbsp;</li>
<li dir="ltr" role="presentation">Advanced anion-exchange gravity-flow assemblies provide template purity for downstream sequencing.</li>
</ul>
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<h2>How to choose a plasmid midiprep kit</h2>
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When midiprep fits between mini and maxi
Midiprep format is the right choice when your downstream application needs more DNA than a miniprep provides (roughly 20-100 ug depending on chemistry) but doesn't require the largest maxiprep-scale yields (up to 1 mg or more); 0.5-2 mg from 150-300 ml culture covers many moderate-scale transfection experiments and multi-replicate downstream reactions. If you find yourself running multiple minipreps to pool DNA for a single transfection, a single midiprep is often more efficient.
Lysate clearing method
Midiprep kits clear lysate using high-speed centrifugation followed by a clearing column (spin or vacuum format) or filtration through folded filters in anion-exchange systems; spin/vacuum clearing formats can complete the full protocol in as little as 30 minutes, while gravity-flow anion-exchange systems may take longer but avoid centrifugation steps for the binding/wash/elute portion. Match the clearing method to your lab's available centrifuge capacity (rotor size for 150-300 ml tubes) and time constraints.
Endotoxin-free midiprep options
For transfection of sensitive cell types, endotoxin-free midiprep kits using anion-exchange chemistry can achieve endotoxin removal in a unique washing step without additional incubations, suitable for transfection of highly sensitive cells, vaccination research, or gene therapy applications. If your midi-scale prep feeds directly into sensitive-cell transfection, confirm the kit's endotoxin specification (e.g., below 0.1 EU/ug) against your cell type's documented sensitivity.
Plasmid copy number and culture volume within the midi range
As with miniprep, plasmid copy number affects yield within the midiprep culture volume range - low-copy plasmids may need culture volumes toward the higher end (300 ml) to reach typical midi yields, while high-copy plasmids may reach 1-2 mg even at 150 ml. Plan culture volume within the midi range based on your specific vector rather than defaulting to the kit's maximum stated volume.
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<h2>Specifications context</h2>
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The key specs for midiprep selection are whether 0.5-2 mg from 150-300 ml culture meets your downstream DNA quantity needs without over- or under-scaling, lysate clearing method (centrifugation-based spin/vacuum vs. gravity-flow anion-exchange), and endotoxin status for transfection-sensitive applications. A midiprep completing in as little as 30 minutes via spin/vacuum clearing offers a time advantage over gravity-flow systems while still avoiding the larger culture volumes of maxiprep. Labs whose miniprep yields are consistently insufficient for their transfection protocols typically move to <a href="https://mbpinc.net/reagents/molecular-biology/nucleic-acid-extraction-kits/plasmid-dna-extraction-kits/midiprep-kits">midiprep kits</a>&nbsp;before considering&nbsp;<a href="https://mbpinc.net/reagents/molecular-biology/nucleic-acid-extraction-kits/plasmid-dna-extraction-kits/maxiprep-kits">maxiprep kits</a>, which require substantially more culture volume and processing time. The parent&nbsp;<a href="https://mbpinc.net/reagents/molecular-biology/nucleic-acid-extraction-kits/plasmid-dna-extraction-kits">plasmid DNA extraction kits category</a>&nbsp;and&nbsp;<a href="https://mbpinc.net/reagents/molecular-biology/nucleic-acid-extraction-kits/plasmid-dna-extraction-kits/miniprep-kits">miniprep kits</a>&nbsp;cover smaller-scale options, while the broader&nbsp;<a href="https://mbpinc.net/reagents/molecular-biology/nucleic-acid-extraction-kits">nucleic acid extraction kits hub</a>&nbsp;and&nbsp;<a href="https://mbpinc.net/reagents/molecular-biology/nucleic-acid-extraction-kits/dna-extraction-kits/genomic-dna">genomic DNA extraction kits category</a> link to chromosomal DNA workflows.
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<section class="mbp-contact-cta">
MBP's specialist team can help match kit chemistry, format, and throughput to your sample type and downstream application.&nbsp;<a href="https://mbpinc.net/contact-us">Contact the MBP team</a> for personalized guidance.
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User Manual

Express Endofree Plasmid Midiprep

Manufacturer

Express Endofree Plasmid Midiprep, 2 Preps

Express Endofree Plasmid Midiprep, 10 Preps

Express Endofree Plasmid Midiprep, 25 Preps

Product Literature

Express Plasmid Midiprep Kit ( 25 min)

Express Plasmid Midiprep Kit ( 25 min), 2 Preps

Express Plasmid Midiprep Kit ( 25 min), 10 Preps

Express Plasmid Midiprep Kit ( 25 min), 25 Preps

HP Plasmid Midi Kit

Key to this kit is our proprietary DNA binding systems that allow DNA exclusively and efficiently bind to our ezBindTM matrix while proteins and other impurities are removed by wash buffer. Nucleic acids are easily eluted with sterile water or Elution Buffer.\n

HP Plasmid Midi Kit , 2 Preps

HP Plasmid Midi Kit , 10 Preps

HP Plasmid Midi Kit , 25 Preps

Plasmid Midi Kit I

Plasmid Midi Kit I , 2 Preps

Plasmid Midi Kit I , 10 Preps

Plasmid Midi Kit I , 25 Preps

Plasmid Midi Kit II

Key to the kit is our proprietary DNA binding systems that allow the highly efficient binding of DNA to our ezBindTM matrix while proteins and other impurities are removed by Wash Buffer. Nucleic acids are easily eluted with sterile water or Elution Buffer.\n

Plasmid Midi Kit II , 2 Preps

Plasmid Midi Kit II , 10 Preps

Plasmid Midi Kit II , 25 Preps

ezFlow Endofree Plasmid Midiprep

Key to the kit is our proprietary DNA binding systems that DNA exclusively and efficiently binds to our ezBindTM matrix while proteins and other impurities are removed by wash buffer. Nucleic acids are easily eluted with sterile water or Elution Buffer. Unlike other kits in the markets, no chaotropic salts are contained in the buffer of our patented plasmid purification kit. The purified DNA is guanidine/anion exchange resin residues free.\n