MagPure Plasmid EF Mini Kit

MagPure Plasmid EF Mini Kit serves as the core low-endotoxin magnetic bead product within the Magen plasmid DNA extraction portfolio. It isolates up to 15 µg low-endotoxin plasmid DNA from 1–5 mL bacterial culture and supports both manual and automation-oriented processing. High-salt-mediated plasmid binding can be combined with magnetic bead-based impurity removal, making the workflow particularly suitable for medium- to low-copy vectors where reduced RNA carryover and more representative OD-based concentration measurements are important.

Within the low-endotoxin magnetic branch, MagPure Plasmid EF Midi Kit (High Copy) (P1815) extends the system toward higher-output preparation from high-copy vectors, while MagPure Plasmid EF Midi Kit (Medium/Low Copy) (P1816) provides a larger-scale high-salt route with stronger RNA control. Laboratories requiring standard molecular biology-grade plasmid DNA rather than transfection-grade preparation should refer to MagPure Plasmid Mini Kit (P1811)

Engineering Characteristics

Salt-mediated low-endotoxin purification

The MN4-based salt-mediated binding system combines magnetic plasmid capture with PW1 and EWB washing to support low-endotoxin plasmid DNA preparation for cell-transfection workflows. The chemistry is particularly suited to medium- and low-copy plasmids where RNA background can otherwise affect concentration measurements.

Adjustable sample and capture capacity

The routine workflow processes 1–5 mL bacterial cultures, while low-copy plasmid cultures can be increased to 15 mL using proportionally adjusted lysis and neutralization buffers. Magnetic particle input can also be adjusted from 20 to 30 µL according to the expected plasmid yield.

Multiple lysate-clarification routes

Neutralized lysates can be clarified by conventional centrifugation, centrifugal filtration, vacuum filtration or magnetic bead-assisted impurity removal. This allows laboratories to select the clarification method according to available equipment, throughput and automation requirements.

Manual and automated configurations

The same purification system supports single-tube manual extraction and 96-channel automated processing. Prefilled 48- and 96-preparation formats are available, and the automated magnetic extraction stage can be completed in approximately 30 minutes after clarified lysate transfer.

Technical Validation

The automated extraction performance of the MagPure Plasmid EF Mini Kit was evaluated on the MagMix 96 platform using preloaded 96-well plates. Overnight high- and low-copy E. coli cultures were processed using the salt-mediated workflow, followed by an 80 µL elution. PW1 and LMN5 were evaluated as alternative first-wash conditions.

For high-copy plasmids, 2.5 mL culture inputs produced 11.48–11.94 µg with PW1 and 12.05–12.30 µg with LMN5. Increasing the culture input to 5 mL increased yields to 22.34–22.79 µg and 22.68–23.26 µg, respectively. Mean yields increased from approximately 12 µg to more than 22 µg as the culture input doubled, while replicate CVs remained between 0.9% and 1.6%.

Using 5 mL of low-copy bacterial culture, mean plasmid DNA yields were 6.12 µg with PW1 and 6.06 µg with LMN5. Replicate CVs were 2.1% or lower, with A260/A280 values of 1.95–1.97 and A260/A230 values of 1.90–2.21. The closely aligned results indicate that either wash configuration can support reproducible low-copy plasmid recovery under the evaluated conditions.

Agarose gel electrophoresis showed discrete plasmid bands from both high- and low-copy cultures without evident degradation-related smearing or visible low-molecular-weight RNA background. Together, the results support consistent automated plasmid DNA recovery and effective RNA background control across different culture inputs and plasmid copy-number profiles.

Kit Contents

Storage and Stability

RNase A and MagPure Particles should be stored at 2-8°C upon arrival. However, short-term storage (up to 24 weeks) at room temperature (15-25°C) does not affect its performance. The remaining kit components can be stored dry at room temperature (15-25°C) and are stable for at least 24 months under these conditions. After addition of RNase A, Buffer P1 is stable for 6 months when stored at 2-8°C.

For guidance on selecting between standard and low-endotoxin plasmid workflows based on copy number, culture input and processing format, please refer to the Plasmid DNA Kits Purchase Guide.