Manual Magnetic Bead Extraction in Winter: Key Precautions for Low-Temp Handling

序文

When manually using magnetic bead – based nucleic acid extraction reagents in cold winter, special attention should be paid to the impact of temperature on reagent activity, magnetic bead adsorption efficiency, and experimental operations. The specific precautions are as follows:

1. Reagent Rewarming in Advance

Reagents such as magnetic bead suspensions, lysis buffers, and washing buffers are prone to component precipitation or magnetic bead aggregation at low temperatures. Take them out of the refrigerator 15 – 30 minutes in advance, let them rewarm at room temperature, and gently invert and mix them. Avoid violent shaking to prevent magnetic beads from breaking.

2. Maintain a Stable Operating Environment Temperature

Try to operate in a laboratory with a room temperature of 18 – 25℃. Avoid areas directly blown by cold air, 空気などの – conditioner outlets and doors and windows. If the ambient temperature is too low, use a constant – temperature metal bath or water bath to maintain the temperature of samples and reagents, preventing a decrease in the efficiency of the lysis buffer and insufficient binding between DNA and magnetic beads.

3. Control Time in Magnetic Bead Adsorption and Separation Steps

Low temperatures will slow down the binding speed of magnetic beads and nucleic acids. Appropriately extend the incubation time of magnetic beads (usually increase by 5 – 10 分). 同時に, when separating magnetic beads on the magnetic stand, the sedimentation speed of magnetic beads slows down at low temperatures. Prolong the standing time to ensure that the magnetic beads are completely adsorbed on the tube wall before discarding the waste liquid to avoid the loss of magnetic beads.

4. Optimize the Temperature of the Eluent

The temperature of the eluent directly affects the nucleic acid elution efficiency. In winter, pre – warm the eluent to 50 – 65℃ before use. Briefly vortex and mix during elution and let it stand for 2 – 3 minutes to improve the nucleic acid recovery rate. The eluted nucleic acid sample should be stored at a low temperature as soon as possible to prevent degradation.

5. Operational Details and Consumable Preparation

Pre – warm the pipette in advance to avoid inaccurate liquid aspiration by the pipette at low temperatures. Use enzyme – free centrifuge tubes and pipette tips to prevent the loss of nucleic acids adsorbed on the surface of consumables in a low – temperature environment. Operate gently to reduce reagent volatilization and sample contamination.

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