FuturePAGE™ Precast Protein Gels: Complete User Guide & Troubleshooting FAQ

Introduction

In protein electrophoresis experiments, precast gels have become the preferred choice for many laboratories due to their convenience, stability, and high reproducibility. Biofargo's FuturePAGE™ Precast Protein Gels provide excellent separation performance and broad compatibility for SDS-PAGE applications.

This guide summarizes the most common questions encountered when using FuturePAGE™ Precast Protein Gels and provides practical troubleshooting solutions to help ensure successful experiments.

FuturePAGE™ Precast  Protein Gel Separation Range

Note: The separation ranges shown above correspond to the separation performance obtained using the MOPS running buffer system.

FuturePAGE™ Precast Protein Gel Operating Instructions

• Before use, remove the gold sealing strip at the bottom first, then the comb. Order must not be reversed.
• Flip the tank gasket so the flat side faces outward if leakage occurs.
• Use MOPS-SDS Running Buffer and check for leaks for 2 minutes.
• Recommended loading: Purified proteins (0.1–2 μg); Total lysates (10–15 μg).

Common Troubleshooting Guide

1. System error or bands do not migrate

Possible cause: The bottom sealing strip of the gel was not removed.

Solution: Remove the gold strip at the bottom of the gel before starting electrophoresis.

2. Marker or samples run out of the gel

Possible cause: The electrodes are connected in reverse.

Solution: Check the polarity of the electrophoresis tank and ensure the electrodes are correctly connected.

3. Curved or distorted bands

Possible cause: Leakage in the inner chamber caused by incorrect gel installation.

Solution: Check whether the sealing ring is properly installed and ensure that two gels are mounted at the same height without tilting.

4. Abnormal band migration

Possible cause: Incorrect running buffer was used.

Solution: Use the recommended MOPS running buffer.

5. Comb deformation or bubbles in the gel

Possible cause: Gel freezing damage.

Solution: Store gels at 2–8°C and avoid placing them near refrigerator vents or areas with uneven temperature.

6. High background in Western blot

Possible cause: Incomplete membrane blocking or washing.

Solution: Ensure the membrane is fully immersed during blocking and washing. Avoid stacking multiple membranes together. Thoroughly wash sponges and soak them overnight in pure water before use.

7. “Double ear” bands

Possible cause: Highly viscous samples.

Solution: Reduce sample viscosity by adding nuclease during extraction or applying low-temperature sonication.