Buffer and sample preparation
Buffer and sample preparation is part of the Nanopore Wiki learning path. Buffer and sample preparation control ionic strength, pH, analyte state, background contaminants, and experimental reproducibility.
Core concepts
- Salt concentration affects conductance, screening, capture, and noise.
- pH changes pore charge, analyte charge, and protein stability.
- Sample aggregation, degradation, solvent carryover, and impurities can dominate signals.
- Preparation date, batch, filtration, and storage conditions should be recorded.
Preparation workflow
| Step | Description |
|---|---|
| 1 | Define buffer composition and target concentration range. |
| 2 | Prepare blank controls and sample dilutions. |
| 3 | Check sample integrity and aggregation risk. |
| 4 | Record all preparation metadata before measurement. |
Typical applications
- DNA, RNA, protein, peptide, particle, and small-molecule nanopore experiments.
- Troubleshooting clogging, adsorption, and inconsistent event rates.
- Sequencing library quality control.
Common pitfalls
- Copying buffer conditions between pore systems without validation.
- Ignoring carrier solvents and salt carryover.
- Using high concentration that causes clogging or overlapping events.