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Pouring and Running a Protein Gel by reusing Commercial Cassettes
Published on: February 12, 2012
pK-matched running buffers for gel electrophoresis
Q Liu1, X Li, S S Sommer
1Departments of Molecular Genetics and Molecular Diagnosis, City of Hope National Medical Center, 1500 East Duarte Road, Duarte, California 91010-3000, USA.
Analytical Biochemistry
|May 18, 1999
Summary
New pK-matched electrophoresis buffers offer superior nucleic acid separation. These buffers provide high resolution and stability in agarose and polyacrylamide gels, outperforming standard TAE and TBE buffers.
Area of Science:
- Molecular Biology
- Biochemistry
- Biophysical Chemistry
Background:
- Electrophoresis is a standard technique for nucleic acid separation, identification, and purification.
- Electrophoresis buffer properties like pH, ionic strength, and composition significantly impact performance.
- Current buffers often use a weak acid or base with a dissimilar pK, potentially limiting efficiency.
Purpose of the Study:
- To develop novel pK-matched electrophoresis buffers with enhanced performance.
- To evaluate the efficacy of these new buffers in various gel electrophoresis applications.
- To compare the new buffers against standard TAE and TBE buffers.
Main Methods:
- Development of three pK-matched buffer systems: Ethanolamine/Capso (pH 9.6), Triethanolamine/Tricine (pH 7.9), and Bis-Tris/Aces (pH 6.7).
- Testing buffers on agarose gels for double-stranded DNA fragment separation using various markers, gel concentrations, and field strengths.
- Evaluation in 7 M urea denaturing LongRanger sequencing gels and nondenaturing polyacrylamide SSCP gels.
Main Results:
- pK-matched buffers provided high resolution and reduced smearing at lower concentrations compared to TAE and TBE.
- Mobility of DNA fragments was inversely proportional to the logarithm of molecular weight.
- Buffers demonstrated higher voltage and current stability, lower working concentrations, and reduced heat generation.
Conclusions:
- The developed pK-matched buffers offer improved separation and resolution across a range of pH values.
- These buffers provide greater stability, require lower concentrations, and generate less heat than conventional TAE and TBE buffers.
- The new buffer systems represent a significant advancement for nucleic acid electrophoresis techniques.
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