As we know that background electrolyte(BGE/ buffer) directly relates to resolution and height of peaks in capillary electrophoresis.
The best material for separating DNA by capillary electrophoresis is probably polydimethylacrylamide. Researchers and contractors at Applied Biosystems tested many different polymers to determine which would provide the best resolution. PDMA is relatively non-absorbing of light. Of course, using fluorescently labeled oligonucleotides would improve the sensitivity significantly.
You can check out https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2782523/ (DNA sequencing by capillary electrophoresis, Karger and Guttman) as well as many other PDMA papers.
If you are looking at fragments rather than sequencing, you might want to look at Ulfelder and McCord, (1996) Capillary Electrophoresis of DNA, in Handbook of Capillary Electrophoresis, edited by J Landers, CRC press. They added intercalating dyes to the buffer. These dyes do not fluoresce unless they are bound to dsDNA. That eliminated the need to derivatize the fragments for sensitive analysis.I hope that this helps.
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