How do I determine the percentage of full-length oligonucleotide?
The percentage of full-length oligonucleotide depends on the coupling efficiency of the chemical synthesis. The average efficiency is close to 99%. To calculate the percentage of full-length oligonucleotide, use the formula: 0.99n-1 Therefore, 79% of the oligonucleotide molecules in the tube are 25 bases long; the rest are <25 bases. If you are concerned about starting with a preparation of oligonucleotide that is full-length you may want to consider cartridge, PAGE, or HPLC purification.
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