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For long term oligo storage, temperature is the most important factor to consider. For long term storage, whether oligos are dried down, or resuspended in non-DEPC treated water or TE buffer (10 mM Tris pH 8.0, 0.1 mM EDTA; such as IDTE), we recommend that you store your oligos at –20°C.
For 4°C storage, oligos are stable for at least 60 weeks when stored dry, or resuspended in non-DEPC treated water or TE buffer (10 mM Tris pH 8.0, 0.1 mM EDTA; such as IDTE).
It is also important to note that for DNA oligos, an acidic pH can induce depurination, therefore maintaining a neutral pH is important. For RNA oligos a neutral pH is also important, as basic pH buffers can induce RNA breakdown.
Please see the DECODED, Storing oligos: 7 things you should know, for data on oligonucleotide storage and a more thorough explanation.