TE Buffer or DNase/RNase free water?

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Hanna Alalam

Water should be fine. TE is recommended to keep the primer stable for a longer period.

Md. Mahmudul Hasan

Dear Dr. Hanna Alalam , thank you so much.

How many years I can preserve in water ?

If its frozen I have used primers that are 3-4 years old. However observe that if frozen in water they are susceptible to chemical degradation hence if you plan them to use for a really long time, freezing in TE is optimal since then you can keep using them for much longer ~10 years.