I have two biotin labeled primer which were synthesised 1.5 years ago. They were not disolved and stored at -20°C. Can I use them for a magnetic bead capture?

If you did not resuspend your oligos and stored them at room temperature in the original lyopholized state then the oligos should last roughly one year.  They may still work after 1.5 years, but we will not guarantee their functionality. 

The best way to store oligos is in the dry, lyopholized state at -20°C until the first day that you want to use them.  When you want to use the oligos for the first time, it is best to elute them in a pH-controlled buffer and store the aliquotes at -20°C.

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