N末端的生物素标记

N末端的生物素标记

  • Wash 0.1 mmol resin with DMF.

  • Dissolve 0.244 g (+)-biotin (1 mmol, MW 244.3) in 5 mL DMF-DMSO (1:1) solution. A little warming is necessary.

  • Add 2.1 mL 0.45 M HBTU/HOBt solution and 0.3 mL DIEA to the solution prepared in step 2.

  • Add the activated biotin solution to the resin and let stir overnight.

  • Check resin to make sure coupling is complete as evidenced by negative ninhydrin test (colorless).

  • Wash resin with DMF-DMSO (1:1) (2x) to remove excess (+)-biotin.

  • Wash resin with DMF (2x) and DCM (2x).

  • Let the resin dry before proceeding to cleavage.


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