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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