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== Peptide synthesis usually consists of the following cycles == 1. Deprotection: Fmoc-protected columns and monomers must use an alkaline solvent (piperidine) to remove the amino protective group.

2. Activation and cross-linking: The carboxyl group of the next amino acid is activated by an activator. The activated monomer reacts with the free amino group to form a peptide bond. In this step, a large amount of super-concentration reagents are used to drive the reaction to completion. Circulation: The two-step reaction repeatedly circulates until the synthesis is completed.

3. Elution and deprotection: The peptide is eluted from the column, and its protecting group is eluted and deprotected by a deprotection agent (TFA).