Liquid-Phase Peptide Synthesis
A peptide manufacturing method where synthesis occurs in solution rather than on a solid support. Liquid-phase synthesis can be more efficient for large-scale production of shorter peptides and allows easier scale-up than SPPS for certain sequences, but requires more purification steps.
Technical Context
In liquid-phase (solution-phase) synthesis, coupling and deprotection reactions occur in solution rather than on a solid support. Advantages: easier scale-up (no resin loading limitations), intermediate purification at each step is possible (allowing correction of errors), and no resin cleavage step needed. Disadvantages: requires purification after each step (time-consuming), excess reagent removal is more complex, and the approach is less amenable to automation. Solution-phase synthesis is used commercially for: very short peptides (2-5 amino acids) where SPPS overhead is unnecessary, large-scale production where resin costs become prohibitive, and convergent synthesis strategies where pre-formed peptide fragments are coupled in solution. Hybrid approaches combine SPPS for fragment preparation with solution-phase fragment condensation for assembling larger peptides.