Peptides can be built two ways: in solution (liquid-phase) or anchored to a bead (solid-phase). Today, solid-phase synthesis dominates. Here’s how the two approaches compare.
- Liquid-phase (LPPS): the classic approach, done in solution.
- Solid-phase (SPPS): the chain is built on a solid resin bead.
- Today: SPPS is the standard for most research peptides.
The two approaches
In liquid-phase synthesis, each step happens in solution and products are purified between steps — precise but slow. In solid-phase synthesis, the growing chain stays attached to a resin bead, so excess reagents are simply washed away between steps. That efficiency is why SPPS took over.
| Liquid-phase | Solid-phase | |
|---|---|---|
| Where it happens | In solution | On a resin bead |
| Between steps | Purify each time | Wash away excess |
| Best for | Some short peptides, scale | Most research peptides |
Why it matters
Either way, the finished peptide is purified and tested before use. To see the full solid-phase workflow, read how peptides are made, then how quality is verified with HPLC.
Research use only. For educational purposes. Compounds referenced are sold strictly for in vitro laboratory research by qualified professionals.
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