TSMS-PC-011
Solid-Phase Peptide Synthesis (SPPS) Study Guide
School of Peptide Chemistry · Peptide Synthesis and Manufacturing Foundations · Intermediate–Advanced
Open full lessonLearning objectives
- Explain the basic logic of solid-phase peptide synthesis.
- Describe the role of the resin and linker.
- Outline a typical deprotection–coupling cycle.
- Identify common sources of deletion sequences and incomplete synthesis.
- Explain why washing, process control, and sequence-specific optimization matter.
Executive summary
Solid-phase peptide synthesis, commonly abbreviated SPPS, is a stepwise method in which a growing peptide chain remains attached to an insoluble support while amino-acid residues are added sequentially.
The central advantage is operational control. Excess reagents can be used to drive reactions toward completion, then removed by filtration and washing while the peptide remains bound to the resin.
A typical cycle consists of:
1. temporary protecting-group removal,
2. washing,
3. amino-acid activation and coupling,
4. washing,
5. optional completion testing or capping.
The cycle is repeated until the full sequence has been assembled. The peptide is then cleaved from the support and globally deprotected.
SPPS is powerful, but each incomplete step creates the possibility of sequence-related impurities that accumulate as chain length increases.
The central advantage is operational control. Excess reagents can be used to drive reactions toward completion, then removed by filtration and washing while the peptide remains bound to the resin.
A typical cycle consists of:
1. temporary protecting-group removal,
2. washing,
3. amino-acid activation and coupling,
4. washing,
5. optional completion testing or capping.
The cycle is repeated until the full sequence has been assembled. The peptide is then cleaved from the support and globally deprotected.
SPPS is powerful, but each incomplete step creates the possibility of sequence-related impurities that accumulate as chain length increases.
Key takeaways
- SPPS builds peptides stepwise on an insoluble support.
- Most cycles alternate temporary deprotection and coupling.
- Washing is central to process control.
- Incomplete coupling creates deletion impurities.
- Resin loading and swelling influence synthesis efficiency.
- Automation improves execution but does not eliminate sequence-specific chemistry.
Self-review questions
- Why is synthesis commonly performed from C-to-N?
- What is the role of the resin?
- How does an incomplete coupling create a deletion sequence?
- Why might lower resin loading help a difficult sequence?
- What does capping accomplish?
Use the full lesson to verify your answers.