Fmoc-β-Ala-Ile-OH Impurities Standards For Peptide Building Blocks

• Used as a dipeptide building block in peptide synthesis
• Fully compatible with the Fmoc strategy
• The β-alanine unit:
  • Introduces flexibility
  • Reduces steric hindrance
• The isoleucine residue (Ile):
  • Is bulky and hydrophobic
  • Can make coupling more challenging → this dipeptide helps improve efficiency

• β-Ala acts as a flexible spacer
• Ile provides strong hydrophobic interaction

Used for:

• Enhancing binding affinity (especially hydrophobic pockets)
• Modulating peptide conformation
• Improving metabolic stability

• Acts as a flexible yet hydrophobic linker
• Common in:
  • Peptide conjugates
  • Drug delivery systems
  • Modified therapeutic peptides

Compared to Glycine-based linkers, it is:

• Longer (β-Ala)
• More hydrophobic (Ile)

• β-Ala disrupts regular secondary structures
• Ile tends to promote hydrophobic packing

Applications:

• Fine-tuning peptide folding
• Designing protease-resistant sequences