Acid-Labile
Acid-Labile — A chemical bond or protecting group that is cleaved under acidic conditions, relevant to Boc-based peptide synthesis strategies.
What Does Acid-Labile Mean?
Acid-labile describes a chemical bond or protecting group that is cleaved under acidic conditions. In Fmoc SPPS, all side-chain protecting groups (tBu, Trt, Pbf, Boc) are acid-labile, removed by 95% TFA during final cleavage. This orthogonality (base-labile Fmoc + acid-labile side chains) is the foundation of modern peptide synthesis strategy.
Acid-Labile Elements
- tBu (tert-butyl): Protects Ser, Thr, Tyr, Glu, Asp. Removed by TFA
- Trt (trityl): Protects Cys, His, Asn, Gln. Removed by 1-5% TFA
- Pbf: Protects Arg. Requires concentrated TFA and extended cleavage time
- Acid-labile resins: Wang, 2-chlorotrityl. Cleaved by TFA to release peptide with free C-terminus
Frequently Asked Questions
What is Acid-Labile?
A chemical bond or protecting group that is cleaved under acidic conditions, relevant to Boc-based peptide synthesis strategies.
Why is Acid-Labile important in peptide research?
Acid-Labile is a fundamental concept in chemistry as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.