Amino Acid Sequence
The amino acid sequence — also called the primary structure — defines the exact order of amino acid residues in a peptide chain, conventionally written from the N-terminus (free amino group) to the C-terminus (free carboxyl group). This sequence is the fundamental determinant of a peptide's molecular identity.
For example, BPC-157 has the sequence Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val (15 residues), while KPV is simply Lys-Pro-Val (3 residues). Even a single amino acid substitution can produce a completely different compound with distinct properties.
Sequence verification is a critical quality control step in peptide manufacturing. Mass spectrometry confirms the molecular weight matches the expected sequence, while amino acid analysis can verify the composition ratios. Errors in solid-phase peptide synthesis — such as deletion sequences (missing residues) or truncated fragments — produce impurities detectable by HPLC.
All Healthy Aminos products are for research use only.
Related Terms
Amino Acid
Organic molecules containing both an amino group (-NH2) and a carboxyl group (-COOH) that serve as the building blocks of peptides and proteins.
Peptide Bond
A covalent chemical bond formed between the carboxyl group of one amino acid and the amino group of another through a condensation reaction, linking amino acids into chains.
Molecular Weight
The sum of atomic weights of all atoms in a molecule, expressed in Daltons (Da). Used to identify peptides via mass spectrometry.
Mass Spectrometry
An analytical technique that measures molecular weight by ionizing molecules and separating them by mass-to-charge ratio, used to confirm peptide identity.
Research Use Only
FOR RESEARCH USE ONLY. Products sold by Healthy Aminos are intended strictly for in-vitro research and laboratory use. Not for human or animal consumption. Not FDA approved. By purchasing from Healthy Aminos, the buyer acknowledges that these products are not intended to diagnose, treat, cure, or prevent any disease. All products are sold as reference standards and research chemicals only.