Molecular Weight
Molecular weight (MW) is the sum of the atomic masses of all atoms in a molecule, expressed in Daltons (Da) or atomic mass units (amu). It is a fundamental identifying property of every peptide.
Examples from the Healthy Aminos catalog: KPV has a MW of 342.43 Da (3 amino acids), BPC-157 is 1419.53 Da (15 amino acids), TB-500 is approximately 4921 Da (43 amino acids), and tesamorelin is 5135.9 Da (44 amino acids).
Mass spectrometry confirms peptide identity by measuring molecular weight to within ±1 Da. The observed mass-to-charge ratio (m/z) on a mass spectrum should match the calculated theoretical MW. This provides orthogonal identity verification beyond HPLC retention time.
Molecular weight also influences pharmacokinetic properties in research models — larger peptides generally have different distribution and clearance profiles than smaller ones.
All Healthy Aminos products are for research use only.
Related Products
Related Terms
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.
Amino Acid Sequence
The linear order of amino acid residues in a peptide or protein chain, written from N-terminus to C-terminus, which determines the molecule's identity and properties.
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.
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.