What Are Peptides?

Peptides are short chains of amino acids linked by peptide bonds. They sit between individual amino acids and full-length proteins in size, typically ranging from two to roughly fifty residues.

In a laboratory context, peptides are characterized by properties such as:

• Amino acid sequence
• Molecular weight
• Net charge and isoelectric point
• Solubility profile
• Purity by HPLC
• Identity by mass spectrometry

Most research peptides are produced by solid-phase peptide synthesis (SPPS), where the chain is assembled one residue at a time on a solid resin support, then cleaved and purified.

Purification is commonly performed by reversed-phase HPLC, and the finished material is lyophilized (freeze-dried) into a stable powder for laboratory storage and shipping.

Every batch should be accompanied by analytical documentation. A typical Certificate of Analysis (COA) reports:

• Batch or lot number tied to the specific production run
• Purity percentage determined by HPLC, with the chromatogram
• Identity confirmation by mass spectrometry
• Appearance and physical form of the lyophilized material
• Date of analysis and the testing laboratory

General laboratory practice for lyophilized peptide reference material includes storing vials sealed and protected from light, moisture, and repeated temperature cycling.

Materials should be handled only by trained personnel using appropriate personal protective equipment, in accordance with your institution's standard operating procedures and safety policies.

Reproducible laboratory work depends on knowing exactly what is in the vial. Batch-specific analytical data lets a researcher verify identity and purity before any experimental work begins.

Atlas US Labs supplies research materials with third-party analytical documentation so that identity and purity can be independently reviewed.

The research materials offered by Atlas US Labs are not approved by the U.S. Food and Drug Administration for human or veterinary use, and are not drugs, dietary supplements, cosmetics, or medical devices.

Nothing on this site describes methods of administration, dosing, or use in humans or animals, and nothing here should be interpreted as medical advice. Purchasers are responsible for compliance with all applicable federal, state, and local laws.