Peptide
A chain of amino-acid residues connected by peptide bonds. Peptides are identified by their sequence, molecular weight and chemical context.
Read related articlePeptide terminology
Peptide Glossary
Short definitions for research peptide, analytical, storage and quality terms used across the blog.
Research-use only: glossary entries describe laboratory materials and research terminology, not human or veterinary administration.
Amino acid
A molecular building block with an amino group, a carboxyl group and a side chain that gives it distinct chemical behavior.
Read related articleSequence
The ordered list of amino-acid residues in a peptide. Sequence order affects charge, structure, solubility and analytical identity.
Molecular weight
The calculated mass of a molecule based on its atoms, sequence and modifications. Mass spectrometry can support identity by comparing observed mass signals with expected values.
Purity
A measure of how much detected material corresponds to the target compound under a defined analytical method. Purity is not the same as identity or sterility.
Read related articleHPLC
High-performance liquid chromatography. A separation method commonly used to estimate peptide purity by comparing chromatographic peak areas.
Read related articleMass spectrometry
An analytical method that measures mass-to-charge signals. For peptides, it is commonly used to support molecular identity.
Read related articleCOA
Certificate of analysis. A batch-level document that reports selected analytical information such as identity checks, purity results and method context.
Read related articleLyophilization
Freeze-drying. Water is removed from frozen material under reduced pressure, leaving a dry cake, powder, film or residue.
Read related articleSolubility
How a material behaves in a defined solvent system under defined conditions. For peptides, solubility depends on sequence, charge, pH, hydrophobicity and modifications.
Read related articleReconstitution
The laboratory term for returning a dry material into a liquid state under a defined protocol. In this shop context, it is not human-use instruction.
Read related articleBAC Water
Bacteriostatic water. An aqueous support material that commonly contains benzyl alcohol; it is not a peptide sequence.
Read related articleSterility
A separate quality question concerning viable microorganisms. HPLC purity alone does not prove sterility.
Read related articleEndotoxin
A pyrogenic component associated with certain bacteria. Endotoxin status is separate from chromatographic purity and identity confirmation.
Stability
The tendency of a material to maintain its chemical and physical properties under defined storage and handling conditions.
Read related articleDegradation
Chemical or physical change over time, such as hydrolysis, oxidation, deamidation or aggregation.
Read related articleOxidation
A chemical change involving oxygen or electron transfer. Residues such as methionine, cysteine and tryptophan are commonly discussed in oxidation contexts.
Hydrolysis
A water-associated cleavage process that can affect susceptible chemical bonds under certain conditions.
Read related articleAggregation
Physical association of peptide molecules with each other. Aggregation can be influenced by concentration, hydrophobic regions, pH, salts, surfaces and time.
Cold chain
A temperature-control strategy for storage or transport. Cold-chain language describes environmental handling, not clinical suitability.
Read related articleResearch use only
A product-status statement meaning the material is supplied for laboratory research and is not intended for human or veterinary administration.
Read related articleVial
A small container used for laboratory materials. For peptides, vial labeling and seal condition are part of material traceability.
Read related articleSeptum
The stopper component of a vial closure. Its condition is part of container integrity, not a substitute for analytical testing.
Batch number
A traceability identifier connecting a material to a production or testing lot and any associated documentation.
Read related articleModified peptide
A peptide with chemical changes beyond the simple residue chain, such as terminal modification, cyclization, metal complexation or other structural changes.
GHRH
Growth-hormone-releasing hormone. In peptide research, GHRH language is used around receptor-family context and endocrine-signaling models.
Read related articleGHRH receptor
A receptor associated with growth-hormone-releasing hormone signaling. Mentions of this receptor describe research context, not human-use instruction.
Read related articleACTH fragment
A shorter sequence derived from adrenocorticotropic hormone context. ACTH-fragment analog language is used for compounds such as Semax.
Read related articleTuftsin
A short peptide sequence discussed in immune-signaling literature. Selank is commonly described as a synthetic tuftsin-related analog.
Read related articleTetrapeptide
A peptide with four amino-acid residues. Epithalon or AEDG is commonly discussed as a tetrapeptide.
Read related articleHeptapeptide
A peptide with seven amino-acid residues. Semax and Selank are commonly discussed in heptapeptide contexts.
Read related articleReceptor analog
A compound designed or discussed in relation to a receptor pathway. The term describes research context and does not establish product-use suitability.
Preclinical model
A non-consumer research model, such as cell-based, animal or laboratory systems used before or outside clinical-use conclusions.
Read related articleFinished pharmaceutical product
A regulated product supplied under a specific authorization, manufacturing, labeling and intended-use framework. It is separate from a research-use material.
Read related articleCopper peptide
A broad term for a peptide associated with copper. GHK-Cu is a specific copper complex of the GHK tripeptide.
Read related article