Research Library
Neutral reference material on how peptides are made, how they are analysed, and what published research says about individual compounds. No dosing guidance, no administration instructions.
Peptide Fundamentals
How synthetic peptides are produced, characterised, documented and stored.
What Are Peptides?
Peptides are short chains of amino acids linked by peptide bonds, typically fewer than about fifty residues. In research settings they are usually produced synthetically, characterised by analytical methods such as HPLC and mass spectrometry, and supplied as lyophilized reference material for in-vitro laboratory work.
How Synthetic Peptides Are Manufactured
Synthetic peptides are most commonly manufactured by solid-phase peptide synthesis. Protected amino acids are coupled sequentially onto a resin, the finished chain is cleaved and deprotected, and the crude material is purified by preparative reversed-phase chromatography before lyophilization and analytical release testing.
How Peptide Purity Is Measured
Peptide purity is normally measured by reversed-phase HPLC with UV detection. The area of the target peak is expressed as a percentage of the total detected peak area. The figure is a relative chromatographic measure of peptide-related species and does not describe total vial contents, sterility or identity.
HPLC vs LC-MS
HPLC separates the components of a sample and quantifies their relative abundance, producing a purity figure. LC-MS couples that separation to a mass detector, so each separated component can also be identified by mass. In short: HPLC answers how much of the detected material is the main peak; LC-MS helps answer what that peak is.
Understanding Peptide COAs
A certificate of analysis (COA) is a document issued by a testing laboratory recording what was tested, how it was tested, and what results were obtained for a specific batch. A useful COA identifies the sample and batch, names the laboratory, states the analytical methods, gives the date, and reports results against defined parameters.
What Is Peptide Lyophilization?
Lyophilization, or freeze-drying, removes water from a frozen peptide solution by sublimation under vacuum. The resulting dry cake or powder is more chemically and physically stable during storage and transport than a peptide in solution, and is reconstituted with an appropriate solvent before laboratory use.
Understanding Peptide Counterions
Synthetic peptides containing basic residues are usually isolated as salts. The associated counterion — commonly trifluoroacetate or acetate — contributes to the total mass of the material. This is why the net peptide content of a vial can be lower than its gross weight, and why counterion analysis is sometimes reported.
What Is TFA in Peptide Manufacturing?
Trifluoroacetic acid (TFA) is widely used during peptide cleavage and reversed-phase purification. Residual TFA can remain associated with the finished peptide as a counterion. Residual TFA analysis quantifies how much remains, and is an entirely separate measurement from peptide purity.
What Is Endotoxin Testing?
Bacterial endotoxin testing measures lipopolysaccharide derived from the outer membrane of Gram-negative bacteria. It is typically performed using LAL or recombinant Factor C methods and reported in endotoxin units (EU) per milligram or per vial. Endotoxin content is independent of chemical purity.
Sterility vs Purity
Purity and sterility answer different questions. Purity is a chemical measurement describing the proportion of detected material that corresponds to the target compound. Sterility is a microbiological determination of whether viable organisms are present. A high purity result does not establish sterility, and vice versa.
How Peptides Should Be Stored in Research Laboratories
Lyophilized research peptides are generally stored frozen, commonly at -20 °C, protected from light and moisture. After reconstitution, solutions are typically refrigerated and used within the period supported by supplier documentation. Repeated freeze-thaw cycles and prolonged room-temperature storage should be avoided.
Compound Reference Pages
Molecular information, investigated mechanisms and regulatory status for individual compounds.
What Is BPC-157?
BPC-157 is a synthetic pentadecapeptide with the sequence GEPPPGKPADDAGLV, derived from a partial sequence of a protein found in gastric juice. It has been studied in preclinical animal and cell-model research. It is not an approved medicine in Canada or the United States and is supplied only as a research reference material.
What Is TB-500 / Thymosin Beta-4?
Thymosin beta-4 is a naturally occurring 43-amino-acid actin-binding peptide. TB-500 is the name commonly used in the research-material market for a synthetic peptide related to thymosin beta-4. Published work is preclinical, and the material is supplied for laboratory research only.
What Is CJC-1295?
CJC-1295 is a synthetic analogue of growth hormone-releasing hormone based on the GRF (1-29) fragment, modified to improve stability. The version supplied without a drug affinity complex is often referred to as modified GRF (1-29). It is a research reference material, not an approved medicine.
What Is Ipamorelin?
Ipamorelin is a synthetic pentapeptide studied as a selective ligand at the growth hormone secretagogue receptor. Its research designation is NNC 26-0161. It is supplied as a laboratory reference material and is not an approved medicine.
What Is Retatrutide?
Retatrutide (research designation LY3437943) is a synthetic peptide described in peer-reviewed literature as an agonist at the GIP, GLP-1 and glucagon receptors. It is an investigational compound studied under regulated clinical trial conditions and is supplied here only as a laboratory reference material.
What Is Tesamorelin?
Tesamorelin is a stabilised synthetic analogue of human growth hormone-releasing hormone (GHRH 1-44), also known by the research designation TH9507. It appears in published endocrine research literature and is supplied here strictly as an analytical reference material.
What Is MOTS-c?
MOTS-c is a 16-amino-acid mitochondrial-derived peptide encoded within the mitochondrial 12S rRNA region, with the sequence MRWQEMGYIFYPRKLR. It has been studied in preclinical metabolic signalling research and is supplied as a laboratory reference material.
What Is KPV?
KPV is the tripeptide Lys-Pro-Val, corresponding to the C-terminal fragment of alpha-melanocyte-stimulating hormone. It has been examined in in-vitro research on inflammatory signalling pathways and is supplied as a laboratory reference material.