Plain-English definitions of the terms used across the TAD catalogue and knowledge hub, for research context.

Peptide

A short chain of amino acids joined by peptide bonds — smaller than a protein.

Amino acid

The individual building block of peptides and proteins.

Sequence

The specific order of amino acids that defines a given peptide.

Lyophilisation (freeze-drying)

Removal of water under vacuum to leave a stable dry powder that stores well.

Reconstitution

Dissolving a lyophilised peptide in a diluent to form a solution for research use.

Bacteriostatic water

Sterile water containing 0.9% benzyl alcohol, which inhibits bacterial growth, commonly used as a reconstitution diluent.

Aliquot

A measured sub-portion divided off from a larger solution so the remainder is left undisturbed.

HPLC (high-performance liquid chromatography)

An analytical technique that separates a sample to measure its purity.

Mass spectrometry (MS)

A technique that measures molecular weight to confirm a compound’s identity.

Certificate of analysis (COA)

A document reporting a batch’s identity and measured purity.

Lot / batch

A single production run, tracked by a unique number for traceability.

Purity

The proportion of a sample that is the intended peptide; TAD’s release standard is ≥99% by HPLC.

Molecular weight

The mass of a molecule, usually expressed in daltons (Da).

Secretagogue

A substance studied for its capacity to promote the secretion of another substance.

GHRH analogue

A synthetic molecule whose structure resembles growth-hormone-releasing hormone.

Chelation

The binding of a metal ion within a molecule — for example, copper held within GHK-Cu.

Half-life

The time taken for a quantity to fall to half its value; a common pharmacokinetic descriptor in research.