Oxytocin

Oxytocin is one of the most historically significant peptides in biochemistry. It was the first peptide hormone to have its structure determined and to be chemically synthesised, work that established the methods underpinning modern peptide synthesis and was recognised with a Nobel Prize in Chemistry in 1955.

Structurally it is a nine-residue peptide with a six-residue ring closed by a disulfide bridge between cysteines at positions one and six, and a three-residue tail. It differs from vasopressin at only two positions — a very small difference for two hormones with distinct physiological roles, and the reason receptor cross-reactivity is a persistent methodological concern in oxytocin research.

The disulfide bridge dominates its handling profile. Reducing conditions break the ring; thiol exchange can scramble it. Either outcome produces a molecule that may still look approximately correct by mass but has lost the conformation that defines it.

The oxytocin literature is unusually broad. Classical work covers uterine and mammary physiology, where its role is well established and where the licensed medicine is used. A large modern literature examines oxytocin receptor signalling in the central nervous system, including social behaviour and affiliation research in animal models and in human studies of varying quality.

Anyone reviewing the behavioural literature should do so critically. Reproducibility problems in this area are widely acknowledged, particularly around intranasal administration studies, and effect sizes have often shrunk under replication. VaultLabs takes no position on those debates and makes no claims about behavioural effects.

For reference-material purposes, the most common laboratory applications are receptor-binding and signalling assays, analytical method development, and use as a synthesis or stability reference given the compound's well-characterised chemistry.

Release is by reversed-phase HPLC against a stated purity specification with a lot-linked certificate. For a disulfide-bridged peptide the related substances of interest are the reduced linear form and disulfide-scrambled species, both of which are worth resolving explicitly rather than reporting only a main-peak percentage.

Avoid reducing agents and thiol-containing buffer components unless the protocol specifically calls for them. Store sealed lyophilised vials at 2–8 °C protected from light and moisture, equilibrate before opening, and keep the material away from conditions that promote disulfide exchange.

After reconstitution, prepare working solutions close to the point of use and log diluent, date and thaw cycles. Aqueous oxytocin solutions have a limited practical lifetime, and the certified purity does not extend to a stored preparation.

Oxytocin is a licensed medicine in obstetric practice in the UAE and internationally. VaultLabs research material is not that product: it is not manufactured, released or supplied as a pharmaceutical, and it is not for human or veterinary use. The existence of a licensed medicine with the same active name does not permit clinical use of research material.

The catalog presentation is a 10 mg lyophilised vial with lot-linked certificate retrieval, held under controlled cold storage before dispatch.

Oxytocin receptor binding

Social behavior models (preclinical)

Uterine tissue assays (in vitro)

Neuroendocrine signaling panels

2–8 °C (lyophilized, sealed)

2–8 °C standard peptide storage for lyophilized research material.

Relatively stable lyophilized; aqueous solutions require refrigeration and documented hold times.