Oxytocin liquid spray

What is it for?

Oxytocin, the nine-residue cyclic neuropeptide, in solution at 1.0 mg/mL — 10 mg across a 10 mL atomiser, a nominal 100 micrograms per actuation. The disulphide bridge that closes the ring is the part that matters for handling: keep it cold and dark, because that bond is what a warm, lit shelf degrades first. Refrigerate and protect from light.

Which guides use it?

• Concentration and syringe-unit table
• Bacteriostatic water and benzyl alcohol in cell work
• Storage guide

Related reading

• The disulphide bridge in oxytocin, and why it dictates storageOne sulphur-sulphur bond closes the ring that makes oxytocin what it is. It is also the least stable thing in the molecule, and the reason the storage instruction reads the way it does.
• Cyclic peptides versus linear peptidesClosing a peptide into a ring removes the termini that enzymes attack and fixes a shape that would otherwise flicker between conformations. It also introduces a failure mode a linear chain cannot have.
• What a blend certificate shows, and what it leaves outA single purity figure across two compounds conflates two questions and answers neither. What a multi-component certificate has to report, and the one number people forget to check.
• Designing a concentration-response experiment with research peptidesA concentration-response curve is only as good as the stock it came from. This post covers choosing a concentration range, why serial dilution propagates a single error through every point, what controls the peptide itself demands, and what to record.