Ovagen

What Ovagen is, structurally

Ovagen is a tripeptide with a free N-terminal amine and a free C-terminal acid.

No molecular formula is recorded, so the reasoning here starts from the sequence and the molecular weight rather than a formula. Those two suffice: three residues at 375.38 g/mol account for the molecule completely. A consistent formula is given in the flags rather than the data block, being derived rather than supplied.

Charge is strongly negative: two acidic side chains and the C-terminus against a single N-terminal amine, with no basic residue anywhere.

The C-terminal leucine is the only non-polar feature. Its isobutyl side chain is a substantial fraction of a three-residue peptide, giving an otherwise hydrophilic molecule a modest hydrophobic surface, which matters more for chromatography than solubility. It remains freely water soluble, though no quantitative figure is quoted here.

Two positions carry chemistry worth naming: the N-terminal glutamate, whose side chain can close onto its own alpha-amine, and the aspartate, followed by a residue whose backbone nitrogen bears a hydrogen. Both are covered under storage.

There is no cysteine, no methionine and no aromatic residue.

Reconstitution and handling

Sterile water is the default solvent, and with no metal centre present PBS or an appropriate assay buffer are equally suitable. Add diluent down the vial wall, swirl gently, and let it stand until clear. Vortexing only introduces foaming.

Prepare near neutral and use solutions promptly. Both of this compound's degradation routes proceed in water and both are accelerated by conditions away from neutral, so the same handling addresses each.

Adsorption onto plasticware is worth allowing for at low concentration, with low-protein-binding tubes reducing measured loss. The leucine gives this peptide slightly more affinity for polypropylene than a wholly acidic tripeptide would have.

This is laboratory preparation chemistry, not dosing, administration, or protocol guidance of any kind.

Storage and stability

Store the lyophilized powder at -20 degrees C, sealed, desiccated and protected from light, and let a cold vial warm before opening. Reconstituted, hold at 2 to 8 degrees C, or aliquot and freeze rather than thawing repeatedly.

Two routes are open, at opposite ends of a three-residue molecule.

The N-terminal glutamate can cyclise to pyroglutamate, its side chain closing onto its own alpha-amino group and releasing water, so the product is eighteen units lighter and has lost its free amine. Warmth accelerates it. The route is specific to glutamate or glutamine in the first position.

The aspartate can rearrange to isoaspartate. The following residue's backbone nitrogen attacks its side chain, closing a succinimide that reopens as either isomer, leaving the mass unchanged. Here that residue is leucine, whose nitrogen carries a hydrogen, so the route is genuinely available. It is not available to every aspartate: one followed by proline, or sitting at a C-terminus, cannot do this at all.

Neither route involves oxidation. With no cysteine, methionine or tryptophan, air exposure is not a concern, and cold, dry, near-neutral storage addresses both of the routes that are open.

How Ovagen is tested

Reversed-phase HPLC establishes chromatographic purity as area percent. With no aromatic residue there is no absorbance at 280 nm, so detection sits near 214 nm.

The leucine improves retention appreciably relative to a wholly acidic tripeptide, giving a C18 phase something to hold, so it elutes as a defined peak rather than near the void volume. That makes separation from close impurities more straightforward than for several compounds in this family.

Area percent is a chromatographic measure rather than peptide content by weight. On a 375 g/mol peptide the counter-ion is a proportionally large share of the vial contents.

Mass spectrometry confirms identity, and the two degradation routes behave very differently under it. Pyroglutamate formation is a clean loss of eighteen, giving a species at 357.36 that is readily visible. The isoaspartate rearrangement changes nothing about the mass at all, so it is invisible by mass and only chromatography will show it. A method relying on mass alone would detect one of the two liabilities and miss the other entirely.

Handling FAQ

Why does this page derive a formula rather than state one? Because none is recorded for the product. The sequence and molecular weight together determine the composition, and a formula consistent with both is set out in the flags. Stating it in the data block would present a derived value as a supplied specification, which it is not.

Are both degradation routes detectable by mass spectrometry? No, only one. Pyroglutamate formation removes water and shows as a species eighteen units lighter. The isoaspartate rearrangement leaves the mass identical, so it requires chromatographic separation to see.

Full specifications for Ovagen.