Prostamax: Handling, Storage, and Reconstitution Guide

Prostamax arrives as a solid, white, freeze-dried powder in a sealed glass vial. It is supplied as a 20 mg vial at a stated purity of at least 99 percent. The KEDP tetrapeptide is small, highly polar, and easy to dissolve. So most handling failures come from moisture, freeze-thaw damage, and poor records, not from hard chemistry. Everything below is lab procedure for a research material and carries no human or veterinary meaning.

What are the basics of Prostamax handling and storage?

Prostamax handling and storage begins with the dry state. Store the sealed, freeze-dried vial at or below 25 degrees Celsius. Keep it away from heat, light, and moisture.

For anything beyond short-term bench storage, keep the material freeze-dried. Move it to a fridge or freezer. Cold slows the water-driven and oxygen-driven breakdown that harms short peptides over a long study. A vial left at room temperature on an open bench is the most common avoidable loss.

Treat the vial as a research chemical throughout. Only trained staff should handle it. Use standard PPE: a lab coat, gloves, and eye protection. Add whatever engineering controls lab policy requires for powders.

Weighing a fine freeze-dried cake puts particles in the air. So use a balance enclosure or containment hood if the cake is split dry. This is not needed if the whole cake is reconstituted at once.

How should the vial be received and inspected?

On receipt, confirm that the seal and crimp are intact. Check that the lot number on the label matches the lot on the certificate of analysis. Record three things:

• The arrival date.
• The condition of any cold packs.
• The storage location the vial goes into.

These three details let a lab later work out whether a suspect result reflects biology or a temperature problem in transit.

Inspect the cake itself. A normal cake is a dry white solid, or a light film stuck to the vial base. Watch for signs of moisture getting in: color change, a collapsed or oily-looking cake, or visible droplets inside the vial. If any appear, set the material aside. Do not use it in a quantitative test.

Always let a cold vial reach room temperature before breaking the seal. Opening a cold vial pulls humid air onto the cold cake and wets it at once.

How is Prostamax reconstituted for in vitro work?

For in vitro work, bacteriostatic water is the usual solvent for research peptide stocks. Add the solvent slowly down the inner wall of the vial, not straight onto the cake. Then swirl gently, or roll the vial between the fingers, until the solid clears.

Do not vortex or shake hard. The shear force and the foam that forms are what damage peptides. A tetrapeptide this soluble does not need that kind of mixing.

Strength follows from the molecular weight of about 487.51 g/mol and the formula C20H33N5O9. Reconstituting the full 20 mg vial in 2 mL gives a 10 mg/mL stock. That is close to 20.5 mM. Report stocks in molar terms, not just mass terms. This lets another lab repeat an exposure exactly.

Match the working strength to the assay in the lab protocol, not to a fixed recipe. Cross-check it against the model systems in the Prostamax research applications.

One solvent caveat is worth planning for. Bacteriostatic water contains benzyl alcohol as a preservative. At the dilutions some assays need, it can harm sensitive cell cultures. Where that is a concern, sterile water or an assay-suitable buffer is the better solvent.

In either case, the vehicle control arm must contain the same solvent at the same final strength. Otherwise the solvent may quietly cause the effect.

How should Prostamax be aliquoted to manage freeze-thaw?

Split reconstituted stock into single-use portions, called aliquots, right away, before anything is frozen. Repeated freeze-thaw cycles are the largest source of run-to-run variation in peptide work. A single-use aliquot removes the urge to thaw a master tube five times.

For dilute stocks, low-binding polypropylene tubes beat glass. Short peptides stick to container surfaces in measurable amounts at low strength.

• Size each aliquot to one test, with a small margin, so nothing thawed is refrozen.
• Label with compound name, lot number, strength in both mg/mL and molar terms, solvent, and date.
• Store aliquots frozen, at minus 20 degrees Celsius for near-term use and colder for longer holds.
• Thaw on ice, not at room temperature, and mix by gentle inversion before use.
• Log the freezer, shelf, and box position, so the cold chain can be traced during review.

If an aliquot must be reused, note how many thaw cycles it has seen next to the data it produced. That single column in a lab notebook explains a surprising number of odd gaps between repeats.

How stable is freeze-dried Prostamax, and why does the cold chain matter?

Freeze-dried peptide is far more stable than peptide in solution. That is the practical case for reconstituting only what a test needs and leaving the rest of the vial dry.

Kept sealed, dry, cold, and dark, the freeze-dried solid holds up well across a long study. In solution, expect a much shorter usable life. Plan the study calendar around that, not around convenience.

The same cold chain logic applies across the whole tetrapeptide class. Groups running several bioregulators can keep methods uniform by following the Testagen handling guide, the Pancragen handling guide, and the Vesugen handling guide. Uniform handling across arms is what makes a comparison panel readable.

How are lots tracked and the certificate of analysis checked?

No CAS number is established for KEDP. So identity does not rest on a registry lookup. It rests on the sequence Lys-Glu-Asp-Pro, the formula, the observed mass, and the test certificate.

Each batch ships with a third-party-verified certificate of analysis. It reports:

• Purity, by HPLC or reverse-phase chromatography.
• Identity, confirmed by mass spectrometry.
• The lot number, test date, and methods used.

Read it, do not just file it.

Record the lot number in the test record next to every result from that vial. When a study spans several lots, treat lot as a variable in the analysis. Sample certificates can be requested before purchase from the Prostamax product page. Their identity data also anchor any mechanism claim of the kind described in the Prostamax mechanism of action.

Common research questions about Prostamax handling

What solvent is used to reconstitute Prostamax for laboratory work?

Bacteriostatic water is the usual choice for research peptide stocks. Sterile water or an assay-suitable buffer is better where the benzyl alcohol preservative would disturb a sensitive culture. Whichever is used, the vehicle control must match it exactly.

How should reconstituted Prostamax be stored?

Store it as single-use frozen aliquots in low-binding tubes. Thaw them on ice and do not refreeze them. Freeze-dried material is the stable form. So reconstitute only what the test needs, and keep the rest sealed, dry, and cold.

What should be checked on the certificate of analysis?

Check that the lot number matches the vial label. Then confirm that purity, the mass spectrometry identity result, the test date, and the methods are all present. They should also fit the sequence and formula.

For research use only. Prostamax is an investigational research peptide supplied for laboratory use and is not approved for human or veterinary use. All guidance above describes laboratory procedure only.