Independent certificate of analysis on every lotShips from Florida · Same-day dispatch before 2 pm ETTracked shipping on every orderHPLC + MS potency and purity · USP <71> sterilityLaboratory reference materials · Research use onlyVerify any lot against the laboratory’s own recordIndependent certificate of analysis on every lotShips from Florida · Same-day dispatch before 2 pm ETTracked shipping on every orderHPLC + MS potency and purity · USP <71> sterilityLaboratory reference materials · Research use onlyVerify any lot against the laboratory’s own record

Laboratory guide

Reconstituting lyophilized peptides.

A lyophilized vial is a dry cake of peptide and counter-ion. Adding diluent returns it to solution at a concentration you choose. The procedure below keeps the material sterile and the numbers honest. For in-vitro and analytical use only.

Concentration calculator

Pick a vial from the catalog or enter a custom mass, then set the diluent volume and the target amount per draw.

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Units refer to a U-100 insulin syringe (100 units = 1 mL). Figures are arithmetic on the stated net content; the assayed mass on the lot's certificate may differ slightly.

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Bacteriostatic water, 10 mL0.9% benzyl alcohol · multi-draw · $10.00Add to order →

Procedure

Six steps, in order.

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Storage & stability

Cold, dark, and dated.

Peptides degrade through hydrolysis, oxidation and aggregation. Temperature, light and repeated freeze–thaw cycles are the variables you control.

StateTemperatureGuidance
Sealed, lyophilized−20 °CDesiccated, dark. Stable for years; weeks at room temperature in transit is normal.
Reconstituted, bacteriostatic water2–8 °CRefrigerated, protected from light. Use within 28 days of first puncture; label the vial with the date.
Reconstituted, sterile water2–8 °CNo preservative — single-session use only. Aliquot and freeze at −20 °C if it must be kept.
Frozen aliquots−20 °C / −80 °CFreeze once. Thaw once. Every freeze–thaw cycle costs activity; never refreeze a thawed aliquot.

Five avoidable mistakes

Shaking the vial

Shear and foaming denature peptides. Swirl gently or let the cake dissolve on its own.

Jetting diluent onto the powder

Aim the stream at the glass wall so it runs down. A direct jet aerosolizes and clumps the cake.

Opening a cold vial

Condensation forms on a cold cake and adds unmeasured water. Let it reach room temperature first.

Trusting the label mass blindly

The certificate lists the assayed mass. Use it, not the nominal figure, when precision matters.

No date on the vial

Write the reconstitution date and concentration on the label. Memory is not a lab record.

Research use only

This guide describes laboratory handling of reference materials. Nothing here is a dosing recommendation; products are not for administration to humans or animals.