Storage & Handling

A lyophilised peptide is a stable material right up until it is handled badly. This page covers handling of the laboratory material itself — what to check on arrival, how to store a sealed vial, how to reconstitute one with sterile technique, and how to recognise a vial that should not be used.

On arrival

Vials ship lyophilised and are stable at ambient temperature in transit. A parcel that arrives warm is not a failed shipment; the dried material does not require a cold chain to reach you.

Before anything goes into storage, check each vial:

• The glass is intact, with no cracks or chips and no bent or lifted crimp.
• The stopper is fully seated and shows no puncture mark.
• A dry cake, powder or film is visible inside.
• The label is legible and the lot code on it matches the packing list and the certificate of analysis supplied with the order.

Write the lot code into your records before the vial goes away. It is what ties any later result back to a specific batch and its report.

Storing a sealed vial

• Temperature. Store the sealed vial at −20 °C.
• Light. Keep it away from light. Leave it in its carton, or use another opaque container, rather than leaving vials exposed under bench or freezer lighting.
• Moisture. Lyophilised peptide is hygroscopic — it pulls water out of the air, and residual moisture is the main thing that degrades it in storage. That is what the seal is for. Do not open a vial to inspect it.
• Condensation. Let a vial come to room temperature while still sealed before breaking the seal. Puncturing cold glass draws humid air onto a cold surface and condenses water directly onto the cake.
• Freeze–thaw cycles. Take a vial out of the freezer once, when you are ready to work with it. Repeatedly cycling a sealed vial between temperatures is avoidable damage.

Reconstitution

Reconstitution is dissolving the dried cake back into solution. It is done with bacteriostatic water — sterile water containing a preservative. We sell it as a separate item because a lyophilised vial cannot be reconstituted without a diluent, and it is the one thing first-time buyers forget to order.

Sterile technique

• Work on a clean, uncluttered surface. Wash and dry your hands, and put on clean gloves.
• Wipe the stopper of both the peptide vial and the bacteriostatic water vial with an alcohol swab, and let them air-dry rather than wiping them dry.
• Use a new sterile syringe and needle for each vial. Never re-enter a vial with a needle that has been used for anything else — one re-entry contaminates the whole vial, not just the volume drawn.
• Do not touch the needle, the plunger shaft, or the cleaned surface of a stopper.
• Draw the volume of bacteriostatic water your protocol calls for.

Adding the diluent

• Angle the needle so the stream runs down the inside wall of the vial rather than falling directly onto the cake. A jet fired straight into the material shears it.
• Add the water slowly. Let it reach the cake by running down the glass.
• Swirl the vial gently, or roll it between your palms, until the solution is clear. Never shake it. Agitation shears peptide and whips air into the solution; a vial that has been shaken foams and takes far longer to clear.
• Give it time. Some cakes dissolve in seconds, others need a few minutes of gentle swirling. Warming or vigorous mixing to speed it up is a false economy.
• The result should be clear and free of visible particulate. If it stays cloudy, or particles remain suspended after it has had time to dissolve, do not use it.

After reconstitution

• Keep the reconstituted vial refrigerated at 2–8 °C, protected from light.
• Use it within the period your protocol specifies. A solution is far less stable than the dried cake it came from.
• Do not refreeze a reconstituted vial unless your own protocol validates doing so.
• Label the vial with the lot code and the date it was reconstituted. In a fridge with several vials in it, an unlabelled one is unusable data.
• Keep the reconstituted vial upright and do not transport it loose.

What a compromised vial looks like

Stop and set the vial aside if you see any of the following. None of them can be corrected by handling.

• Cracked or chipped glass, or a crimp that is bent, loose or lifting away from the neck.
• A stopper that is raised, sitting crooked, or already shows a puncture mark.
• No cake at all in a vial that should contain one.
• A cake that has collapsed into a sticky, glassy or oily residue instead of a dry solid — the usual sign that moisture has reached it.
• Brown, yellow or otherwise discoloured material, where the report describes a white to off-white solid.
• Visible moisture, droplets or frost inside a vial that has never been opened.
• A reconstituted solution that stays cloudy, holds particulate, or changes colour on standing.
• A missing, damaged or illegible label, so the lot code cannot be read. Without a lot code the vial cannot be matched to a report, which makes it unusable regardless of its physical condition.

If a vial looks compromised on arrival, photograph it before doing anything else and email info@precisionlabsresearch.ca with the order number and the lot code, within 72 hours of delivery. See Track an Order for what to send.

Disposal

Dispose of glass vials, needles and syringes through your institution’s sharps and laboratory waste procedure, and in line with local regulations. Do not put used vials or needles into general waste.