Storing Unreconstituted Peptides

• Freezer (≤ −20 °C): Best for long-term storage.
• Fridge (2–8 °C): Suitable for short- to medium-term storage.
• Room Temperature: Store for short handling periods only. Always refrigerate for long-term storage.

How to Reconstitute Peptides

1. Warm to Room Temperature
   Let both the vial and diluent equilibrate for 15–20 minutes.
2. Clean Closures
   Wipe the rubber stopper with alcohol and let it dry.
3. Measure Diluent
   Add 1–3 mL using sterile lab tools. Adjust based on target concentration. Use the Bluewell calculator for accurate volume planning.
4. Add Diluent Slowly
   Dispense along the side of the vial, not directly onto the powder.
5. Dissolve Gently
   Swirl to dissolve. Avoid shaking. Allow a few minutes to clear.
6. Label and Store
   Record concentration, lot, date, and initials. Refrigerate the reconstituted solution at 2–8 °C. Typical stability ranges from 2 to 8 weeks, depending on peptide and solvent.

Shelf Life Summary

What Not to Do

• Don’t use tap or boiled water.
• Don’t shake vigorously or vortex unnecessarily.
• Don’t re-use needles or measuring devices across different materials.
• Don’t freeze and thaw the same vial repeatedly.
• Don’t over-dilute to weak or unstable concentrations.
• Don’t puncture closures excessively; plan withdrawals carefully.

Full Guide – Detailed Reconstitution Reference

Understanding Reconstitution

Reconstitution transforms lyophilized peptide powder into a solution. Proper technique ensures that peptides maintain integrity and reproducibility in experiments, reducing errors and waste.

Pre-Reconstitution Preparation

Solvent Options

• Bacteriostatic water: Ideal for multi-use vials, as it contains a preservative.
• Sterile water: Best for immediate use; avoid long-term storage.
• Hard-to-dissolve peptides: Some labs pre-wet peptides with a small volume of dilute acetic acid.

Mixing Best Practices

• Avoid vigorous agitation which may denature the peptides.
• Swirl gently to dissolve the peptides and allow time for the solution to clear.
• Label the vial with the concentration, lot number, date, and your initials.

Preventing Contamination

• Work in a clean environment to minimize dust and airborne particles.
• Disinfect closures and let them dry before piercing.
• Use fresh, sterile tools for each access to the vial.
• Minimize punctures into vial closures.

Common Mistakes to Avoid

• Over-diluting to unstable concentrations.
• Using an unsuitable solvent.
• Skipping temperature equilibration.
• Insufficient mixing time.
• Poor aseptic technique when accessing multi-use vials.

Advanced Handling Tips

Compliance and Responsibility

Quick Notes for Successful Reconstitution

• Peptides may dissolve slowly. Swirl and allow 5–10 minutes for dissolution.
• Use a suitable sterile diluent per your organization's SOPs.
• Bluewell calculator helps plan the target concentration and draw volumes for accuracy.
• Remember, reconstituted solutions have a shorter shelf life than dry powder.