Mixing Peptide Vials: A Comprehensive Guide

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See mixing ratio below page

Peptides are increasingly gaining traction in various research fields. To achieve the best outcomes, it’s crucial to understand the ins and outs of peptide storage and reconstitution. This comprehensive guide will walk you through essential tips for maintaining the highest quality and structural integrity of peptides.

Peptide Storage: Preserving Quality and Stability

Proper peptide storage is vital for maintaining the stability and integrity of lyophilised peptides. Peptides in their lyophilised (freeze-dried) form are safe for transport as they are protected from UV light and remain stable in this state. However, we recommend refrigerating them as soon as possible upon arrival to ensure proper storage and extend their longevity.

Peptides (Powder form) stored at -20°C in a freezer will remain stable for up to 48 months, making this ideal for long-term storage. 

When you receive peptides, it’s best to store them immediately in your refrigerator (2-8°C) or freezer (-20°C) for extended preservation. 

Note: Peptides degrade gradually over time, and degradation doesn’t mean reduced integrity initially. However, as peptides break down, they can lose their structure and charge, leading to fragmentation and eventual loss of structural integrity.

For an easy way to estimate how long a peptide may remain stable under different research storage conditions.

Storage Duration Guidelines for Peptides

Type of Peptide

Lyophilised (powder) Storage Duration - Up to 48 months at -20°C

Reconstituted Storage Duration - Up to 12 weeks at 2-8°C

Lyophilised peptides are typically supplied in powder form, requiring peptide reconstitution. For best results, allow both the peptide vial and the mixing solution (e.g., bacteriostatic water) to reach room temperature before mixing. This helps avoid issues like cloudiness that may occur when cold solutions are combined.

Equalising Pressure in the Vial

When reconstituting, it’s essential to equalise the pressure in the vial. Due to the drying process, some vials may have a vacuum, while others could have positive pressure. To balance this, insert a sterile needle that’s half-filled with air into the vial's rubber stopper.

The vial will either draw in or release air, stabilising the pressure. This prevents solution loss once it’s added, as excess pressure may cause the solution to leak through the stopper.

Choosing the Right Solvent and Mixing Technique

Bacteriostatic water is commonly used for reconstitution.

Mixing: Gently swirl the vial until the peptide is fully dissolved. Avoid vigorous shaking, as this can damage the peptide structure.

Avoid Excessive Solution Volumes/Mixing Ratio

Adding too much solution can fragment and break down peptides. Use between 1 to 3 ml of solution for reconstitution unless specific studies confirm that a higher volume is safe. Excessive dilution can compromise peptide integrity, potentially reducing peptide integrity.

10mg vial + 2.5mL BAC water

20mg vial + 3ml BAC water

40mg vial + 3mL BAC water

60mg vial + 3mL BAC water.

Once reconstituted, store peptides at 2-8°C (fridge) do not freeze, typically for up to twelve weeks.