Reconstituting peptides is a crucial step in preparing them for research use. It involves mixing a lyophilized (freeze-dried) peptide with a sterile liquid—most commonly bacteriostatic water—to return it to a usable, injectable form. This guide walks through the process and helps you calculate dosages accurately.
🧪 What You’ll Need:
- Lyophilized peptide vial
- Bacteriostatic water (0.9% benzyl alcohol)
- Insulin syringe (1mL/100 units recommended)
- Alcohol prep pads
- Clean surface and sterile gloves (recommended)
🧬 Step-by-Step Reconstitution Instructions:
1. Sanitize Your Work Area
Wipe down your work surface and clean your hands. Use gloves if possible.
2. Clean the Vial Stoppers
Use alcohol prep pads to sterilize the rubber stoppers of both the peptide vial and bacteriostatic water.
3. Draw the Desired Volume of Bacteriostatic Water
Using a sterile insulin syringe, pull up the required volume of bacteriostatic water. A common range is 1–2 mL, depending on how concentrated you want the final solution.
4. Slowly Inject Water into the Peptide Vial
Insert the needle into the vial at a slight angle and allow the water to run slowly down the inside of the vial. Avoid shooting it directly onto the powder, which can denature delicate peptides.
5. Dissolve the Peptide Gently
Let the vial sit and swirl it slowly in a circular motion. Do not shake—this can damage the peptide structure. Within a minute or two, the powder should fully dissolve.
📏 Dosage Calculation Basics (mg, mL, and Units Only):
Once your peptide is reconstituted, you’ll want to know how much you’re drawing based on the volume (units) in your syringe.
🔢 Example:
You have a 10mg peptide vial, and you add 1mL of bacteriostatic water.
- That means 10mg per 1mL
- 1mL = 100 units on an insulin syringe
- Therefore: 10mg ÷ 100 units = 0.1mg (or 100 micrograms) per unit
If your desired dose is 2.5mg, divide:
- 2.5mg ÷ 0.1mg per unit = 25 units
Another Example – 2mL Reconstitution:
You reconstitute the same 10mg vial with 2mL of bacteriostatic water.
- 10mg ÷ 2mL = 5mg per mL
- 1mL = 100 units → 5mg ÷ 100 units = 0.05mg per unit
To get a 2.5mg dose:
- 2.5mg ÷ 0.05mg per unit = 50 units
General Rule:
mg per unit = Total mg in vial ÷ (mL added × 100) Then: Units to draw = Desired mg ÷ mg per unit
🧊 Storage and Stability
Once reconstituted, peptides should be refrigerated at 2–8°C (35–46°F) and used within 30 days for optimal integrity. Always inspect for cloudiness, discoloration, or particulates before each use.
📝 Disclaimer:
This information is provided strictly for educational and research purposes. Always follow institutional or laboratory protocols. Peptides are not intended for human or veterinary use.
