For laboratory and research purposes only. Not for human consumption. This guide describes general handling of lyophilized research peptides in a laboratory setting.
What you need
- Lyophilized research peptide vial
- Bacteriostatic water (0.9% benzyl alcohol)
- U-100 insulin syringes (1 mL preferred for measurement clarity)
- Alcohol swabs
- Sharps container
Step-by-step reconstitution
- Allow both the lyophilized peptide vial and the bacteriostatic water vial to reach room temperature.
- Sanitize the rubber stopper of each vial with a fresh alcohol swab.
- Draw the chosen volume of bacteriostatic water into a clean insulin syringe.
- Insert the needle into the peptide vial at an angle and let the water run gently down the side wall. Never spray directly onto the lyophilized powder.
- Gently swirl the vial until the powder is fully dissolved. Do not shake.
- Label the vial with the date, peptide name and final concentration. Store at 2-8°C and use within the bacteriostatic stability window (typically ~28 days).
Dosage math made simple
The amount of peptide you draw is determined by three numbers: the total mg of peptide in the vial, the total mL of bacteriostatic water you used, and the desired dose in mcg or mg.
Concentration = total peptide mg / total water mL
Volume to draw = desired dose / concentration
Example: 10 mg peptide reconstituted in 2 mL BAC water, targeting a 250 mcg dose
- Concentration = 10 mg / 2 mL = 5 mg/mL = 5000 mcg/mL
- Volume to draw = 250 mcg / 5000 mcg/mL = 0.05 mL
- On a U-100 insulin syringe, 0.05 mL = 5 units.
Quick reference: BAC water volume per vial size
| Vial | BAC water | Final concentration | 250 mcg = ?? IU on U-100 |
|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 5 IU |
| 10 mg | 2 mL | 5 mg/mL | 5 IU |
| 10 mg | 1 mL | 10 mg/mL | 2.5 IU |
| 20 mg | 2 mL | 10 mg/mL | 2.5 IU |
Storage
- Unreconstituted lyophilized peptide: -20°C long term, 2-8°C for short term.
- Reconstituted peptide in BAC water: 2-8°C, used within ~28 days.
- Aliquoting: for time-course experiments, split into single-use aliquots to avoid repeated freeze-thaw cycles.
- Light: store in an opaque box; some peptides are photosensitive.
Common mistakes
- Shaking the vial: can denature the peptide. Always swirl.
- Using sterile water instead of BAC water: sterile water lacks preservative and the reconstituted solution must be used immediately or discarded.
- Forgetting to label: always record date, peptide and concentration. Mislabeled vials are the most common cause of failed experiments.
- Reconstituting cold vials: condensation can affect dissolution. Bring to room temperature first.
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