Reconstitution is the process of dissolving a lyophilized (freeze-dried) peptide in a suitable solvent to prepare it for research use. Correct technique preserves peptide integrity and ensures consistent concentration throughout the experiment. This guide covers general reconstitution principles for laboratory use.
For laboratory research use only. Not intended for human use or self-administration. Always follow your compound’s COA and product documentation.
Supplies Required for Reconstitution
- Lyophilized peptide vial (sealed, desiccated)
- Appropriate reconstitution solvent (see solvent selection below)
- Sterile syringe (appropriate volume)
- Alcohol swabs
- Sterile, depyrogenated storage vials if aliquoting
- Labelling materials (date, concentration, compound name)
Solvent Selection
Solvent choice depends on the peptide’s physicochemical properties. General guidance:
- Bacteriostatic water — suitable for many water-soluble peptides; inhibits microbial growth for extended storage
- Sterile water for injection (WFI) — clean baseline solvent for water-soluble peptides
- Dilute acetic acid (0.1–1%) — often used for basic/positively charged peptides that are poorly water-soluble
- DMSO — for highly hydrophobic peptides; can be diluted into aqueous buffer after initial dissolution
Always verify solubility characteristics for your specific peptide before proceeding. Published solubility data is typically available in the scientific literature or from the compound’s documentation.
General Reconstitution Steps
- Allow vial to reach room temperature — prevent condensation from entering vial during opening
- Clean vial top — wipe the rubber septum or cap with an alcohol swab; allow to dry
- Draw solvent — load the appropriate volume of solvent into a clean, sterile syringe
- Inject slowly — insert needle and inject solvent slowly down the inner wall of the vial; do not direct it onto the lyophilized cake directly
- Allow to dissolve — gently swirl the vial until the peptide is fully in solution; do not vortex or shake vigorously
- Inspect — solution should be clear; cloudiness or particulates may indicate incomplete dissolution or solubility issues
- Label and store — immediately label with compound name, concentration, solvent, and date; refrigerate at 2–8°C
Calculating Concentration
To achieve a target concentration, use the formula:
Volume of solvent (mL) = Mass of peptide (mg) ÷ Target concentration (mg/mL)
Example: 5 mg of peptide reconstituted in 1 mL of solvent = 5 mg/mL solution.
Always account for the molecular weight of your specific peptide when preparing molar concentration solutions (e.g., μmol/mL or nmol/mL).
Post-Reconstitution Storage
Reconstituted peptides are significantly less stable than lyophilized powder. See our Peptide Storage Guide for full post-reconstitution storage protocols. As a general rule: refrigerate at 2–8°C, protect from light, use within 28 days, and avoid repeated temperature fluctuations.
Related Resources
- What Are Peptides? — Introduction to peptide science
- Peptide Storage Guide — Storage conditions and best practices
- Our Quality & Purity Standards — HPLC, MS, and COA overview
Disclaimer: All content on this page is for educational and informational purposes only. TrueCanPeptides products are sold for laboratory research use only. Not intended for human use, therapeutic application, or self-administration. Consult qualified professionals for any medical, clinical, or regulatory questions.
See also: reconstitution calculator