How to Reconstitute PAL-GHK: Complete Laboratory Reconstitution Guide
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How to Reconstitute PAL-GHK: Complete Laboratory Reconstitution Guide
PAL-GHK (Palmitoyl-GHK, N-palmitoyl-Gly-His-Lys, MW 578.80 g/mol) is a lipopeptide comprising the GHK copper-binding tripeptide with a palmitoyl fatty acid modification at the N-terminus. The palmitoyl group enhances skin penetration and membrane interaction properties. It is supplied as a lyophilised powder in a 10mL sterile glass vial containing 10mg. The lipophilic modification requires specific solvent consideration for reconstitution compared to water-soluble unmodified peptides.
Materials Required
- PAL-GHK 10mg lyophilised vial
- Bacteriostatic water (BAC water) or PBS — 10mL vial
- Ethanol (96% sterile) for co-solvent if needed
- 1mL or 2mL sterile syringe with needle
- Alcohol swabs (70% isopropyl)
- Nitrile gloves
- Permanent marker for labelling
Important Note on Solubility
PAL-GHK's palmitoyl modification makes it significantly more hydrophobic than unmodified GHK. For aqueous reconstitution, the powder may not fully dissolve in BAC water alone at high concentrations. A co-solvent approach is recommended: dissolve PAL-GHK first in a small volume of sterile ethanol (10–20% of final volume) and then bring to final volume with BAC water or PBS. This produces a clear or slightly opalescent stock solution suitable for further dilution into aqueous assay systems.
Step-by-Step Reconstitution Protocol
Step 1 — Prepare workspace. Wipe work surface with 70% isopropyl alcohol. Allow to dry. Wear nitrile gloves.
Step 2 — Swab vial stopper. Clean the rubber stopper with a fresh alcohol swab. Air dry 10 seconds.
Step 3 — Add a small volume of sterile ethanol. Draw 0.2mL of sterile 96% ethanol into a syringe and inject slowly into the PAL-GHK vial, directing along the glass wall. This initial ethanol addition wets the lipophilic powder surface.
Step 4 — Swirl briefly. Gently swirl for 15 seconds to begin dissolution in ethanol.
Step 5 — Add BAC water to final volume. Add 1.8mL of BAC water (for a 2mL total volume) slowly along the vial wall. Swirl gently for 30–60 seconds to mix. The final solution may appear slightly opalescent — this is normal for palmitoyl-modified peptides at concentrations above their aqueous solubility limit.
Step 6 — Inspect and label. Label with reconstitution date, solvent composition (10% ethanol/BAC water), concentration, and initials.
Resulting Concentration
Adding 2mL total solvent (0.2mL ethanol + 1.8mL BAC water) to a 10mg PAL-GHK vial yields a stock concentration of 5mg/mL. For dermal fibroblast and extracellular matrix cell model studies, working concentrations of 1ng/mL to 100mcg/mL are prepared by serial dilution into serum-free media. Include ethanol vehicle controls matched to the final ethanol concentration in working dilutions.
Concentration Reference Table
| Total Solvent Volume | Resulting Concentration |
|---|---|
| 1mL (0.1mL EtOH + 0.9mL BAC) | 10.0mg/mL |
| 2mL (0.2mL EtOH + 1.8mL BAC) | 5.0mg/mL |
| 4mL (0.4mL EtOH + 3.6mL BAC) | 2.5mg/mL |
Storage Conditions and Stability
Store lyophilised PAL-GHK at −20°C prior to reconstitution, protected from light. Once reconstituted, store at 2–8°C. Reconstituted PAL-GHK is stable for up to 14 days under refrigeration. The ethanol co-solvent reduces the benzyl alcohol effectiveness of BAC water — prepare smaller volumes if extended storage is required. For long-term aliquot storage, freeze at −80°C in single-use aliquots.
Research Application Notes
PAL-GHK's collagen synthesis and ECM remodelling research applications in dermal fibroblast cell models follow the same receptor pharmacology framework as unmodified GHK-Cu, but the palmitoyl modification enhances membrane interaction which may affect uptake kinetics in cell model assay systems. When comparing PAL-GHK with unmodified GHK in matched cell model assays, account for the ethanol co-solvent by including equivalent-concentration ethanol vehicle controls in all assay conditions. PAL-GHK 10mg vials are available from Pinnacle Peptides, verified at ≥99% purity by HPLC and mass spectrometry.
All content is intended for in vitro laboratory research purposes only. Not for human or animal consumption. Not intended to diagnose, treat, cure, or prevent any condition.
