Accurate dosing calculations are essential for reproducible research. Errors in concentration or volume can invalidate results or waste valuable materials.
Basic Formula
Concentration (mg/mL) = Total peptide (mg) ÷ Volume of solvent (mL)
Example: 5 mg peptide in 2.5 mL solvent = 2 mg/mL
Calculating Dose Volume
If your protocol calls for 0.5 mg per dose:
Volume (mL) = Desired dose (mg) ÷ Concentration (mg/mL)
Volume = 0.5 mg ÷ 2 mg/mL = 0.25 mL (250 µL)
Important Considerations
- Account for peptide content: Some products list “peptide content” (e.g., 98%)—adjust calculations if needed.
- Use appropriate units: Convert between mg, µg, and mL/µL carefully.
- Document everything: Record batch numbers, concentrations, and dates for reproducibility.
Double-Check
Always verify calculations before reconstitution. When in doubt, use a second researcher to confirm or use validated calculation tools.