Arithmetic for preparing a research solution from a lyophilised vial. Start from the quantity per draw and work back, so there is no guessing.
Lab preparation only. This page does concentration and volume arithmetic for laboratory work. It is not guidance for use of any kind, and nothing on it is a recommendation for use in humans or animals. Every product on this site is a research chemical, not approved by the TGA.
1. Your vial
Pick the compound to see its vial sizes, or type the amount on the label.
mg
Pick a compound above to see its vial sizes, or type the amount.
2. Quantity per draw
Enter the quantity you want in each draw. This works back to how much bacteriostatic water to add and how many units to draw on a 1 mL syringe marked in 100 units.
3. Already mixed?
If the water is already in the vial, enter it here to get the units for the quantity in step 2.
mL
How the sums work
Draws per vial = vial contents (mcg) ÷ quantity per draw (mcg). 1 mg is 1000 mcg.
Bacteriostatic water (mL) = vial contents (mcg) × units ÷ (quantity per draw (mcg) × 100). On a 1 mL syringe marked in 100 units, 1 unit is 0.01 mL.
Units already mixed = quantity per draw (mcg) ÷ concentration (mcg/mL) × 100. Concentration (mg/mL) is vial contents (mg) ÷ water added (mL).
Most lyophilised peptide vials hold 2 to 3 mL. Add the water slowly down the side of the vial and let it dissolve without shaking. Store reconstituted solutions refrigerated and record the date. The lab results page lists the measured content of each batch on file, which is the figure to use for the vial contents where it differs from the label.
Disclaimer
All products are sold strictly for research purposes only. Not for human consumption. Not approved by the TGA.
