We are studying about essential oil of some plant again of antimicrobial, we want use concentration by ppm, how can preparation this concentration and which solvent we are use.
In studies involving essential oils, it is generally recommended to use dilutions due to the nature of the extracts. The concentration in ppm is determined by dissolving a specific mass (in mg) in 1 liter of the dilution solution. If you wish to work in ppm, I suggest weighing a specific amount of your essential oils in mg and then dissolving it in 1 liter of your chosen dilution solution.
For one of our studies, we used maize oil to dissolve essential oils.