Specific gravity is a comparative ratio of the density of a given substance divided by the density of a reference substance, usually water. In this project, a quantitative specific gravity analysis of rosemary/ethanol solutions of increasing concentration has been investigated. Ten rosemary essential oil solutions were prepared in ethanol, and the specific gravity of each was determined. An extract of fresh rosemary in ethanol was then prepared, and the specific gravity of 5 different samples of this tincture, as it became more concentrated over time, was measured. Using a plot of specific gravity vs. concentration of the essential oil/ethanol solutions, the concentrations of the extract samples have been approximated. Since there currently is no well-established conversion from rosemary oil to extract, as there is in the case of other herbs, a goal of this project is to propose an acceptable conversion.

Quantitative specific gravity analysis of salvia rosmarinus in ethanol solutions

ACS Spring 2022

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