In this analysis, the specific gravity and refractive index of ten ethanolic rosemary essential oil solutions of increasing concentration have been studied, and data has been established to allow for an easy approximation of the concentration of fresh rosemary extracted into pure ethanol. Using a plot of specific gravity vs. concentration of the essential oil/ethanol solutions, the concentration of a tincture prepared from fresh rosemary clippings procured in the spring has been estimated and compared to that of a tincture made with fresh rosemary samples obtained in the fall with the expectation that the plant will have a different chemical makeup at different times of the year. The project was then extended using refractive index, and the results were compared to those obtained from specific gravity.

Specific gravity and refractive index studies of salvia rosmarinus in ethanol

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ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.