Recent statistics show a rise in the margin of consumption and utilization of essential oils. People
have turned their attention to traditional medicines, and so the demand for essential oils in the
international market has increased drastically. However, essential oil extraction processes have
been observed to suffer from minimum output levels. The purpose of this study was to
investigate the effects of changing the process parameters (time of extraction, leaf sizes and
leaves to water ratio) and their contribution to maximizing the process of extraction and also the
composition of Eucalyptus grandis oil to establish utility of the oil.The extracted oil’s refractive
index was determined and GC-MS analysis of the oil was also done to determine the
composition of the oil. There was an increase of %yield with increase in time up to 150
minutes.Quality of the oil extract was desirable from appearance and smell. Variation in oil yield
was also noted from varying the leaves to water ratio, with 1:12.5 (w/v) being optimal. The
adjustment of leaf sizes was found to be most effective with a very high increase in yield margin.
The whole leaves produced the highest amounts of oil. More than 20 compounds were identified
with many of them appearing in eucalyptus oil from other species seen in literature.
Key Words: Essential Oils, Eucalyptus grandis, Clevenger Distillation, Optimization, GC-MS