4. EO chemistry
The EO can be extracted from various parts of plants
including the leaves, flowers, stem, seeds, roots and bark;
however, the composition of the EO can vary among different
parts of the same plant, such as, EO obtained from the
C. sativum seed has different composition from the EO of
C. sativum flower as well as cilantro (immature leaves)
(Table 2).