| Summary: | Essential oils (EOs) were extracted from <i>Eugenia patrisii</i>, <i>E. punicifolia</i>, and <i>Myrcia tomentosa,</i> specimens A and B, using hydrodistillation. Gas chromatography coupled with mass spectrometry (GC/MS) was used to identify the volatile constituents present, and the antioxidant capacity of EOs was determined using diphenylpicryl-hydrazyl (DPPH) and trolox equivalent antioxidant capacity (TEAC) assays. For <i>E. patrisii</i>, germacrene D (20.03%), bicyclogermacrene (11.82%), and (<i>E</i>)-caryophyllene (11.04%) were identified as the major constituents of the EOs extracted from specimen A, whereas specimen B primarily comprised γ-elemene (25.89%), germacrene B (8.11%), and (<i>E</i>)-caryophyllene (10.76%). The EOs of <i>E. punicifolia</i> specimen A contained β-Elemene (25.12%), (<i>E</i>)-caryophyllene (13.11%), and bicyclogermacrene (9.88%), while specimen B was composed of (<i>E</i>)-caryophyllene (11.47%), bicyclogermacrene (5.86%), β-pinene (5.86%), and γ-muurolene (5.55%). The specimen A of <i>M</i>. <i>tomentosa</i> was characterized by γ-elemene (12.52%), germacrene D (11.45%), and (<i>E</i>)-caryophyllene (10.22%), while specimen B contained spathulenol (40.70%), α-zingiberene (9.58%), and γ-elemene (6.89%). Additionally, the chemical composition of the EOs was qualitatively and quantitatively affected by the collection period. Furthermore, the EOs of the studied specimens, especially specimen A of <i>E. punicifolia</i>, showed a greater antioxidant activity in DPPH rather than TEAC, as represented by a significantly high inhibition percentage (408.0%).
|
|---|
