Phytochemical profile and antimicrobial activity of essential oils from two Syzygium species against selected oral pathogens.

Background: The genus Syzygium (Myrtaceae) comprises several essential oil-rich species that are utilized traditionally for treating tooth infections and toothache. The current study aimed to extract essential oils (EOs) from the leaves of Syzygium samarangense and Syzygium malaccense cultivated in Egypt for the first time and screen their antimicrobial potential against oral-related pathogens.

Methods: The intended EOs were extracted using hydrodistillation (HD) by boiling fresh leaves with distilled water; supercritical fluid (SF) by extracting the dried leaves using supercritical CO at 40 °C and 150 bar; and the headspace (HS) in which the fresh leaves were heated in a glass vial and the vaporized aroma were analyzed.

Variations in Tunisian borage essential oil profiles and their antioxidant activities during flowering.

This study was conducted to examine the chemical composition and antioxidant activity of the essential oils (EOs) of Borago officinalis stem during its flowering stage. The EO composition was characterised by high proportions of E,E-decadienal, the main compound of monoterpene hydrocarbon class, with values varying from 47.08% to 55.