CommercialOriganum compactumBenth. andCinnamomum zeylanicumBlume essential oils against natural mycoflora in Valencia rice

Abstract

Chemical composition of commercial Origanum compactum and Cinnamomum zeylanicum essential oils and the antifungal activity against pathogenic fungi isolated from Mediterranean rice grains have been investigated. Sixty-one compounds accounting for more than 99.5% of the total essential oil were identified by using gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). Carvacrol (43.26%), thymol (21.64%) and their biogenetic precursors p-cymene (13.95%) and γ-terpinene (11.28%) were the main compounds in oregano essential oil, while the phenylpropanoids, eugenol (62.75%), eugenol acetate (16.36%) and (E)-cinnamyl acetate (6.65%) were found in cinnamon essential oil. Both essential oils at 300 μg/mL showed antifungal activity against all tested strains. O. compactum essential oil showed the best antifungal activity towards Fusarium species and Bipolaris oryzae with a total inhibition of the mycelial growth. In inoculated rice grains at lower doses (100 and 200 μg/mL) significantly reduced the fungal infection, so O. compactum essential oil could be used as ecofriendly preservative for field and stored Valencia rice.

Screening of antifungal activity of 12 essential oils against eight pathogenic fungi of vegetables and mushroom

“…Some authors suggest that essential oils are significantly more effective than their major components, whereas others present conflicting results (Santamarina et al . ). Maietti et al .…”

Fabrication ofOriganum compactumessential oil nanoemulsions stabilized using Quillaja Saponin biosurfactant

“…According to Equation , the third power of droplet size increases linearly as a function of time during Ostwald ripening, as can be seen in Figure a for the prepared oregano oil‐in‐water emulsion containing 0.5% QS. Indeed, oregano oil consists of different components such as carvacrol and thymol which are relatively soluble in water (Santamarina, Roselló, Sempere, Giménez, & Blázquez, ; Sedaghat Doost et al, ), which makes these nanoemulsions prone to Ostwald ripening.…”

In vitro Antifungal Activity of Essential oils and Major Components against Fungi Plant Pathogens

“…Santamarina et al. () obtained a similar result from C. zeylanicum oil with eugenol (62%) as the major compound, as well as Wang et al. () who identified eugenol as the major component (79%).…”

“…Essential oils have been previously studied for chemical composition and antifungal activities. Santamarina et al (2015) obtained a similar result from C. zeylanicum oil with eugenol (62%) as the major compound, as well as Wang et al (2009) Adukwu et al (2016) obtained similar results from lemongrass EO with the same three major constituents but different variety (C. flexuosus) was composed by geranial (50%), neral (38%) and geraniol (8%).…”