Phytochemical Analysis andin vitroFree‐Radical‐Scavenging Activities of the Essential Oils from Leaf and Fruit ofMelaleuca leucadendraL.

Abstract

The phytochemical profile of Melaleuca leucadendra L. leaf and fruit oils from Cuba was investigated by GC and GC/MS. Forty-one and sixty-four volatile compounds were identified and quantified, accounting for 99.2 and 99.5% of the leaf-oil and fruit-oil total composition, respectively. The main components were 1,8-cineol (43.0%), viridiflorol (24.2%), α-terpineol (7.0%), α-pinene (5.3%), and limonene (4.8%) in the leaf oil, and viridiflorol (47.6%), globulol (5.8%), guaiol (5.3%), and α-pinene (4.5%) in the fruit oil. The antioxidant capacity of these essential oils was determined by three different in vitro assays (2,2-diphenyl-1-picrylhydrazyl (DPPH) radical, thiobarbituric acid reactive species (TBARS), and 2,2'-Azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical cation), and significant activities were evidenced for all of them.

Mosquito Larvicidal Activity, Antimicrobial Activity, and Chemical Compositions of Essential Oils from Four Species of Myrtaceae from Central Vietnam

“…They were both dominated by 1,8-cineole (43.0% and 48.7%, respectively), but these two samples were also rich in viridiflorol (24.2% and 27.8%, respectively), and therefore, may represent a subtype of chemotype I. An agglomerative hierarchical cluster analysis was carried out using the M. leucadendra leaf essential oil compositions reported in the literature [14,[36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] (Figure 3). The cluster analysis reveals two sub-types of chemotype I, the two sub-types of chemotype II, as described by Brophy [14], and chemotype III, the nerolidol chemotype.…”

Comparative Evaluation of Antioxidant Activities of Ethanol Extracts and Their Solvent Fractions Obtained from Selected Miscellaneous Cereal Grains

“…To evaluate antioxidant properties of miscellaneous cereal grains, which were harvested in Korea, including proso millet, yellow glutinous proso millet, hwanggeumchal sorghum, glutinous sorghum, white glutinous sorghum, yellow glutinous foxtail millet, non-glutinous foxtail millet, green glutinous foxtail millet, golden foxtail millet, barnyard millet and adlay, the free radical-scavenging activities of 80% ethanol extracts prepared from the individual grains were measured using DPPH and ABTS methods, both of which have widely been employed to evaluate free radical-scavenging activities of natural compounds in foods and biological systems [34,43]. As shown in Table 1, the 80% ethanol extract of hwanggeumchal sorghum grains exhibited the highest DPPH radical-scavenging activity followed by those of glutinous sorghum and barnyard millet grains.…”

Efficacy of commercially available products against Gyrodactylus turnbulli infections on guppies Poecilia reticulata

“…Both terpenes and phenols are generally dominant in essential oils and are well known for their anti-microbial properties (Gershenzon & Dudareva 2007, Bakkali et al 2008, Hammer & Carson 2011. Cajuput was dominated by 1, 8-cineole (Farag et al 2004, Piño et al 2010. Importantly, in cajuput oil 1, 8-cineole co-occurs with limonene: the combination of these constituents may cause antagonistic, synergistic, or additive interactions against microbes depending on the ratio and the limonene entantiomer present (van Vuuren & Viljoen 2007).…”

“…Both oils show strain-specific efficacy against microbes (Burt & Reinders 2003, Saenz et al 2004) and may reduce the transmission of vector-borne diseases (George et al 2010, Greive et al 2010; however, such effects may be dependent on seasonal and geographical variation in essential oil constituents (Burt 2004). Cajuput, for instance, varies significantly in its chemotype depending on its origin, but overall is dominated by terpenes (Cuong et al 1994, De Colmenares et al 1998, Farag et al 2004, Piño et al 2010. West Indian bay, on the other hand, appears to be dominated by a mixture of phenols and some terpenes (Nadal et al 1973, McHale et al 1977, with both chemical groups generally showing anti-microbial efficacy (Gershenzon & Dudareva 2007, Hammer & Carson 2011.…”