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The article "Chemical Composition and Antioxidant Activity of the Leaf Essential Oil of Syzygium salicifolium" provides information on the chemical composition and antioxidant activity of the essential oil extracted from the leaves of Syzygium salicifolium, a tree native to India. The essential oil contains 47 constituents, with sesquiterpene hydrocarbons being the main group. The dominant components of the oil are β-vetivenene, γ-amorphene, δ-elemene, β-elemene, β-gurjunene, trans-dauca-4(11),7-diene, δ-selinene, and cis-muurol-5-en-4-α-ol. This study is the first to explore the volatile profile and antioxidant activity of the essential oil of this Indian endemic Syzygium species. [Extracted from the article]

This article examines the chemical composition and antityrosinase activity of the leaf essential oil of Litsea nitida, a tree native to Eastern Himalaya, Myanmar, and parts of India. Litsea is a genus of plants with over 300 species found in tropical Asia, the Pacific, Australia, and North and Central America. The essential oils of Litsea species have various medicinal and aromatic uses, and this study provides the first report on the chemical composition and tyrosinase activity of Litsea nitida's essential oil. The oil was found to contain sesquiterpene hydrocarbons, aldehydes, oxygenated diterpenes, and oxygenated monoterpenes. The document also mentions the chemical composition of the essential oil of Litsea glutinosa, collected from Bangladesh, and the presence of β-caryophyllene in other Litsea species. The tyrosinase inhibitory activity of Litsea nitida's essential oil was found to be less effective than kojic acid. The authors express gratitude for the support and facilities provided for the research. [Extracted from the article]

Sesquiterpene hydrocarbons (30.06%) constituted the principal class of compounds followed by ethers (22.07%), alkanes (15.84%), others compounds (10.78%), sesquiterpene alcohols (8.20%), oxygenated sesquiterpenes (4.32%), and oxygenated monoterpenes (2.42%). Though the chemical composition and pharmacological activities of essential oils isolated from I Rhamnus prinoides i and I R. alaternus i have been studied by Campbell et al. [[8]] and Chouitah et al. [[9]], respectively, to the best of our knowledge, there is no published report on the volatile profiling and the biological activities of the essential oil of I Rhamnus napalensis i . Among the essential oil and positive controls tested for DPPH assay, the leaf essential oil (39.16 ± 0.41 g/mL) showed significant antioxidant activity as compared to ascorbic acid (5.83 ± 0.19 g/mL) and BHT (22.04 ± 0.62 g/mL). [Extracted from the article]