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- Chemical composition and acetylcholinesterase inhibition of the essential
oil of Cyathocalyx pruniferus (Maingay ex Hook.f. & Thomson) J.Sinclair
Authors: Wan Mohd Nuzul Hakimi Wan SALLEH ; Shamsul KHAMİS , Muhammad Helmi NADRİ̇ , Hakimi KASSİM , Alene TAWANG
Abstract: The chemical composition and acetylcholinesterase inhibitory activity of the essential oil from the leaf of Cyathocalyx pruniferus growing in Pahang, Malaysia was investigated for the first time. The essential oil was obtained by hydrodistillation and fully characterized by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). A total of thirty chemical components (95.53%) were successfully identified in the essential oil which was characterized by high proportions of α-pinene (25.40%), germacrene D (20.20%), β-caryophyllene (10.78%), and δ-cadinene (6.44%). Acetylcholinesterase inhibitory activity was evaluated against the Ellman method, and the essential oil showed good inhibition against acetylcholinesterase (I: 75.5%) assay. To the best of our knowledge, this is the first study of the composition of the essential oil report concerning the genus Cyathocalyx.
PubDate: Thu, 31 Dec 2020 00:00:00 +030
- Characterization of Dysphania ambrosioides (L.) Mosyakin & Clemants
essential oil from Vietnam
Authors: Tran Thi Kim NGAN ; Pham Minh QUAN , Tran Quoc TOAN
Abstract: DDysphania ambrosioides (L.) Mosyakin & Clemants is a fragrant herb widely distributed from warm temperate regions to subtropical and tropical regions of the Northern Hemisphere. The essential oil from D. ambrosioides is the main ingredient used in traditional medicine due to its anti-malarial, anti-cancer, and anti-helminthic properties, among others. The chemical composition of D. ambrosioides essential oil from the aerial part was extracted by hydrodistillation and analysis by gas chromatography-mass spectrometry, resulting the yield of 0.8%. The main components were characterized as 2,3-dehydro-1,4-cineole (55%), α-terpinene (15.2%), iso-ascaridole (15.3%), and p-cymene (9.8%), respectively.
PubDate: Thu, 31 Dec 2020 00:00:00 +030
- Extraction process optimization and characterization of the Pomelo (Citrus
grandis L.) peel essential oils grown in Tien Giang Province, Vietnam
Authors: Dao Tan PHAT ; Kha Chan TUYEN , Xuan Phong HUYNH , Tran Thanh TRUC
Abstract: Hydrodistillation was used to obtain the essential oil from pomelo (Citrus grandis L.) peels collected in Vietnam. The effects of extraction variables including size of material, temperature, extraction time, and water-to-material ratio on the yield of essential oil were investigated. In addition, to assess the quality of pomelo essential oil, the chemical composition was compared. The optimized conditions were as follows: material size of grind, temperature 120 °C, water to material ratio 5 mL/g, and extraction time 105 min., respectively. The chemical composition of the pomelo oil was then determined by GC-MS, where 5 components were identified, of which, limonene was the highest (97.1%). This method can be considered as a green method of extraction method as it is less energy intensive process and offers high performance. The results are expected to aid in justification of hydrodistillation in industrial applications and in refining of extraction parameters.
PubDate: Thu, 31 Dec 2020 00:00:00 +030
- Bioactivity evaluation of the native Amazonian species of Ecuador: Piper
lineatum Ruiz & Pav. essential oil
Authors: Eduardo VALAREZO ; Gabriela MERİNO , Claudia CRUZ-ERAZO , Luis CARTUCHE
Abstract: In the present research, the essential oil from Piper lineatum Ruiz & Pav. was analysed by GC/MS and GC/FID, respectively. A total of thirty-seven chemical compounds were identified, which represented 98.9% of the essential oil composition. The main compounds were apiole (21.5%), safrole (19.2%), and myristicin (13.8%), respectively. The in vitro antimicrobial activity and antifungal activity of the oil was assayed against two Gram positive bacteria, five Gram negative bacteria and two fungi. The essential oil from P. lineatum showed an inhibitory activity against Gram-positive bacterium Klebsiella pneumoniae (ATCC 9997), and against dermatophytic fungus Trichophyton rubrum (ATCC 28188) with a MIC of 500 μg/mL in both cases. The antioxidant activity of essential oil was explored using DPPH and ABTS radical scavenging method, by means of both assays the essential oil showed a weak antioxidant activity. To the best of our knowledge, this is the first report on the chemical composition and biological activity of essential oil from this species.
PubDate: Thu, 31 Dec 2020 00:00:00 +030
- Essential oil composition and antioxidant activity of Reinwardtiodendron
cinereum Mabb. (Meliaceae)
Authors: Wan Mohd Nuzul Hakimi Wan SALLEH ; Shamsul KHAMİS , Muhammad Helmi NADRİ , Hakimi KASSİM , Alene TAWANG
Abstract: This study was designed to investigate the chemical composition and antioxidant activity of the essential oil from Reinwardtiodendron cinereum (Hiern) Mabb. growing in Malaysia. The essential oil was obtained by hydrodistillation and fully analysed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The analysis led to the identification of thirty-five components representing 83.6% of the total oil. The most abundant components were α-zingiberene (15.4%), pimaradiene (10.1%), (E)-caryophyllene (7.5%), and β-elemene (6.3%). The antioxidant activity was determined by DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging, total phenolic content, and β-carotene linoleic acid bleaching assays. The essential oil showed weak activity in DPPH radical scavenging (IC50 value of 105.2 μg/mL), phenolic content (45.5 ± 0.2 mg GA/g), and β-carotene linoleic acid bleaching (52.5 ± 0.2%) assays. To the best of our knowledge, this is the first study of the chemical composition and antioxidant activities of the essential oil report concerning the genus Reinwardtiodendron.
PubDate: Thu, 31 Dec 2020 00:00:00 +030
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