Seasonal variation of volatile oil composition and antioxidant property of aerial parts of Syzygium paniculatum Gaertn. grown in the Eastern Cape,South Africa |
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Authors: | Sunday O Okoh Omobola O Okoh Anthony I Okoh |
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Institution: | 1. SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Alice, South Africa;2. Applied and Environmental Microbiology Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Alice, South Africa;3. sokoh@ufh.ac.za ofuzim2018@gmail.com;4. Department of Pure and Applied Chemistry, University of Fort Hare, Alice, South Africa |
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Abstract: | Syzygium paniculatum Gaertn of the family Myrtaceae is a medicinal and aromatic plant. The hydrodistilled volatile oil (VO) from the aerial parts was characterised by GC-MS and Kovat’s index, while the antioxidant property was investigated using spectrophotometric techniques. Antioxidant capacities of the aerial parts VOs range from 0.12 to 0.93?mg/mL in scavenging 2, 2-diphenyl-1-picrylhydrazyl radicals (DPPH?). Overall, 75 and 67 compounds were identified from the summer and winter VOs, respectively. The main compounds were α-pinene (33.13%), n-hexadecanoic acid (19.14%), limonene (14.26%), farnesol (14.21%), β-ocimene (13.04%), citronellol (12.67%), linoleic acid (11.50%), octahydro-1,4-dimethyl azulene (11.57%), citral (9.91%), phytol (5.07%), linolenic acid (4.85%) and thymol (2.23%). The bioavailability of citronellol, thymol, β-ocimene and linoleic acid, used as bactericidal, fungicidal and antioxidant agents in cosmetics and perfumery, suggests S. paniculatum potential as a natural food flavouring and source of antibiotics in this era of emerging multi-drug-resistant pathogens. |
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Keywords: | S paniculatum volatile oil linoleic acid citronellol thymol antioxidant |
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