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首页> 外文期刊>African Journal of Agricultural Research >Composition, radical scavenging and antifungal activities of essential oils from 3 Helichrysum species growing in Cameroon against Penicillium oxalicum a yam rot fungi
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Composition, radical scavenging and antifungal activities of essential oils from 3 Helichrysum species growing in Cameroon against Penicillium oxalicum a yam rot fungi

机译：喀麦隆生长的3种蜡菊属植物的精油对草酸青霉（Penicillium oxalicum）和山药腐烂真菌的组成，自由基清除和抗真菌活性

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The chemical composition of essential oils from leaves of?Helichrysumcameroonense?Hutch. and Dalziel,?Helichrysum?cymosum?Sensu C. D. Adam, Helichrysum globosum?Sch. Bip. ex?A. Rich. and flowers of?Helichrysumcameroonense?was examined by means of GC and GC-MS. In addition, the radical scavenging and antifungal activities were assayed according to the DPPH (Diphenyl Picryl Hydrazyl) and dilution methods respectively. The results showed a predominance of monoterpenes in the oils of the leaves (89.5%) and flowers (62.9%) of?H.?cameroonense?and of sesquiterpenes (58.0%) in that of?H. cymosum.?Extract from?H.?globosum?was characterized by comparable proportions of monoterpenes (49.6%) and sesqiterpenes (49.1%).?The major components were found to be?a-pinene?(46.4%) and camphor (11.5%) in the oil of leaves of?H. cameroonense?while?a-pinene?(31.4%) and guaienol?(18.9%) were those from the flowers of the same specie. ?-3-Carene (16.1%) and?b-caryophyllene (12.0%) were the predominant compounds of the essential oils ofH.?cymosum?and?a-pinene?(36.6%), valerianone (10.9%) were those of?H.globosum.?The radical scavenging activities of essential oils from the leaves of?H.cameroonense?and?H. cymosum?were found to be 4.9 and 6.3 g/l respectively while butylated hydroxy toluene (BHT) used as reference has a SC50?=7.0 mg/l, On another hand, the essential oils from the leaves of these?Helichrysum?species showed significant antifungal activities against?Penicillium?oxalicum, with percent inhibition at 5 mg/ml ranging from 54.7 to 100%. These results highlight the potential of some essential oils as an alternative tool to fight this pathogen which is one of the most prevailing causing agent of soft rot of post harvest yam tuber.
机译：蜡菊属植物叶的精油的化学成分。和Dalziel，“蜡菊属植物”或“ Cymosum”？ ip例如？丰富。并通过GC和GC-MS检查了Helichrysumcameroonense的花。此外，自由基清除和抗真菌活性分别根据DPPH（联苯基Picryl Hydrazyl）和稀释方法进行测定。结果表明，在“ H.喀麦隆香”的叶（89.5％）和花（62.9％）和在“ H”中的倍半萜（58.0％）的油中，单萜类占主导地位。提取物的特征是可比比例的单萜类（49.6％）和倍半萜类（49.1％）。主要成分是α-pine烯（46.4％）和樟脑（11.5）。 ％）在？H的叶子油中。喀麦隆香气中，a-pine烯（31.4％）和愈创木酚（18.9％）来自同一物种的花。 α-3-胡萝卜素（16.1％）和αb-石竹烯（12.0％）是H.cymosum？和？a-pinene？（36.6％），缬草酮（10.9％）的主要成分。 “ H.globosum”。从喀麦隆H.喀麦隆和H.H的叶子中清除精油的自由基活性。 cymosum？的含量分别为4.9 g / l和6.3 g / l，而丁基羟基甲苯（BHT）的SC50？= 7.0 mg / l。另一方面，这些蜡菊属植物叶片的精油显示对草酸青霉有显着的抗真菌活性，在5 mg / ml时抑制百分率在54.7至100％之间。这些结果突显了某些精油作为对抗这种病原体的替代工具的潜力，该病原体是收获后山药块茎软腐的最普遍原因。

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