Objective:To investigate antioxidant and antibacterial activities of Callistemon viminalis(C.viminalis)leaves.Methods:The essential oil of C.viminalis leaves obtained by hydrodistillation was analyzed by GC/MS.Differe...Objective:To investigate antioxidant and antibacterial activities of Callistemon viminalis(C.viminalis)leaves.Methods:The essential oil of C.viminalis leaves obtained by hydrodistillation was analyzed by GC/MS.Different extracts were tested for total phenolic and flavonoid contents and in vitro antioxidant(DPPH assay)and antibacterial(agar disc diffusion and 96-well micro-plates methods)actives.Results:Fourteen components were identified in the essential oil,representing 98.94%of the total oil.The major components were 1,8-cineole(64.53%)andα-pinene(9.69%).Leaf essential oil exhibited the highest antioxidant activity of(88.60±1.51)%comparable to gallic acid,a standard compound[(80.00±2.12)%].Additionally,the biggest zone of inhibitions against the studied bacterial strains was observed by the essential oil when compared to the standard antibiotic(tetracycline).The crude methanol extract and ethyl acetate fraction had a significant antibacterial activity against the tested bacterial strains.Conclusions:It can be suggested that C.viminalis is a great potential source of antibacterial and antioxidant compounds useful for new antimicrobial drugs from the natural basis.The present study revealed that the essential oil as well as the methanol extracts and ethyl acetate fraction of C.viminalis leaves exhibited highly significant antibacterial activity against the tested bacterial strains.展开更多
上海地区种植的香桃木(Myrtus communis L.)用水蒸气蒸馏法提取叶片中的精油,采用GC和GC-MS对其化学成分进行分析鉴定;并进一步对不同生长期,以及干、鲜叶中精油组分和含量的变化作了对比分析。结果表明:在研究中,鉴定出了36种精油成分...上海地区种植的香桃木(Myrtus communis L.)用水蒸气蒸馏法提取叶片中的精油,采用GC和GC-MS对其化学成分进行分析鉴定;并进一步对不同生长期,以及干、鲜叶中精油组分和含量的变化作了对比分析。结果表明:在研究中,鉴定出了36种精油成分,其中萜烯类14种,酯9种,醇7种,萜类氧化物3种,醛、酮、酚各1种。初花期的精油含有率(2.5mL·kg-1)略高于结实期(2.3mL·kg-1),结实期干叶精油含有率(2.17mL·kg-1)略低于鲜叶。在这两种情况下,精油组分没有明显的变化。初花期鲜叶主成分为:乙酸桃金娘烯酯(36.93%)、芳樟醇(14.80%)、1,8-桉叶油素(15.80%)、α-蒎烯(12.64%)、桃金娘烯醇(5.54%);结实期鲜叶主成分为:乙酸桃金娘烯酯(31.83%)、芳樟醇(21.48%)、1,8-桉叶油素(15.39%)、α-蒎烯(10.32%)、桃金娘烯醇(4.69%);结实期干叶主成分:乙酸桃金娘烯酯(35.34%)、芳樟醇(18.48%)、1,8-桉叶油素(15.86%)、α-蒎烯(10.64%)、桃金娘烯醇(4.47%)。展开更多
基金funded by the Deanship of Scientific Research at King Saud University with the research group project No.RGP-VPP-010
文摘Objective:To investigate antioxidant and antibacterial activities of Callistemon viminalis(C.viminalis)leaves.Methods:The essential oil of C.viminalis leaves obtained by hydrodistillation was analyzed by GC/MS.Different extracts were tested for total phenolic and flavonoid contents and in vitro antioxidant(DPPH assay)and antibacterial(agar disc diffusion and 96-well micro-plates methods)actives.Results:Fourteen components were identified in the essential oil,representing 98.94%of the total oil.The major components were 1,8-cineole(64.53%)andα-pinene(9.69%).Leaf essential oil exhibited the highest antioxidant activity of(88.60±1.51)%comparable to gallic acid,a standard compound[(80.00±2.12)%].Additionally,the biggest zone of inhibitions against the studied bacterial strains was observed by the essential oil when compared to the standard antibiotic(tetracycline).The crude methanol extract and ethyl acetate fraction had a significant antibacterial activity against the tested bacterial strains.Conclusions:It can be suggested that C.viminalis is a great potential source of antibacterial and antioxidant compounds useful for new antimicrobial drugs from the natural basis.The present study revealed that the essential oil as well as the methanol extracts and ethyl acetate fraction of C.viminalis leaves exhibited highly significant antibacterial activity against the tested bacterial strains.
文摘上海地区种植的香桃木(Myrtus communis L.)用水蒸气蒸馏法提取叶片中的精油,采用GC和GC-MS对其化学成分进行分析鉴定;并进一步对不同生长期,以及干、鲜叶中精油组分和含量的变化作了对比分析。结果表明:在研究中,鉴定出了36种精油成分,其中萜烯类14种,酯9种,醇7种,萜类氧化物3种,醛、酮、酚各1种。初花期的精油含有率(2.5mL·kg-1)略高于结实期(2.3mL·kg-1),结实期干叶精油含有率(2.17mL·kg-1)略低于鲜叶。在这两种情况下,精油组分没有明显的变化。初花期鲜叶主成分为:乙酸桃金娘烯酯(36.93%)、芳樟醇(14.80%)、1,8-桉叶油素(15.80%)、α-蒎烯(12.64%)、桃金娘烯醇(5.54%);结实期鲜叶主成分为:乙酸桃金娘烯酯(31.83%)、芳樟醇(21.48%)、1,8-桉叶油素(15.39%)、α-蒎烯(10.32%)、桃金娘烯醇(4.69%);结实期干叶主成分:乙酸桃金娘烯酯(35.34%)、芳樟醇(18.48%)、1,8-桉叶油素(15.86%)、α-蒎烯(10.64%)、桃金娘烯醇(4.47%)。
