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多花含笑叶的挥发油成分研究 总被引:12,自引:0,他引:12
运用气相色谱-质谱-计算机联用技术,结合标准谱库,对昆明产多花含笑叶的挥发油成分进行了研究,分离鉴定了42个化合物,其中单萜16个,倍半萜21个,分别占精油总含量的21=21%和49.08%,主要成分为γ-木罗烯(12.04%),十六碳三烯酸甲酸(7.45%),兰桉醇(7.38%),1,8-桉叶素(5.76%),α-愈创木烯(5.64%),香桧烯(4.26%),十六碳二烯酸甲酯(4.26%),β-槛香烯(3.76%),β-蒎烯(3.20%)等。 相似文献
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臭灵丹中四个新的倍半萜酸 总被引:6,自引:0,他引:6
从云南省芒市产臭灵丹[Laggerapterodnta(DC.)Benth]中,分离得以4个新的桉烷型倍半萜酸,结构鉴定为5,12-二烯-桉烷-13-酸(1);1β-式-5,12-二烯-桉烷-13-酸(2);3β-羟基-5,12-二烯-桉烷-13-酸(3)。 相似文献
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乐东拟单性木兰花部挥发油的化学成分及其抑菌活性 总被引:9,自引:0,他引:9
采用GS-MS技术分析了乐东拟单性木兰花部挥发油的化学组成,共鉴定了57种成分的化学结构与相对含量,占总含量地85.59%。其中,β- 蒎烯(12.85%)、D-柠檬烯(7.78%)、石竹烯(4.89%)、十氢-4a-甲基-1-亚甲基-7-(1-甲基乙烯基)-萘(4.70%)为主要成分。此外,醇类中α-杜松醇(3.61%)、1氢-[1,3]环戊并[1,2]环戊并[1,2]环丙并-苯(3.52%)、倍半萜含氧衍生物石竹烯氧化物(3.33%)和α-蒎烯(3.22%)也占有较大比例。体外对4种供试病原菌的抑菌实验表明,该挥发油对大肠杆菌和伤寒杆菌有一定的抑制或杀灭能力。 相似文献
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对毛乌素沙地油蒿挥发油的化感作用(Alelopathy)及其化学成分进行了研究。结果表明:油蒿挥发油对苋、诸葛菜、萝卜种子萌发和幼苗生长具有不同程度的抑制作用;对小麦种子萌发几乎无影响,但对其幼芽和幼根的生长具一定影响。抑制作用最强的是对苋种子,挥发油组最终萌发率18%,比对照组减少71%,对其幼芽和幼根的生长影响也很明显。用GC、GC-MS-DS联用方法,共鉴定43个化合物,其中相对百分含量在1.5%以上的化合物有如下14种:1)α-蒎烯(α-pinene),2)桧烯(Sabinene),3)β-蒎烯(β-pinene),4)月桂烯(Myrcene),5)对伞花烃(ρ-cymene),6)柠檬烯(Limonene),7)β-水芹烯(β-phelan-drene),8)β-顺式罗勒烯(β-cis-ocimene),9)β-反式罗勒烯(β-trans-ocimene),10)松油烯-4-醇(Terpinen-4-ol),11)α-姜黄烯(α-curcumene),12)茵陈炔(Capilene),13)橙花叔醇(Nerolidol),14)匙叶桉油烯醇(Spathulenol)。 相似文献
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利用气相色谱-质谱-计算机(GC-MS-DS)联用技术,首次了长白Song木根部挥发油成分,鉴定出16个化合物,占总含量的92.88%,成分中以α-蒎烯为主,质量分数达50%以上,此外含有β-蒎烯,胡椒烯等。 相似文献
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毛喉鞘蕊花的微量成分 总被引:10,自引:0,他引:10
从唇形科毛喉鞘蕊花全草的氯仿提取物分离到2个新的微量成分,鞘蕊花戊素和已素。基于光谱分析,鞘蕊花戊素和已 素的化学结构分别鉴定为1α,7β-二乙酰氧基-8,13-环氧-6β羟基勒丹-14烯-11-酮(1)和7β-乙酰氧基-8,13环氧-6β,α-二羟基勒丹-14烯-11-酮(2)。 相似文献
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中国珍稀植物明党参嫩茎叶挥发油化学成分研究 总被引:10,自引:0,他引:10
采用毛细管气相色谱-质谱-计算机联用技术对明党参嫩茎叶挥发油的化学成分进行研究,从挥发油中鉴定出27种成分,占总油量的97.502%,其主要成分是Mang牛儿醇乙酸酯(46.636%),明党参炔(11.483%),β-金合欢烯(10.986%为阐明明党参特征性化学及茎叶的一切利用提供了依据。 相似文献
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从唇形科瘿花茶菜(Rabdosia rosthornii)叶的乙醚抽出物中分出2个新的微量成分,瘿花丙素和丁素。基于详细的光谱分析,包括应用二维核磁共振数据,瘿花丙素和化学结合分别确定为对映-11α-乙酰氧基-7β,13β,19-三羟基贝壳杉-16烯-15-酮(1)和对映-11α-乙酰氧基-7β,12β,14α-三羟基贝壳杉-16烯-15-酮(2)。 相似文献
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Profiles of SARS-CoV-2 RNA and Antibodies in Inpatients with COVID-19 not Related with Clinical Manifestation: A Single Centre Study 下载免费PDF全文
Zhao Li Gao Ruqin Lu Roujian Wang Huijuan Deng Yao Niu Peihua Jiang Fachun Huang Baoying Liang Jiwei Jia Jing Zhang Feng Wang Wenling Wu Guizhen Tan Wenjie 《中国病毒学》2021,36(5):1088-1092
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RICHARD E. NORRIS 《Botanical journal of the Linnean Society. Linnean Society of London》1991,106(1):1-40
Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera. 相似文献
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JOAN VALUÈS MONTSERRAT TORRELL NÚRIA GARCIA JACAS 《Botanical journal of the Linnean Society. Linnean Society of London》2001,137(4):399-407
Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted. 相似文献
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Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme
responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare
the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show
that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by
distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of
demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least
one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of
the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable
potent antiproliferative synthetic drugs. 相似文献
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正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases 相似文献
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