藏药翁布的酚性成分研究

从藏药翁布(Myricaria germanica)的60％丙酮提取物中进行了进一步研究,从中共分离得到了11个化合物.利用光谱和波谱分析法,分别鉴定为阿魏酸(1),松柏醇(2),阿魏酸葡糖苷(3),异落叶松脂醇(4),咖啡酸(5),对羟基桂皮酸(6),没食子酸(7),3,5-二羟基-4-甲氧基苯甲酸(8),杜鹃醇(9),3-甲氧基-4-羟基-苯甲酸(10)和3,4,5-三羟基肉桂酸(11).化合物1～11均为首次从该植物中分得,其中1～6和8～11为首次从水柏枝属植物中分离得到.     

领春木枝叶化学成分的研究

为了研究领春木(Euptelea pleiospermum Hook.f.et Thoms)的化学成分,利用各种柱色谱及高压液相色谱等方法进行分离和纯化,根据理化性质和光谱数据分析鉴定了9个化合物。他们分别为:白桦脂酸(1);齐墩果酸(2);N-反式对羟基肉桂酰基-对羟基苯乙胺(3);N-反式阿魏酰酪胺(4);N-顺式阿魏酰酪胺(5);丁香脂素(6);N-顺式阿魏酰-3-甲氧基酪胺(7);N-反式阿魏酰-3-甲氧基酪胺(8);3-羟基-30-去甲基-20-酮基-28-羽扇豆酸(9)。所有化合物均为首次从领春木中分离得到。     

湖北旋覆花化学成分的研究(英文)

从湖北旋覆花(Inula hupehensis)地上部分分离得到19个化合物,经波谱数据分析分别鉴定为9-羟基-百里香酚(1),8,10-去氢-β-羟基-百里香酚(2),2-羟基-4-甲基苯乙酮(3),8,9-双羟基-9-百里香酚(4),10-羟基-8,9-双氧亚异丙基百里香酚(5),8,10-二羟基-9-异丁酰百里香酚(6),8-羟基-9-异丁酰-10-(2-甲基丁酰)百里香酚(7),8,9,10-三羟基百里香酚(8),8-羟基-9,10-二异丁酰百里香酚(9),neoechinulin A(10),3-醛基吲哚(11),3-羟乙酰基吲哚(12),丁香酸(13),4,6-二羟基-2-甲氧基苯乙酮(14),7-甲氧基-8-羟基香豆素(15),6-甲氧基山奈酚(16),(+)-正丁香酯素(17),β-棕榈精(18)和豆甾醇(19)。除了化合物8和9外,其他化合物均为首次从该植物中分离得到。     

米邦塔仙人掌化学成分研究

从米邦塔仙人掌正丁醇部分分离到10个化合物。应用色谱和光谱分析方法分别鉴定为对羟基苯甲酸(1)、β-羟基-3-甲氧基-4-羟基苯乙酮(2)、2,3,4-三羟基戊酸(3)、4-甲氧基桂皮酸(4)、3-羟基-4-甲氧基肉桂酸(5)、5-羟基阿魏酸(6)、4-羟基肉桂酸(7)、原儿茶酸(8)、n-butyl eucomate(9)和eucomic acid(10)。化合物2～10为首次从该植物分离得到。     

珍珠荚蒾的化学成分研究

从珍珠荚蒾(Viburnum foetidum var.ceanothoides)的枝叶中分离得到14个化合物,经鉴定分别为:白桦醇(1),熊果醇(2),β-谷甾醇(3),白桦脂酸(4),熊果酸(5),对羟基苯甲酸(6),4,4′-二羟基-a-古柯间二酸(7),反式对香豆酸(8),顺式对香豆酸(9),红花菜豆酸(10),原儿茶酸(11),胡萝卜苷(12),1-O-(6-O-α-L-rhamnopyranosyl-β-D-glucopyranosyl) -4-allylbenzene(13)和apigenin 7-O-α-L-rhamnopyranosyl(1″ ′→2″)-β-D-glucopyranoside (14).其中,化合物1、7、9、10和13为首次从荚蓬属中分离得到;所有化合物均首次从珍珠荚蓬中分离得到.     

陕西荚蒾叶化学成分的研究

采用色谱技术对陕西荚蒾叶的化学成分进行研究,并通过NMR、IR、MS等波谱法鉴定化合物的结构。结果从中分离得到8个单体化合物,经鉴定为:对羟基桂皮酸(1)、7-羟基-6-甲氧基香豆素(2)、β-香树脂酮(3)、7-羟基香豆素(4)、香草酸(5)、β-胡萝卜苷(6)、3β,20-二羟基-5β-孕甾烷(7)和β-谷甾醇(8)。以上所有化合物均为首次从陕西荚蒾中分离得到。     

云南枸杞根中酰胺类化学成分及其抗炎活性研究北大核心CSCD

研究云南枸杞(Lycium yunnanense Kuang)根部的酰胺类化学成分。通过硅胶和Sephadex LH-20柱层析,以及高效液相制备层析等分离纯化手段,从云南枸杞根部醇提物中共分离得到15个酰胺类化合物,运用现代波谱技术鉴定了它们的结构,分别为反式-N-阿魏酰酪胺(1)、N-顺式-对羟基苯乙基阿魏酰胺(2)、dihydro-feruloyltyramine(3)、3-(4-hydroxy-3-methoxyphenyl)-N-[2-(4-hydroxyphenyl)-2-methoxyethyl]acrylamide(4)、N-反式桂皮酸酰对羟基苯乙胺(5)、反式-N-对羟基香豆酰酪胺(6)、反式-N-对羟基苯乙基咖啡酰胺(7)、二氢咖啡酰酪胺(8)、N-trans-coumaroyloctopamine(9)、N-[2-(3,4-dih-ydroxyphenyl)-2-hydroxyethyl]-3-(4-methoxyphenyl)prop-2-enamide(10)、N-trans-feruloyl-3'-O-methyldopamine(11)、dihydro-feruloyl-5-methoxytyramine(12)、N-trans-sinapoyltyramine(13)、N-acetyl-N'-trans-feruloylputrescine(14)、N-acetyltyramine(15)。其中,化合物3~5,9~15为首次从该植物中分离得到。对分离得到的15个酰胺类化合物进行抗炎活性筛选,其中,化合物4、6、7和12具有显著的抗炎活性,其IC50值均小于17.21±0.50μM。     

云南枸杞根中酰胺类化学成分及其抗炎活性研究

研究云南枸杞(Lycium yunnanense Kuang)根部的酰胺类化学成分。通过硅胶和Sephadex LH-20柱层析,以及高效液相制备层析等分离纯化手段,从云南枸杞根部醇提物中共分离得到15个酰胺类化合物,运用现代波谱技术鉴定了它们的结构,分别为反式-N-阿魏酰酪胺(1)、N-顺式-对羟基苯乙基阿魏酰胺(2)、dihydro-feruloyltyramine(3)、3-(4-hydroxy-3-methoxyphenyl)-N-[2-(4-hydroxyphenyl)-2-methoxyethyl]acrylamide(4)、N-反式桂皮酸酰对羟基苯乙胺(5)、反式-N-对羟基香豆酰酪胺(6)、反式-N-对羟基苯乙基咖啡酰胺(7)、二氢咖啡酰酪胺(8)、N-trans-coumaroyloctopamine(9)、N-[2-(3,4-dih-ydroxyphenyl)-2-hydroxyethyl]-3-(4-methoxyphenyl)prop-2-enamide(10)、N-trans-feruloyl-3'-O-methyldopamine(11)、dihydro-feruloyl-5-methoxytyramine(12)、N-trans-sinapoyltyramine(13)、N-acetyl-N'-trans-feruloylputrescine(14)、N-acetyltyramine(15)。其中,化合物3~5,9~15为首次从该植物中分离得到。对分离得到的15个酰胺类化合物进行抗炎活性筛选,其中,化合物4、6、7和12具有显著的抗炎活性,其IC50值均小于17.21±0.50μM。     

棉毛橐吾根茎中化学成分研究

采用硅胶、Sephadex LH-20凝胶、Toyopearl HW-40凝胶及Diaion HP-20树脂等色谱方法从云南丽江棉毛橐吾中分离得到化合物18个,通过理化手段及波谱技术分别鉴定为:呋喃艾里莫芬-14β,6α-内酯(1)、β-谷甾醇(2)、惕格酸(3)、棕榈酸(4)、十九烷酸甲酯(5)、艾里莫芬-7(11)-烯-12,8α(14β,6α)-二内酯(6)、8β-甲氧基艾里莫芬-7(11)-烯-12,8α(14β,6α)-二内酯(7)、1-O-十六烷酰基甘油酯(8)、8β-羟基艾里莫芬-7(11)-烯-12,8α(14β,6α)-二内酯(9)、对羟基桂皮酸甲酯(10)、对羟基苯乙酮(11)、伞形花内酯(12)、3,4-二羟基苯乙酮(13)、胡萝卜苷(14)、1,5-二咖啡酰奎宁酸(15)、对羟基桂皮酸(16)、咖啡酸(17)及七叶内酯(18),其中化合物4~5,8,10,13,15及17,18为首次从该植物中分离得到。     

鸦胆子果实的化学成分研究

为了解鸦胆子(Brucea javanica)的化学成分,从鸦胆子果实中分离得到13个已知化合物,经波谱学分析鉴定为：对羟基苯甲醛(1),对羟基苯甲酸(2),3,4-二羟基苯甲酸(3),3,4-二羟基苯甲酸甲酯(4),没食子酸(5),丁香酸(6),二氢阿魏酸(7),毛地黄黄酮(8),angophorol (9),2β,6β,9β-trihydroxyclovane (10),硬脂酸(11),β-谷甾醇(12)和β-胡萝卜苷(13)。化合物2,4,6~10均系从鸦胆子果实中首次分离得到。     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

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     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

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.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

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.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

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.     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细