Sesquiterpene Lactone Glycosides from Carpesium macrocephalum

Two new sesquiterpene lactone glycosides were isolated from the seeds of Carpesium meacrocephalum. Their structures were elucidated as 2α-O-β-D-glucopyranosy-5α,11αH-eudesma-4(15)-en-12,8β-olide and 2α-O-β-D-glucopyranosy-5αH-eudesma-4(15),11(13)-dien-12,8β-olide by spectral methods (HRMS,1D and 2D NMR).     

植物来源抗疟倍半萜类天然产物研究(1972～2022)

植物是筛选活性天然产物的重要来源, 1972年至2022年来从植物中分离得到了237个具有抗疟活性的倍半萜类化合物,其类型主要包括链型倍半萜、吉玛烷型倍半萜、桉叶烷型倍半萜、乌药烷型倍半萜和愈创木烷型倍半萜等.综述了植物来源的抗疟倍半萜类天然产物研究进展,以期为后续研究开发新型抗疟药物提供参考.     

小花玄参化学成分的定性研究及总黄酮含量的测定

采用不同极性溶剂提取小花玄参中的化学成分,应用植物化学成分的系统分析法定性研究,并对其总黄酮含量进行测定.结果表明,小花玄参中含有氨基酸、多肽和蛋白质、糖及苷类、有机酸、鞣质、皂苷、甾体或三萜类、黄酮、酚类、挥发油和油脂、强心苷和生物碱等化学成分,未检出蒽醌及香豆素与萜类内酯;小花玄参中总黄酮的含量为5.689%(56.89mg/g).该结果可为小花玄参化学成分的分离纯化、药理研究以及开发利用等提供基础依据.     

应用GC/FTIR鉴定一些单萜类化合物的研究

本文介绍毛细管GC/IR方法鉴定a-蒎烯在固体酸Nafion H催化下酯化及重排异构化的产物. 讨论了GC/IR方法定性的可靠性及存在的问题, 并对GC/IR实验方法, 作了较为详细的研究, 其中包括不同口经毛细管色谱柱与光管匹配问题和影响红外检测灵敏度的多种因素.     

南蛇藤昆虫拒食成分的研究(I)

南蛇藤昆虫拒食成分的研究（Ｉ）王明安,陈馥衡（北京农业大学应用化学系,北京,１０００９４）关键词南蛇藤,倍半萜,结构分析南蛇藤（Ｃｅｌａｓｔｒｕｓｏｒｂｉｃｕｌａｔｕｓ）是我国传统的低毒杀虫植物,其主要化学成分为倍半萜［１］．Ｓｍｉｔｈ等［２,３］对...     

南蛇藤昆虫拒食倍半萜成分的研究(Ⅱ)

南蛇藤昆虫拒食倍半萜成分的研究（Ⅱ）王明安,陈馥衡（北京农业大学应用化学系,北京,１０００９４）关键词南蛇藤,倍半萜,结构分析卫矛科植物含多种类型β－二氢沉香呋喃倍半萜多醇酯衍生物和生物碱［１］,有些化合物显示了良好的昆虫拒食和抗肿瘤活性［２～４］．...     

南蛇藤倍半萜成分研究

从南蛇藤(Celastrus gemmatus)的根皮中分得两个新的倍半萜化合物(1和2), 经高场核磁和高分辨质谱分析, 推定1为1β, 6α, 8β-三乙酰氧基-2β, 12-二异丁酰氧基-9α-(β-呋喃甲酰氧基)-4α-羟基-β-二氢沉各呋喃, 2为1β, 8α-二乙酰氧基-2β,12-二异丁酰氧基-9β-苯甲酰氧基-4α, 6α-二羟基β-二氢沉香呋喃。     

GC-MS分析大叶金花草中挥发性成分和脂肪酸

应用 GC-MS 联用技术对大叶金花草(Stenoloma chusana(L.)Ching)的挥发性成分和脂肪酸进行了检测,共检测出7种挥发性成分和32种脂肪酸,脂肪酸检出量为87.65%,其中饱和脂肪酸占脂肪酸总量的53.13%,不饱和脂肪酸占脂肪酸总量的46.87%.该研究为大叶金花草的进一步开发利用提供了科学依据.     

火试金法测定含Pd金合金首饰中金含量的研究

本文研究了应用火试金法测定含Pd金合金首饰中的金含量时,降低称样量、灰皿的种类、标金中适量铜的加入及银的加入量对于样品金含量分析结果的影响。结果表明:称样量降低到160~200 mg不影响检测结果;采用镁砂灰皿和骨灰灰皿的结果与样品理论金含量的偏差均在标准的允差范围内;标准金中加入适量的铜后,测得的金含量更接近配制样品的理论金含量;标准金中银的加入量(2.5倍~2.7倍金的质量)对于金含量的的分析结果影响不大。应用本文的方法,本中心参加了欧洲分析协会(AEAO)组织的国际比对实验(AEAORound Robin 2006),我中心检验结果的Z值为-1.16,在可接受范围内。通过这次比对实验,不仅验证了本文所述的实验方法,同时也证明我中心具备了与国际贵金属分析实验室相同的检测能力。     

Studies on the constituents from the aerial part of Baccharis dracunculifolia DC.

Ten new glycosides, named dracunculifosides A-J, were isolated along with sixteen known glycosides from the aerial part of Baccharis dracunculifolia DC. (Compositae). The structures of these glycosides were determined on the basis of spectral and chemical evidence. These new glycosides consisted of beta-D-glucopyranose or beta-D-apiofuranosyl-(1-->6)-beta-D-glucopyranose, and most possess an (E)-caffeoyl group.     

Studies on the constituents from the aerial part of Baccharis dracunculifolia DC. II

Ten new glycosides were obtained along with five known compounds from the aerial part of Baccharis dracunculifolia DC. (Compositae). The structures of these glycosides were determined based on spectral and chemical evidence. These new compounds consisted of beta-D-glucopyranose or beta-D-apiofuranosyl-(1-->6)-beta-D-glucopyranose, and most possessed an (E)-caffeoyl group the same as dracunculifosides A-J.     

Studies on the constituents of Clematis species. VIII. Triterpenoid saponins from the aerial part of Clematis tibetana KUNTZ

From the aerial part of Clematis tibetana, two new hederagenin 3,28-O-bisdesmosides called clematibetosides A and C, and a new gypsogenin 3,28-O-bisdesmoside called clematibetoside B, have been isolated together with ten known saponins. The structures of the new saponins have been elucidated based on chemical and spectral evidence as follows: clematibetoside A, 3-O-(2-O-caffeoyl)-beta-D-glucopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->4)-beta-D-ribopyranosyl-(1-->3)-alpha-L-rhamnopyranosyl-(1-->2)-alpha-L-arabinopyranosyl hederagenin 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->6)-beta-D-glucopyraside; clematibetoside B, 3-O-alpha-L-rhamnopyranosyl-(1-->2)-alpha-L-arabinopyranosyl gypsogenin 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->6)-beta-D-glucopyranoside; clematibetoside C, 3-O-beta-D-ribopyranosyl hederagenin 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->6)-beta-D-glucopyranoside.     

Water-soluble phenylpropanoid constituents from aerial roots of Ficus microcarpa

New water-soluble phenylpropanoid constituents, ficuscarpanoside A, guaiacylglycerol 9-O-beta-D-glucopyranoside, and erythro-guaiacylglycerol 9-O-beta-D-glucopyranoside, along with known guaiacylglycerol, erythro-guaiacylglycerol, 4-methoxy guaiacylglycerol 7-O-beta-D-glucopyranoside, and 3-(4-hydroxy-3-methoxy phenyl) propan-1,2-diol, have been isolated from the aerial roots of Ficus microcarpa. Their structures were elucidated on the basis of 1D and 2D NMR experiments.     

Steroidal glycosides from the aerial part of Asclepias incarnata L. II

Thirty new steroidal glycosides were obtained from the aerial part of Asclepias incarnata L. (Asclepiadaceae). These glycosides were confirmed to have lineolon, isolineolon, 12-O-acetyllineolon, 12-O-(Z)-cinnamoyllineolon, metaplexigenin, 15 beta-hydroxylineolon, 15 beta-hydroxyisolineolon, 16 alpha-hydroxyisolineolon, 12-O-tigloyl-16 alpha-hydroxyisolineolon as the aglycone and 2,6-dideoxyhexopyranose as the sugar sequence by spectroscopic methods and chemical evidence.