利用2D-NMR确定楤木皂甙的结构

本文利用2D-NMR(~1H-~1H CosY,~(13)C-~1H CosY,2D-NOE)确定了楤木皂甙S_2中糖的种类及其连接顺序。     

海黄瓜中的六种抗真菌低聚糖甙的结构

从海黄瓜[Stichopus chloronotus (Brsndt))中分离六种抗真菌的三萜——低聚糖甙:Stichlorosides A_1,A_2,B_1,B_2,C_1和C_2,并确定其甙元(stichlorogenol和dehydrostichlorogenol)的结     

丝瓜叶中丝瓜皂甙R的化学结构

从丝瓜(Lufa cylindrica Roem.)叶中分得一种新的五环三萜皂甙和丝瓜皂甙G,用光谱和化学方法确定新皂甙的结构为2α,21β-二羟基常春藤皂甙元-3-O-β-D-吡喃葡萄糖甙,命名为丝瓜皂甙R。     

丝瓜叶化学成分的研究

从丝瓜(Luffa cylindrica Roem.)叶中分得一种新的五环三萜皂甙和芹菜素,用光谱和化学方法确定该皂甙的结构为21β-羟基齐墩果酸-28-O-β-D-吡喃葡萄糖甙,命名为丝瓜皂甙Q。     

刺五加中皂甙新成分:刺五加甙A_1,A_2,A_3,D_3和A_4的结构

前报(Chem Pharm Bull 1989,36(2):601)已报道了从刺五加(Acanthopanaxsenticosus)叶中分得的8种新皂甙的结构鉴定,即刺五加甙(Ciwujianosides)B,C_1,C_2,D_2,E,C_3,C_4,和D_1。作者又从刺五加叶中分得5种新皂甙,即刺五加甙A_1,A_2,A_3,D_3和A_4。本文主要报道这些新皂甙的结构鉴定。刺五加干燥叶的甲醇提取物如前报所述进行正相和反相层析,最后经HPLC,得到5种皂甙。     

西洋参叶和茎中达玛烷型皂甙的深入研究

西洋参(Panax quinquefolium L)的茎和叶中含达玛烷型皂甙:人参皂甙A_1,A_2,B_1,B_2和C,后4种即是人参中的人参皂甙Rg_1,Rd,Re与Rb_2。皂甙A_1则尚未从人参根和叶分离得到过。本文报道皂甙A_1的鉴定以及对皂甙C重新鉴定的结果。作者通过对皂甙酸水解后糖的鉴定以及以物理常数、TLC、MS和~(13)CNMR与标准品比较,证明皂甙A_1即为喜马拉雅三七(P·pseudo-ginseng subsp.himalaicus Hara)叶中的伪-人参皂甙F_(11)。曾有报道,将皂甙C鉴定为皂甙Rb_2。作者通过用~(13)CNMR进行研究,认为皂甙C不是Rb_2而应该是Rb_3。过去的结论仅是由物理常数、薄层及质谱分析数据得出,因为Rb_2与Rb_3薄层层析Rf值及质谱数据完全相符合,而只有用~(13)CNMR才显示出二者的差别。     

苦楝子中三萜成分的研究

目的:对苦楝子的甲醇提取物中的三萜成分进行研究.方法:利用硅胶,常压RP-C18硅胶,葡聚糖凝胶 LH-20以及制备液相色谱分离纯化,通过1D-NMR,2D-NMR以及EI-MS波谱数据鉴定化合物结构.结果:从苦楝子的甲醇提取物中共分离得到4个三萜化合物经鉴定为:Meliasenin B (Ⅰ),Meliasenin ...     

美洲人参的皂甙及其甙元的分析

本文讨论了用气液相层析法可以正确地分析出兔血浆和尿样品中的人参皂甙A_1(三七皂甙F_(11))、A_2(Rg_1)、B_2(Re)、C(Rb_2)和皂甙元及人参萜二醇、人参萜三醇。材料:美洲人参(Panax quinquefoli-um L.,五加科)的茎、叶中提取分离的人参皂甙A_1、A_2、B_2、C和人参黄酮甙;人参皂甙的水解产物经柱层析纯化精制得到的人参萜二醇、人参萜三醇;豆甾醇(内标物)和吡啶,三甲硅烷基TBT。     

合欢皮中新皂甙的结构鉴定

从合欢皮(Albizziae cortex)的95%乙醇提取物的正丁醇萃取部分中分离得到3个新的三萜皂甙,用化学方法及¹H-和¹³C-NMR,DEPT,COSY,TOCSY,HMQC-COSY,HMQC-TOCSY,HMBC,NOESY等波谱方法鉴定其结构为:I(1个三萜,9个糖,2个单萜),命名为合欢皂甙(julibroside)J₁;II(1个三萜,8个糖,2个单萜),命名为合欢皂甙J_{2;II(1个三萜,9个糖,2个单萜),命名为合欢皂甙J3。}     

氧杂蒽酮抗生素A3—118D

从一株编号为SIPI-A_3-118的放线菌菌株的发酵培养液中分离到一个呈黄色结晶状的抗生素—A_3-118D。经HR—MS,1D—NMR及2D-NMR研究,抗生素A_3-118D与氧杂蒽酮抗生素Lysolipin Ⅰ结构相同。     

滇黄芩中滇黄芩新素的结构研究

前已报道自四川产滇黄芩Scutellaria,amoena C.H.Wright中分离出五种黄酮成分和从云南产的中得到另八个黄酮类化合物。本文继续报道从云南产滇黄芩中得到的六个化合物和从四川产本种植物中得到一个黄酮化合物的结构鉴定。     

滇黄芩中新黄酮成分的结构研究

从唇形科植物滇黄芩Scutellaria amoena C.H.Wright的根中分得八种黄酮类成分(Ⅰ～Ⅷ)。经理化常数测定、光谱分析和化学反应证明,Ⅰ和Ⅱ为新化合物,其结构分别为(2S)-2′,5,6′-三羟基-7-甲氧基双氢黄酮-2′-O-β-D-葡萄吡喃糖甙(Ⅰ)和(2 R,3 R)-2′,3,5,7-四羟基双氢黄酮(Ⅱ);其余六种为已知化合物,分别鉴定为(2S)-5,7,8-三羟基双氢黄酮(Ⅲ)、(2S)-2′,5,6′,7-四羟基双氢黄酮(Ⅳ)、(2 R,3 R)-2′,3,5,6′,7-五羟基双氢黄酮(Ⅴ)、2′,5,6′,7-四羟基黄酮(Ⅵ)、去甲汉黄芩素(Ⅶ)和千层纸甲素(Ⅷ),此六种化合物均为首次从该植物中得到。     

THE EFFECT OF β-ADRENOCEPTOR BLOCKERS ON THE ABSORPTION AND EXCRETION OF CHLOROTHIAZIDE IN MAN

The effect of beta-adrenoceptor blockers on the absorption and elimination of the diuretic chlorothiazide was studied in healthy subjects. A week of pretreatment with either pindolol (10 mg twice daily) or propranolol (80 mg twice daily) resulted in significant reduction in 36 h mean cumulative urinary recovery of chlorothiazide in two groups of six subjects compared with a control (untreated) group. A week of pretreatment with atenolol (100 mg daily) did not significantly alter 36 h cumulative urinary excretion in another group of six subjects. None of the beta-blockers significantly changed chlorothiazide half-life. It is suggested that the non-selective (as opposed to the cardioselective) beta-blockers reduce chlorothiazide absorption by the mechanism(s) discussed.     

THE INFLUENCE OF β-ADRENOCEPTOR ANTAGONISTS ON ACCOMMODATION OF THE LENS

1. A study of the influence of single oral doses of the adrenergic β-receptor antagonists alprenolol (100 mg) and propranolol (50 mg) on the accommodation of the lens was made in six healthy male subjects. 2. There was no significant influence of either drug on lens accommodation.     

氧青霉烷类抗生素的合成研究

氧青霉烷类抗生素是近年来新发现的一类新抗生素,它具有抗细菌、抗真菌、抗肿瘤及抑制β-内酰胺酶的作用,引起人们很大的关注。 由1,2,4-丁三醇出发,用异丙叉基将相邻的二羟基保护,使4-羟基苯甲酰化,水解去掉异丙叉基后,将1-羟基选择性地对甲苯磺酰化,每经叠氮基转变成氨基,生成的化合物与醋酸缩合,得二氧唑的化合物,最后与氯乙酰氯缩合,形成β-内酰胺环,制得目的化合物,产物和中间体的结构经IR、~1H-NMR、C~(13)-NMR及MS等确证无疑。     

抗瘤酮类似物的抗肿瘤活性

本文报道15个抗瘤酮A_(10)衍生物对临床分离的六株肿瘤的抑制活性测定结果,比较了它们同临床常用抗癌药物对临床分离的食道癌89111的抑制活性,并对比测定了化合物4、7和9同抗瘤酮A_1。对小鼠S_(160)瘤株的抑制活性。     

沙苑子有效成分的研究

沙苑子(Astragalus complanatus R.Br.)甲醇提出物的石油醚溶出部位显示较强降转氨酶活性,从此部位分得6个单体,经理化常数测定和光谱解析证明为:鼠李柠檬素(I),芒柄花素(II),豆甾醇(IV),磷脂酰乙醇胺(V),磷脂酰肌醇(VI)和新化合物11-O-p-coumarylnepeticin(II),以上化合物均为首次从该植物中得到。     

EFFECT OF PERINDOPRIL ON THE DEVELOPMENT OF ATHEROSCLEROSIS IN THE CHOLESTEROL-FED RABBIT

1. The aim of the study was to examine the effect of the angiotensin-converting enzyme inhibitor perindopril on the development of atheroma in the cholesterol-fed rabbit.
2. The normal human carotid artery, like most large human arteries, has a preformed diffuse intimal thickening. To model this thickening, the right carotid artery of the 12-week-old rabbit had an expanded balloon catheter passed down it to remove the endothelium and partially damage the media.
3. Fourteen weeks after this operation, a myointimal thickening similar in almost all respects to the human intimal thickening had developed. The rabbits were then divided into six groups of six rabbits fed on: (i) a 1% cholesterol diet; (ii) a 1% cholesterol diet plus a hypotensive dose of perindopril (0.3 mg/kg per day); (iii) a 1% cholesterol diet plus a non-hypotensive dose of perindopril (0.01 mg/kg per day); (iv) a normal diet; (v) a normal diet plus a hypotensive dose of perindopril (0.3 mg/kg per day); and (vi) a normal diet plus a non-hypotensive dose of perindopril (0.01 mg/kg per day).
4. After 6 weeks of treatment the animals were sacrificed. There were ameliorating effects of both hypotensive and non-hypotensive doses of perindopril on the development of plaques, as determined by the area of intima covered by Oil Red-O-staining plaque and light microscopy.
5. Cell culture studies indicated that perindopril has no effect on smooth muscle proliferation, but increases collagen and non-collagen synthesis by smooth muscle cells and decreases their binding of the atherogenic lipoprotein beta-very low density lipoprotein (β-VLDL).
6. The results suggest that perindopril has a beneficial effect in decreasing the severity of atherosclerotic lesions in the cholesterol-fed rabbit, possibly by affecting lipoprotein metabolism.     

F30066对家兔肝肾功能的影响

F30066, N-(isopropyl)-β-(5-nitro-2-furyl)-acrylamide, is a new oral drug for Schis- tosomiasis japonica. The present work studied the effect of F30066 on the liver and kidney functions of uninfected and infected rabbits six weeks after the cercarial infection of Schistosoma japonicum. The experimental results indicate that the drug causes some damages to the liver and the kidney, but the damages are reversible. The authors also observed the normal-value distributions of several useful tests for liver and kidney func- tions in about 200 animal-times of rabbits.     

六种甘草属植物根中黄酮类成分的高效液相色谱分析

应用反相高效液相色谱技术,对从甘草中提取的10个黄酮类化合物进行了分离,并且分析了6种甘草属植物根的9个样品的黄酮类化合物的组成,结果表明,不同种的甘草中所含黄酮类化合物的成分、含量均不同。