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1.
沙枣(Elaeagnus angustifolia)也叫银柳、香柳、桂香柳,与沙棘同属胡颓子科,常绿灌木,主产于西北地区,分布在新疆、甘肃、青海、内蒙古西部等与沙漠接壤的典型大漠干旱或戈壁滩上.其树皮、果实和花均可用于治疗风寒咳嗽、痢疾腹泻等疾病(江苏新医学院中药大辞典编写组,1977). 相似文献
2.
研究了杜仲内树皮及其抽提物的一般物、矿物质、脂肪酸与单糖的化学组成.结果表明,碳水化合物(92.97%)、钙(5.1769mg/g)、α - 亚麻酸(27.4%)及葡萄糖(130.51mg/g)分别是杜仲内树皮的一般物、矿物质、脂肪酸与单糖的主要组成成分.采用Sephadex LH - 20柱色谱及薄层色谱等方法,从其70%丙酮提取物水溶性部分分到5种化合物,经波谱分析及理化性质化合物分别鉴定为:紫云英苷(1)、异槲皮苷(2)、槲皮素 - 3 - O - 木糖葡萄糖苷(3)、异绿原酸 A(4)、异绿原酸 C(5).化合物3～5为首次从该植物中分得. 相似文献
3.
Two new compounds, 4-ethoxycarbonyloxy-3,3',4'-trimethoxy-ellagic acid (1) and 4-E-propenyl-phenol-1-O-beta-D-rutinoside (2), together with four known compounds, 3,3',4'-trimethoxy-ellagic acid (3), 3,3'-dimethoxy-ellagic acid (4), 3,3',4'-trimethoxy-ellagic acid-4-O-beta-D-glucopyranoside (5) and 3'-methoxy-ellagic acid-4-O-alpha-L-rhamnopyranoside (6), were isolated from the whole plant of Cleidion brevipetiolatum. Their structures were elucidated from spectral evidences. 相似文献
4.
Eudesmane derivatives from Laggera pterodonta 总被引：4，自引：0，他引：4
A new eudesmane derivative, 4alpha,5alpha-dihydroxyeudesma-11(13)-en-12-oic acid, was isolated from Laggera pterodonta. Its structure was elucidated as (1) on the basis of spectroscopic evidence. Moreover, six known compounds were isolated: pterodontriol A (2), pterodontriol B, pterodonta acid (3), ilicic acid (4), costic acid and beta-amyrin. Cytotoxic activity of compounds 2, 3 and 4 was investigated. 相似文献
5.
Four diterpenes were isolated from the stem bark of Mitrephora celebica through bioassay-guided fractionation. Ent-trachyloban-19-oic acid (1) and ent-kaur-16-en-19-oic acid (2) were identified as the compounds responsible for the antimicrobial activity of the plant against methicillin-resistant Staphylococcus aureus and Mycobacterium smegmatis. 8(14),15-pimaradien-18-oic acid (3) and 7,15-pimaradien-18-oic acid (4) were isolated from the same fraction and were inactive against the microorganisms. 相似文献
6.
Yan-Zhi Li Zhan-Lin Li Shi-Liang Yin Guang Shi Ming-Sheng Liu Yong-Kui Jing Hui-Ming Hua 《Fitoterapia》2010
A new friedelane-type triterpene (1), along with seven known triterpenoids, was isolated from the stems and leaves of Calophyllum inophyllum Linn. Their structures were established as 3β, 23-epoxy-friedelan-28-oic acid (1), friedelin (2), epifriedelanol (3), canophyllal (4), canophyllol (5), canophyllic acid (6), 3-oxo-friedelan-28-oic acid (7), and oleanolic acid (8) by spectroscopic methods (NMR, EI-MS). The growth inhibitory effects of these triterpenoids on human leukemia HL-60 cells were determined. 相似文献
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8.
Shingo Kawai Kyousuke Nakata Hiroo Ichizawa Tomoaki Nishida 《Journal of Wood Science》2010,56(2):148-153
There is little evidence concerning the biosynthetic pathways for cyclic diarylheptanoids. We previously demonstrated that
the cyclic diarylheptanoids myricanol and myricanone were biologically synthesized from two molecules of 4-coumaric acid by
the feeding of 4-[8,9-13C2]coumaric acid to young shoots of Myrica rubra. In the present study, using a 13C-labeled compound, we revealed that two molecules of 3-(4-hydroxyphenyl)propionic acid could also be a biosynthetic precursor
of myricanol in M. rubra. These results indicated that both 4-coumaric acid and its dihydro-derivative were incorporated into myricanol. Competitive
feeding experiments with 4-[8,9-13C2]coumaric acid and 3-(4-hydroxyphenyl)-[1-13C]propionic acid were performed in M. rubra to determine the preferential incorporation of these two precursors. 13C-NMR studies indicated that 3-(4-hydroxyphenyl)-[1-13C]propionic acid was preferentially incorporated into myricanol. The data provided evidence for a biosynthetic sequence originating
from 4-coumaric acid and leading to myricanol, through 3-(4-hydroxyphenyl)propionic acid, in M. rubra. 相似文献
9.
A new chlorinated flavonoid, 3, 6, 8-trichloro-5, 7, 3', 4'-tetrahydroxyflavone (1), a new biscoumaric acid derivative, 4-O-(2″, 3″-O-diacetyl-6″-O-p-coumaroyl-β-d-glucopyranosyl)-p-coumaric acid (2), and 8, 3', 4'-trihydroxyflavone-7-O-β-d-glucopyranoside (3) together with twenty-four known compounds (4-27) were isolated from the whole plant of Bidens bipinnata. All chemical structures were established on the basis of UV-, MS- and NMR ((1)H, (13)C, (1)H-(1)H COSY, HMQC and HMBC) spectroscopic data. Some of the isolated compounds were tested for the inhibition of α-amylase. The result showed that isookanin (6) was a potent inhibitor of α-amylase (IC(50)=0.447mg/ml). 相似文献
10.
Anti-Helicobacter pylori metabolites from Rhizoctonia sp. Cy064, an endophytic fungus in Cynodon dactylon 总被引：1，自引：0，他引：1
A new benzophenone, named rhizoctonic acid (1), together with three known compounds monomethylsulochrin (2), ergosterol (3) and 3beta,5alpha,6beta-trihydroxyergosta-7,22-diene (4) were isolated through bioassay-guided fractionations from the culture of Rhizoctonia sp. (Cy064), an endophytic fungus in the leaf of Cynodon dactylon. The structure of the new acid 1 was elucidated to be 5-hydroxy-2-(2-hydroxy-6-methoxy-4-methylbenzoyl)-3-methoxybenzoic acid by a combination of spectral analyses. Furthermore, the structure of monomethylsulochrin 2 was confirmed by 13C-NMR analysis. All four metabolites were subjected to a more detailed in vitro assessment of their antibacterial action against five clinically isolated and one reference (ATCC 43504) Helicobacter pylori strains. 相似文献
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研究了在室温下,离子液体[Hmim][CF_3SO_3]溶解木质素及其模型化合物后,与酶液在小分子有机酸作用下形成的三元液相平衡体系,及在此体系中进行酶促反应的过程。结果表明:小分子有机酸使水-离子液体形成的两相转化为均相的主要贡献是由羧基提供的,[Hmim][CF_3SO_3]在溶解木质素后依旧保留与有机酸和水形成三元相平衡体系的能力;以酶液作为水相,以溶解了木质素的离子液体作为疏水相,甲酸的掺入在起到平衡水相和疏水相的同时也作为木质素降解酶反应过程中的自由基稳定剂;在三元液相体系的反应中,离子液体引起酶的部分失活;随着反应的进行,碱木质素和木质素脱氢聚合物(DHPs)的降解率分别为56.5%和66.5%,甲氧基分别降低了46.7%和45.3%,生成的酚类化合物分别为204.7和207.0 mg/L,甲酸分别消耗了0.57和0.76 g。DHPs在降解过程中,由于甲酸的过度消耗导致了平衡体系的解体。 相似文献
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14.
A new diterpenoid ester, fritillahupehin (1) together with three known fatty acids: palmitic acid (2), lignoceric acid (3) and azelaic acid (4) were isolated from the bulbs of Fritillaria hupehensis Hsiao and K.C. Hsia. The structure of fritillahupehin has been established to be ent-kauran-16beta-yl lignocerate by means of spectroscopic and chemical evidence. Compounds 2-4 were isolated from Fritillaria sp. for the first time. 相似文献
15.
研究松香的主要成分枞酸在磷钨酸季铵盐[π-C5H5N(CH2)15CH3]3PW12O40/H2O2催化反应体系中的氧化反应,考察催化剂用量、H2O2用量和反应温度对枞酸氧化转化率的影响,并通过紫外光谱、红外光谱以及气质联用谱对氧化产物进行结构表征。结果表明,在温和条件下,磷钨酸季铵盐能较好地催化过氧化氢对枞酸的氧化反应,枞酸的共轭双键已被破坏,枞酸氧化产物主要为脱氢枞酸、7-羟基-脱氢枞酸和7-羰基-脱氢枞酸;在本实验最佳的反应条件(枞酸5 mmol,催化剂0.084 g,30%H2O20.9 mL,温度30℃,反应时间5 h)下,枞酸的氧化转化率大于95%。 相似文献
16.
An investigation of the aliphatic nitrocompounds in Indigofera kirilowii resulted in the identification of two new esters of glucose with 3-nitropropanoic acid and acrylic acid - kirilowin C (1) and kirilowin D (2), together with four new glucose 3-nitropropanoates - kirilowins E-H (3-6). Their structures were identified by spectroscopic data. 相似文献
17.
Phytochemical investigation of the leaves of Aralia elata has led to the isolation of four new compounds, 3-O-β-D-glucopyranosyl (1→3)-β-D-glucopyranosyl (1→3)-β-D-glucopyranosyl oleanolic acid (1), 3-O-[β-D-glucopyranosyl (1→3)-β-D-glucopyranosyl (1→3)]-[β-D-glucopyranosyl (1→2)]-β-d-glucopyranosyl hederagenin 28-O-β-D-glucopyranoside (2), 3-O-{[β-D-glucopyranosyl (1→2)]-[β-d-glucopyranosyl (1→3)-β-d-glucopyranosyl (1→3)]-β-D-glucopyranosyl} oleanolic acid 28-O-β-D-glucopyranosyl ester (3) and 3-O-[β-D-glucopyranosyl (1→2)]-[β-D-glucopyranosyl (1→3)]-β-d-glucopyranosyl caulophyllogenin (4) and two known compounds, 3-O-[β-D-glucopyranosyl (1→3)-α-l-arabinopyranosyl]-echinocystic acid (5) and 3-O-α-L-arabinopyranosyl echinocystic acid (6). The structural determination was accomplished with spectroscopic analysis, in particular (13)C-NMR, 2D-NMR and HR-ESI-MS techniques. Compounds 1-6 were tested for their inhibition of the growth of HL60, A549 and DU145 cancer cells. Compound 1 showed significant cytotoxic activity against HL60 and A549 cancer cells with IC(50) values of 6.99μM and 7.93μM respectively. In addition, compounds 5 and 6 showed significant cytotoxic activity against HL60 cancer cells with IC(50) values of 5.75μM and 7.51μM, respectively. 相似文献
18.
以慈竹为材料,通过喷洒不同浓度和比例的赤霉素(GA3)和吲哚乙酸(IAA),研究慈竹茎部木质素动态积累规律以及GA3和IAA对慈竹茎部木质素S/G比例的调控效应。结果表明,GA3和IAA组合处理对慈竹茎杆木质素含量动态积累的调控效应不同:50 mg.L-1GA3+200 mg.L-1IAA(GA350IAA200)组合处理和对照(清水处理)的慈竹的木质素含量动态积累趋势基本一致,二者都在处理10 d和30 d时出现2个高峰;GA350IAA200处理具有降低木质素含量的作用;而200 mg.L-1GA3+50 mg.L-1IAA(GA3200IAA50)组合处理改变了慈竹木质素含量动态积累趋势,具有增加慈竹木质素含量的作用。GA3和IAA组合处理改变了慈竹茎部S/G比值的变化趋势,具有降低S/G比值的作用;GA3和IAA组合处理对慈竹茎部木质素和S/G比值的调控作用因GA3和IAA浓度和配比不同而不同。 相似文献
19.
Rooting was induced in in-vitro-propagated walnut (Juglans regia L.) shoots by subculturing the shoots on rooting medium containing agar and 3 mg l(-1) indole-3-butyric acid (IBA) for 7 days in darkness. Changes in the concentrations of endogenous free indole-3-acetic acid (IAA), indole-3-acetylaspartic acid (IAAsp) and free polyamines were determined during culture on root-inducing medium. In extracts of whole shoots, the concentration of free IAA showed a transient peak at 60 h (around 48 h in extracts from basal shoot portions) and then remained at a relatively low concentration for the remainder of the 7-day culture period. The concentration of IAAsp in extracts of whole shoots peaked at about the same time as the concentration of free IAA, whereas the IAAsp concentration in extracts from basal shoot portions peaked earlier, at around 12 h. The concentrations of free polyamines in extracts of whole shoots increased soon after the shoots were transferred to root-inducing medium. The concentrations of IAA and IAAsp remained stable when the rooted shoots were transferred to a vermiculite/gelrite mixture (without auxin) and grown in light. 相似文献
20.
Four enyne derivatives (1-4) and quercitrin were isolated during a bioassay-guided chromatographic separation of a methanolic extract of Erigeron apiculatus. Matricarialactone (1) and lachnophyllumlactone (2) showed a high fungitoxic activity against Pyricularia oryzae. Matricaria acid methyl ester (3) and lachnophyllum acid methyl ester (4) were, instead, less active. 相似文献