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目的 研究祖师麻的化学成分。方法 采用硅胶柱色谱,Pre-TLC,Pre-HPLC等方法进行分离纯化,并通过理化常数和波谱数据分析进行结构鉴定。结果 分离得到6个已知的木脂素类化合物,分别鉴定为(-)-松脂酚 ((-)-pinoresinol,1)、(+)-丁香树脂酚((+)-syringaresinol,2)、(+)-里立脂素B二甲醚((+)-liriorosinol-B-dimethyl ether,3)、(+)-丁香树脂酚双葡萄糖苷((+)-syringaresinol-di-O-β-D-glucoside,4)、罗汉松脂醇(matairesinol,5)、woonenoside Ⅺ(6)。结论 化合物3、6为从瑞香属植物中首次分离得到,4、5为从祖师麻中首次分离得到。 相似文献
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红松松针中木脂素类成分的分离与鉴定 总被引:1,自引:0,他引:1
目的研究红松松针中的木脂素类成分,为松属植物的化学分类学研究提供依据。方法采用反复硅胶、聚酰胺、ODS、Sephadex LH-20柱色谱等方法进行分离纯化,根据理化性质和波谱分析对分离得到的化合物进行结构鉴定。结果从红松松针中分离得到8个化合物,分别鉴定为(+)-异落叶松脂素-9-O-β-D-吡喃木糖苷((+)-isolariciresinol-9-O-β-D-xylopyranoside,1)、(+)-异落叶松脂素-9-O-β-D-吡喃葡萄糖苷((+)-isolariciresinol-9-O-β-D-glucopyranoside,2)、7S,8R-苏式-3′,4,9′-三羟基-3-甲氧基-7,8-二氢苯并呋喃-1′-丙醇基新木脂素-9-O-α-L-吡喃鼠李糖苷(7S,8R-threo-3′,4,9′-trihydroxy-3-methoxy-4′,7-epoxy-neolignan-9-O-α-L-rhamnopyranoside,3)、7S,8R-苏式-3′,9,9′-三羟基-3-甲氧基-7,8-二氢苯并呋喃-1′-丙醇基新木脂素-4-O-α-L-吡喃鼠李糖苷(7S,8R-threo-3′,9,9′-trihydroxy-3-methoxy-4′,7-epoxy-neolignan-4-O-α-L-rhamnopyranoside,4)、7R,8S-赤式-4,7,9-三羟基-3,3′-二甲氧基-8-O-4′-新木脂素-9′-O-α-L-吡喃鼠李糖苷(7R,8S-erythro-4,7,9-trihydrox-y-3,3′-dimethoxy-8-O-4′-neolignan-9′-O-α-L-rhamnopyranoside,5)、7S,8S-苏式-4,7,9-三羟基-3,3′-二甲氧基-8-O-4′-新木脂素-9′-O-α-L-吡喃鼠李糖苷(7S,8S-threo-4,7,9-trihydroxy-3,3′-dimethoxy-8-O-4′-neolignan-9′-O-α-L-rhamnopyranoside,6)、7S,8S-苏式-3′,4,7,9-四羟基-3-甲氧基-8-O-4′-新木脂素-9′-O-α-L-吡喃鼠李糖苷(7S,8S-threo-3′,4,7,9-tetrahydroxy-3-methoxy-8-O-4′-neolignan-9′-O-α-L-rhamnopyranoside,7)、7R,8S-赤式-3′,4,9,9′-四羟基-3-甲氧基-8-O-4′-新木脂素-7-O-β-D-吡喃葡萄糖苷(7R,8S-erythro-3′,4,9,9′-tetrahydroxy-3-methoxy-8-O-4′-neolignan-7-O-β-D-glucopyr-anoside,8)。结论化合物1~8均为首次从红松中分离得到。 相似文献
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沈素 《中国医院用药评价与分析》2011,(8):677-679
目的:本文就环脂肽类抗生素的特性及达托霉素临床应用情况进行小结和评价。方法:对国内、外近期文献进行分析、评价。结果与结论:作为新一类抗生素,环脂肽类截然不同的作用机制,使其可能成为多重耐药菌感染的治疗药物。 相似文献
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肽疫苗与普通全蛋白(或基因免疫中的全基因)相比有诸多优点,如纯度高,可诱生高特异性免疫应答。但是,合成肽诱发免疫需要毒性佐剂。脂肽作为肽疫苗的一种形式,早在十年前就已被发现,它们可以在无佐剂条件下诱生全面的免疫应答。本文介绍了脂肽疫苗的过去,研究进展以及与脂肽疫苗合成、配方及接种途径有关的问题。脂肽疫苗粘膜应用的进展将为抗粘膜表面感染的病原体提供理想的策略。 相似文献
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摘 要 目的:建立高效液相色谱法测定脱皮马勃中白色线状环脂肽的含量。方法: 采用Welchrom C18色谱柱(200 ×4.6 mm, 5 μm),流动相为乙腈-水(50∶50),流速1.0 ml·min-1,检测波长214 nm。结果: 白色线状环脂肽的线性范围为0.25~40 μg(r=0.999 9);平均回收率为100.89%,RSD=2.51%(n=9)。结论:该法操作简单、快速、可作为脱皮马勃中白色线状环脂肽的含量测定方法。 相似文献
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Conformational variety in cyclic tripeptides was examined using a combination of stereochemical and energy minimization methods. Four different conformations were found possible: (i) a threefold symmetrical one with all peptide units in cis configuration, with very little nonplanarity; (ii) an asymmetrical one with all cis units and with a larger nonplanarity (ccc); and (iii) two possible conformations with two cis and one trans peptide unit, (cct)1 and (cct)2. All these conformations can accommodate both sarcosyl and prolyl residues, which are known to occur in cis peptide units. The symmetric and the (cct)2 conformations can accommodate only a homo-isomeric sequence of prolyl residues, and the other two asymmetric conformations (ccc) and (cct)1 can accommodate hetero-isomeric sequence of Pro. In order to relieve some severe steric hindrances cis peptide units show a need-based flexibility in the peptide bond angles. All the four conformations are known to occur in solid state as well and the results obtained compare reasonably well with the available crystal structure information. 相似文献
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蜂毒溶血肽的研究进展 总被引:3,自引:0,他引:3
目的 了解蜂毒溶血肽的结构、功能和其分子生物学研究进展。方法 综述蜂毒溶血肽的结构和功能特点,在医疗、农业及生物膜研究中的应用,分离纯化中所存在的问题,分子生物学研究进展。结果 蜂毒溶血肽是蜜蜂毒腺产生的一种强碱性有毒多肽,其分子立体结构呈短棒状,具抗炎、抗辐射作用,可在生物膜中形成离子通道,从蜂毒中分离的蜂毒溶血肽常被磷脂酶A2污染,蜂毒溶血肽cDNA已被克隆得到。结论 基因工程技术是大规模生产应用蜂毒溶血肽的一条新途径。 相似文献
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目的 以质谱为导向对肾指海绵Reniochalina sp.中的环肽类成分进行研究。方法 采用质谱引导的程序性分离手段定向追踪并分离纯化海绵中的环肽类成分;通过理化常数测定、波谱数据比对确定化合物结构;利用CCK-8法对化合物进行初步细胞毒活性评价。结果 从肾指海绵Reniochalina sp.中分离获得3个环肽类化合物,分别鉴定为stylopeptide 1 (1)、hymenamide D (2)、axinastatin 2 (3)。化合物1对6种人肿瘤细胞株具有细胞毒性,IC50值范围为6.09 ~ 17.26 μmol/L。结论 化合物1 ~ 3首次分离自Reniochalina属海绵,化合物1是细胞毒性环七肽。 相似文献
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The conformations of chlamydocin and cyclo (Ala-Aib-Phe-D-Pro)(Ala4-chlamy-docin) in chloroform have been investigated by nuclear magnetic resonance, infrared and circular dichroism spectroscopy. The data obtained from these experiments establish an all transoid, bis γ-turn conformation for both compounds in chloroform with the following torsional angles (± 20d?): Ala44-chlamydocin: Aib, Ø+ 60d?, Ψ– 50d?; ω+ 160d?; Phe Ø– 120d?, Ψ+ 120d?, ω– 160d?; D-Pro Ø+ 60d?, Ø– 55d?, ω+ 160d?; Ala Ø– 110d?, Ψ+ 110d?, ω– 160d?. Chlamydocin adopts a closely related conformation in neat chloroform. Nuclear Overhauser Effect (NOE) data are utilized to assign amide bond geometries in the cyclic tetrapeptide ring system. 相似文献
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冬凌草化学成分研究进展 总被引:3,自引:0,他引:3
进入21世纪以来,冬凌草优秀的抗癌表现使国际肿瘤病学界和新药研发机构对其格外关注,许多研究成果纷纷报道,其化学成分及药理活性研究取得较大进展.从本植物分得大量二萜类化合物,并分得一些三萜、甾体、黄酮、生物碱、挥发油、氨基酸、有机酸及其他类化合物,同时合成了许多冬凌草甲素衍生物.药理研究表明多个成分具有抗肿瘤、抗氧化、抗菌、抗炎、抗突变、细胞毒、免疫等活性.文中对2003年后冬凌草化学成分方面研究成果进行详细综述,为从其早日开发出高水平新药奠定基础. 相似文献
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P. Hoogerhout K.J. Stittelaar H.F. Brugghe J. A. M. Timmermans G.J. Ten Hove W. Jiskoot J. H. G. Hoekman P. J. M. Roholl 《Chemical biology & drug design》1999,54(5):436-443
Abstract: The mechanism which enables lipopeptides to induce cytotoxicity is not known. By preparing fluorescent-labeled lipopeptides one might unravel the mechanism of their entry into the cell and their intracellular pathway. A method of preparing double-fluorescent-labeled peptides by solid-phase chemistry is described. As model peptides we have chosen analogs of the sequence RRYPDAVYL, which occurs in the measles fusion protein (F438–446) and is an epitope for cytotoxic T lymphocytes. The peptides Pal-KTMRKKKRRYPDAVKFLL ( 7 ) and Pal-KFLKKKRRYPDAVKTMRL ( 8 ), in which Pal is palmitoyl and KTMR and KFL are Nε-carboxytetramethylrhodamine- and Nε-carboxyfluorescein-labeled lysyl residues, respectively, were prepared and obtained in ≈ 30% yield after purification by high-performance liquid chromatography. The fluorescence of fluorescein and tetramethylrhodamine in lipopeptide Pal-KTMRKKKRRYPDAVKFLL ( 7 ) was quenched to 98–99% due to intramolecular interaction of the labels. On incubation with trypsin (i.e. cleavage at the KKKRR-site) the fluorescence of both labels was restored. The intracellular routing of lipopeptide Pal-KTMRKKKRRYPDAVKFLL was studied with human melanoma cell line, Mel/J, which was transfected with human leukocyte antigen B*2705. It appeared that the double-fluorescent-labeled lipopeptide was able to induce antigen-specific cytotoxicity. Furthermore, preliminary confocal microscopical studies indicated that this lipopeptide is observed intracellularly. 相似文献