新型吡唑Schiff碱及金属配合物的合成和抑菌活性

以3-氨基-4-氰基吡唑和芳醛为原料合成了10个新型吡唑Schiff碱及铜(II)、镍(II)、锌(II)、钴(II) 4个金属配合物. 用元素分析, IR, 1H NMR及单晶解析表征了Schiff碱及金属配合物的结构. 测定了Schiff碱及金属配合物对金黄色葡萄球菌、大肠杆菌、枯草杆菌和绿脓杆菌的抑菌活性. 生物活性研究表明, Schiff碱及金属配合物对金黄色葡萄球菌、大肠杆菌和绿脓杆菌都有较好的抑菌效果, 其中铜(II)和锌(II)配合物对金黄色葡萄球菌和大肠杆菌的抑菌活性最好.     

噻唑类不对称双缩二氨基硫脲的合成及其抗菌活性研究（英文）

噻唑-5-甲醛与氨基硫脲缩合反应,高产率的合成了14个未见文献报道的新型双缩二氨基硫脲类化合物,其结构经光谱和元素分析所表征。分别进行其对金黄色葡萄球菌、大肠杆菌、枯草芽孢杆菌、绿脓杆菌的抗菌活性测试。初步结果表明化合物3d,3f,3h对绿脓杆菌和金黄色葡萄球菌有很好的抑菌效果。     

新型脱氧胆酸1,2,4-三唑席夫碱类化合物的微波合成及其抗菌活性研究（英文）

利用微波辐射技术合成了16个未见文献报道的新型含1,2,4-三唑希夫碱结构的脱氧胆酸化合物,该方法具有反应时间短、产率高等优点;其结构经光谱和元素分析所确证。分别进行其对金黄色葡萄球菌、枯草芽孢杆菌、绿脓杆菌和大肠杆菌的抗菌活性测试。初步结果表明部分化合物对绿脓杆菌和金黄色葡萄球菌有很好的抑菌效果。其中化合物8d具有潜在的药物应用前景。     

两个基于依诺沙星的稀土配合物的合成、晶体结构、与DNA作用和抗菌活性

通过溶剂热-溶液挥发法合成得到了2个基于依诺沙星(HEx)的稀土配合物[Ce(Ex)4].39H2O(1)和[Sm2(Ex)4(HEx)2(ox)].24H2O(2),并运用红外光谱、元素分析和X-射线单晶衍射等研究手段表征了它们的结构。研究结果表明:配合物1为单核配合物;配合物2为双核配合物。紫外滴定和荧光滴定研究结果表明:它们均能以插入的方式作用于小牛胸腺DNA,结合常数(Kb)分别为4.45×104和6.56×104mol-1.L;抗菌实验结果表明它们对革兰氏菌和真菌的活性均要优于依诺沙星配体本身。     

一种新型水解明胶铈配合物的抑菌活性研究

报道了用水相法合成水解明胶铈配合物,采用红外光谱证明了水解明胶与铈的配合反应.用厚平板洞穴法对真菌为芽孢菌、金黄色葡萄球菌和大肠杆菌的抑菌活性进行了测定,结果表明,配合物对芽孢菌、金黄色葡萄球菌和大肠杆菌的抑制能力较同浓度铈增强,且随着铈浓度的增加,抑菌活性增强.     

磺化木犀草素金属配合物的合成及抗氧化、抗菌活性研究

利用木犀草素、硫酸和金属盐为原料,合成了4种木犀草素磺酸金属配合物,利用红外光谱、元素分析、核磁共振光谱和质谱等手段表征了配合物的结构.以DPPH清除率、抑菌环的大小检测配合物的抗氧化、抗菌活性,结果表明木犀草素磺酸金属配合物对DPPH的清除率和对金黄色葡萄球菌和大肠杆菌的抑制作用随浓度的增大而提高,且效果优于母体木犀草素。     

高价银配合物的制备、表征及抗菌性能研究

以亚乙基双胍、吡啶及吡啶衍生物为配体合成了[AgEn(BigH)_2]_2(SO_4)_3·7H_2O(3)、[Ag(Py)_2(N_2)_2](OH)_2(4)和[Ag(2-Apy)_3(OH)](HSO_4)·H_2O(5)三种较稳定的高价银配合物。产物结构经红外光谱、元素分析和XPS进行表征。通过最小抑菌浓度(MIC)和生长抑制曲线来检测配合物的抗菌能力,并对配合物进行光稳定测试。抗菌实验结果显示,所有的配合物在0.5μg/mL浓度下就开始对测试菌产生抑制作用,对大肠杆菌的MIC分别为10、5和5μg/mL,对金黄色葡萄球菌的MIC为40、20和20μg/mL。配合物对大肠杆菌的抗菌活性高于对金黄色葡萄球菌。     

邻香草醛缩邻甲氧基苯胺镍配合物的合成、表征及抗菌活性

通过邻香草醛与邻甲氧基苯胺的缩合反应制得邻香草醛席夫碱,并通过溶剂扩散法合成其金属镍配合物,其结构经红外、核磁共振、紫外及X-单晶衍射等表征。采用纸片法测定了两种化合物对大肠杆菌、金黄色葡萄球菌和白色念珠菌的抑制活性。结果表明∶邻香草醛缩邻甲氧基苯胺席夫碱及其镍配合物对大肠杆菌、金黄色葡萄球菌和白色念珠菌均有较好的抑菌...     

邻菲咯啉镉配合物的合成、晶体结构及抑菌活性

合成了以邻菲咯啉为配体的金属镉的配合物,利用红外光谱、元素分析、单晶衍射和热重分析等手段对其结构及性质进行了表征和分析,并研究了金属配合物对金黄色葡萄球菌、大肠杆菌、酵母菌的抑菌活性.结果表明,此类配合物对三类菌种均有不同程度的抑制作用.     

苯磺酰苯丙氨酸、邻菲咯啉Mg(Ⅱ)配合物的合成、晶体结构及抗菌活性

以MgCl2、苯磺酰苯丙氨酸(BPPA)和邻菲咯啉为原料,合成了一个新型镁配合物[Mg(BPPA)2(phen)(H2O)2].(phen).2(H2O)。对其进行了元素分析、红外光谱分析,并用X-射线衍射测定了它的单晶结构。结果表明:配合物属于三斜晶系,P空间群,配合物分子通过分子内和分子间氢键以及π-π堆积作用形成了一维链状结构。初步研究了配体及配合物的抗菌活性,配合物对大肠杆菌、白葡萄球菌及枯草芽孢杆菌有一定的抗菌活性,而配体却没有抗菌活性。     

Palladium(II) complex with S-allyl-L-cysteine: new solid-state NMR spectroscopic measurements, molecular modeling and antibacterial assays

Nuclear magnetic resonance studies, molecular modeling and antibacterial assays of the palladium(II) complex with S-allyl-L-cysteine (deoxyalliin) are presented. Studies based on solid and solution 13C and 15N nuclear magnetic resonance (NMR) spectroscopy confirmed that the palladium(II) complex preserved the same structural arrangement in both states, with no modifications on coordination sphere when dissolved in water. Density functional theory (DFT) studies stated that the trans isomer is the most stable one. Antibacterial activities of S-allyl-L-cysteine and its palladium(II) complex were evaluated by antibiogram assays using the disc diffusion method. The palladium(II) complex showed an effective antibacterial activity against Staphylococcus aureus (Gram-positive), Escherichia coli and Pseudomonas aeruginosa (Gram-negative) bacterial cells.     

2-呋喃甲酰腙衍生物的合成、荧光性质及抑菌活性

以2-呋喃甲醛、苯甲酰肼及其衍生物为原料,合成了4个新型呋喃酰腙（4a~4d）,用溶剂挥发法获得了酰腙4a的单晶,并用X射线单晶衍射仪测定了晶体和分子结构。 通过元素分析、核磁共振、红外光谱、紫外光谱和荧光光谱等技术手段对酰腙（4a~4d）进行了表征。 结构分析表明,酰腙4a通过分子间氢键和分子间呋喃环错位面对面π…π作用力构成二维链式层状结构;荧光分析表明,酰腙4c拥有较强的荧光发射。 采用琼脂扩散法测试了酰腙（4a~4d）对大肠杆菌、金黄色葡萄球菌、绿脓杆菌的抑制活性,结果显示,酰腙4c对金黄色葡萄球菌有显著的抑制活性。     

Antibacterial evaluation of some Schiff bases derived from 2-acetylpyridine and their metal complexes

A series of Schiff bases derived from 2-acetylpyridne and their metal complexes were characterized by elemental analysis, NMR, FT-IR and UV-Vis spectral studies. The complexes were screened for anti-bacterial activity against Methicillin-resistant Staphylococcus aureus (MRSA), Acinetobacter baumanni (AC), Klebsiella pneumonie (KB) and Pseudomonas aeruginosa (PA) using the disc diffusion and micro broth dilution assays. Based on the overall results, the complexes showed the highest activities against MRSA while a weak antibacterial activity was observed against A. baumanii and P. aeruginosa.     

铜树枝晶的水热合成以及结构表征和抗菌性能评价(英文)

在乙醇胺-水混合溶液中采用水热处理硫酸铜的方法制备了多结构的铜树枝晶;采用X射线粉末衍射仪、扫描电子显微镜、透射电子显微镜分析了所得样品的结构和形貌;采用牛津杯法评价了其对金黄葡萄球菌、枯草芽孢杆菌、大肠杆菌和绿脓杆菌的抗菌性能.结果表明,铜树枝晶由一个长的一级中心主干和许多高度对称分布在主干两侧的二级分支结构构成,且形貌均匀;反应温度、反应时间以及溶剂组成对铜树枝晶的形貌有很大影响.与此同时,铜树枝晶表现出选择性的抗菌行为,对金黄葡萄球菌、枯草芽孢杆菌和绿脓杆菌更有效.     

Synthesis of J-111,347, a novel 1 beta-methylcarbapenem with broad-spectrum antibacterial activity

Synthesis of J-111,347 (1), a new 1 beta-methylcarbapenem with broad-spectrum antibacterial activity including that against methicillin-resistant Staphylococcus aureus (MRSA) and Pseudomonas aeruginosa, was achieved via diastereoselective preparation of a side-chain thiol 3 from an optically active (R)-3,4-dihydroxybutanal 4.     

Essential oil analysis and antibacterial activity of Rosmarinus tournefortii from Algeria

The volatile compounds obtained by hydrodistillation of the aerial parts of Rosmarinus tournefortii De Noé. growing wild in the occidental region of Algeria were analyzed by GC/MS. Thirty-six compounds were characterized representing 95.6% of the essential oil, with camphor (37.6%), 1,8-cineole (10.0%), p-cymene-7-ol (7.8%), and borneol (5.4%) as the major components. The antimicrobial activity was evaluated against three pathogenic bacteria: Gram-negative (Escherichia coli and Pseudomonas aeruginosa) and Gram-positive (Staphylococcus aureus). The minimum inhibitory concentration (MIC; mg/mL) was determined by sub-culture on Muller Hinton agar plates. The essential oil exhibited strong antibacterial activity against E. coli and P. aeruginosa, and was also active against Staphylococcus aureus.     

Phenolic constituents of Cassia seeds and antibacterial effect of some naphthalenes and anthraquinones on methicillin-resistant Staphylococcus aureus.

Thirteen phenolic glycosides including six new compounds were isolated from seeds of Cassia tora (Leguminosae). The structures of the new compounds, rubrofusarin triglucoside (7), nor-rubrofusarin gentiobioside (9), demethylflavasperone gentiobioside (10), torachrysone gentiobioside (11), torachrysone tetraglucoside (12) and torachrysone apioglucoside (13), were elucidated on the basis of spectroscopic and chemical evidence. The effects of the phenolic glycosides, their aglycones and several other compounds structurally related to them on Escherichia coli K12, Pseudomonas aeruginosa PAO1 and some strains of Staphylococcus aureus were then examined. Among them, torachrysone (15), toralactone (16), aloe-emodin (18), rhein (19) and emodin (20) showed noticeable antibacterial effects on four strains of methicillin-resistant Staphylococcus aureus with a minimum inhibitory concentration of 2-64 micrograms/ml. On the other hand, the phenolic compounds tested did not show strong antibacterial effects on E. coli and P. aeruginosa.     

Correlation between chemical composition and antibacterial activity of essential oils from fifteen Eucalyptus species growing in the Korbous and Jbel Abderrahman arboreta (North East Tunisia)

The essential oils of fifteen Eucalyptus species harvested from the Jbel Abderrahman and Korbous arboreta (North East Tunisia) were screened for their antibacterial activities by the agar disc diffusion method. Eighteen major components as identified by GC/FID and GC/MS were selected for a study of the chemical and biological activity variability. The main one was 1,8-cineole, followed by spathulenol, trans-pinocarveol, α-pinene, p-cymene, globulol, cryptone, β-phellandrene, viridiflorol, borneol, limonene and isospathulenol. The chemical principal component analysis identified five species groups and subgroups, where each group constituted a chemotype, however that of the values of zone diameter of the inhibition (zdi) identified six groups of Eucalyptus oils, characterized by their antibacterial inhibition ability. The strongest activity was shown by E. platypus oil against Enterococcus faecalis and by E. lamannii oil against Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli. A correlation between the levels of some major components and the antibacterial activities was observed.     

Antimicrobial activity and pollen composition of honey samples collected from different provinces in Turkey

The antibacterial activity of honey samples from different sources were collected and investigated against Bacillus cereus, Staphylococcus aureus ATCC 25923, Pseudomonas aeruginosa ATCC 27853, Klebsiella pneumoniae ATCC 27736, Morganella morganii, Micrococcus luteus NRRL B-4375, Escherichia coli ATCC 35218, and Candida albicans. Pathogens exhibited different sensitivities towards the honey samples. The results showed that majority of the honey samples (75%) generally inhibitied the bacteria tested. The honey samples which were obtained from Izmir (samples 1 and 2) proved more effective as inhibitors against P. aeruginosa, E. coli, and S. aureus. The honey which was obtained from Mu?la (sample 5) exhibited high anticandidal activity on C. albicans. A comparison of the honey samples on the basis of pollen content revealed that they were heterofloral, and samples which had highest antibacterial activity against P. aeruginosa, E. coli, and S. aureus were dominated by pollen from Chenopodiaceae/Amaranthaceae (sample 1), and Trifolium, Trigonella, Cyperaceae, Zea mays and Anthemis taxa (sample 2). The honey proved more effective on bacteria than antibiotics.