芳香/杂环磺胺类碳酸酐酶Ⅱ抑制剂的活性定量预测(英文)

对125个磺胺类碳酸酐酶Ⅱ抑制剂的生物活性进行了预测研究。利用ADRIANA.Code软件计算得到了化合物的一系列2D和3D结构描述符,从中选用了12个描述符进行建模。分别用数学随机划分的方法和Kohonen自组织神经网络的方法把数据集划分成两组不同的训练集和测试集。对于这两组不同的训练集和测试集,分别利用多元线性回归(MLR)和支持向量机(SVM)的方法进行建模,共得到4个模型。其中SVM得到的2个模型,训练集的相关系数在0.92以上,测试集预测的相关系数都在0.90以上。所有模型可进一步用于碳酸酐酶Ⅱ抑制剂的虚拟筛选。     

磺酰胺型分散染料对聚乳酸纤维的染色动力学研究

选用两只吡唑啉酮系磺酰胺型分散染料AY1和AY2研究了聚乳酸纤维的染色动力学,绘制得到恒温上染速率曲线,并计算获得2只染料在聚乳酸纤维上的表观扩散系数。结果表明：在110℃,pH为5.0的染色条件下,磺酰胺型分散染料在聚乳酸纤维上具有较快的上染速率和扩散能力,平衡吸附量较高,半染时间较短;染料结构中与N原子相连的基团链长的增加会减小染料的表观扩散系数,可通过增大半染时间,以增加染料在聚乳酸纤维上的平衡上染量。     

Asymmetric 1,4‐Addition of Diethylzinc to Cyclic Enones Catalyzed by Cu(I)‐Chiral Sulfonamide‐Thiophosphoramide Ligands and Lithium Salts

The chiral sulfonamide‐thiophosphoramide ligand L1 , prepared from the reaction of (1R,2R)‐(−)‐1,2‐cyclohexanediamine with diphenylthiophosphoryl chloride and p‐toluenesulfonyl chloride, was used as a chiral ligand in Cu(MeCN)₄ClO₄‐promoted catalytic asymmetric addition of diethylzinc to cyclic enones using LiCl as an additive in which up to 90% ee can be realized under mild conditions within 0.5 h. This chiral ligand is stable and recoverable after usual work‐up and can be reused in the same catalytic asymmetric reaction. Moreover, it was found that this series of chiral ligands represents a type of S,O‐bidentate ligands on the basis of ¹H NMR, ³¹P NMR and ¹³C NMR spectroscopic investigations. The linear effect of ligand ee and product ee further revealed that the active species is a monomeric Cu(I) complex bearing a single ligand.     

除草剂甲基二磺隆的合成

该文以对甲苯腈为原料,经氯磺化-氨解、氧化、还原、甲磺酰化、醇解反应制得关键中间体2-甲氧羰基-5-甲磺酰氨基甲基苯磺酰胺(Ⅵ),Ⅵ再与4,6-二甲氧基-2-(苯氧基羰基)氨基嘧啶反应得到目标产物甲基二磺隆(Ⅶ),6步反应总收率33.3%,产物及中间体经IR、1HNMR、MS确证结构。与文献合成工艺比较,该法具有原料易得,操作简便,收率高等优点。     

超高效液相色谱法测定乳及乳制品中多种磺胺类药物残留

建立了超高效液相色谱法同时测定乳及乳制品中14种磺胺类药物残留的方法.样品通过乙腈重复提取,饱和正己烷脱脂后浓缩,基质固相分散萃取技术净化,采用ACQUITY UPLCTM BEH C18柱,以甲醇和质量分数0.1％甲酸水溶液为流动相梯度洗脱,用紫外检测器于270 nm波长处检测.回收率在90.4％～104.3％,精密度(RSD)为1.09％～5.73％,检出限分别为0.04～0.09 μg/g.该方法可用于乳及乳制品中14种磺胺类药物残留的同时测定.     

Isolation and Identification of Aerobic Bacteria Carrying Tetracycline and Sulfonamide Resistance Genes Obtained from a Meat Processing Plant

Microbial contamination in food‐processing plants can play a fundamental role in food quality and safety. The purpose of this study was to investigate aerobic bacteria carrying tetracycline and sulfonamide resistance genes from a meat processing plant as possible sources of meat contamination. One hundred swab samples from surfaces of conveyor belts, meat slicers, meat knives, benches, plastic trays, gloves, and aprons were analyzed. A total of 168 isolates belonging to 10 genera were obtained, including Pseudomonas sp. (n = 35), Acinetobacter sp. (n = 30), Aeromonas sp. (n = 20), Myroides sp. (n = 15), Serratia sp. (n = 15), Staphylococcus sp. (n = 14), Enterobacter sp. (n = 11), Escherichia coli (n = 10), Lactococcus sp. (n = 10), and Klebsiella sp. (n = 8). Of the 168 isolates investigated, 60.7% showed resistance to tetracycline and 57.7% to trimethoprim/sulfamethoxazole. The tetracycline resistance genes tetL, tetA, tetB, tetC, tetE, tetM, tetS, tetK, and tetX were found in the frequency of 7.7%, 6.0%, 4.8%, 4.8%, 3.6%, 3.6%, 3.6%, 1.2%, and 0.6%, respectively. Sulfonamide resistance genes sul1 and sul2 were observed in the frequency of 17.9% and 38.1%, respectively. The tetracycline resistance genes tetX was first found in Myroides sp. This investigation demonstrated that food contact surfaces in a meat processing plant may be sources of contamination of aerobic bacteria carrying tetracycline and sulfonamide antibiotic resistance genes.     

食品中磺胺类药物前处理及检测方法研究进展

磺胺类兽药残留是目前重要的动物源性食品安全问题,检测食品中磺胺类兽药残留对人体健康具有重要的意义。检测食品基质中痕量兽药残留依赖于有效的前处理方法和精密的分析仪器。本文论述磺胺类兽药分析检测的研究背景和现状,并对国内外食品中磺胺类兽药残留的传统提取技术和新型提取技术等前处理方法及检测方法进行综述,为食品中磺胺类药物的残留监控提供参考。     

Inhibition of Carbonic Anhydrase IX Suppresses Breast Cancer Cell Motility at the Single-Cell Level

Protein Carbonic Anhydrase IX (CA IX), which is expressed in various hypoxic solid tumors in order to maintain proper pH, is also related to cancer cell adhesion, invasion, and metastasis processes. Here, we investigated whether CA IX inhibition by a highly CA IX selective agent benzenesulfonamide VD11-4-2 triggers changes in individual cell motility. We seeded breast cancer cells on an extracellular matrix-coated glass-bottomed dish and in a microfluidic device with a gradient flow of epidermal growth factor (EGF), tracked individual cell movement, calculated their migration speeds, and/or followed movement direction. Our results showed that the inhibitor VD11-4-2 decreased the speed of CA IX positive breast cancer cells by 20–26% while not affecting non-cancerous cell migration. The inhibitor suppressed the cell migration velocity increment and hindered cells from reaching their maximum speed. VD11-4-2 also reduced CA IX, expressing cell movement towards the growth factor as a chemoattractant. Such a single cell-based migration assay enabled the comprehensive investigation of the cell motility and revealed that VD11-4-2 shows the ability to suppress breast cancer cell migration at a lower concentration than previously tested CA IX inhibitors.     

Inhibitory Effects of Sulfonamide Derivatives on the β-Carbonic Anhydrase (MpaCA) from Malassezia pachydermatis,a Commensal,Pathogenic Fungus Present in Domestic Animals

Fungi are exposed to various environmental variables during their life cycle, including changes in CO₂ concentration. CO₂ has the potential to act as an activator of several cell signaling pathways. In fungi, the sensing of CO₂ triggers cell differentiation and the biosynthesis of proteins involved in the metabolism and pathogenicity of these microorganisms. The molecular machineries involved in CO₂ sensing constitute a promising target for the development of antifungals. Carbonic anhydrases (CAs, EC 4.2.1.1) are crucial enzymes in the CO₂ sensing systems of fungi, because they catalyze the reversible hydration of CO₂ to proton and HCO₃^-. Bicarbonate in turn boots a cascade of reactions triggering fungal pathogenicity and metabolism. Accordingly, CAs affect microorganism proliferation and may represent a potential therapeutic target against fungal infection. Here, the inhibition of the unique β-CA (MpaCA) encoded in the genome of Malassezia pachydermatis, a fungus with substantial relevance in veterinary and medical sciences, was investigated using a series of conventional CA inhibitors (CAIs), namely aromatic and heterocyclic sulfonamides. This study aimed to describe novel candidates that can kill this harmful fungus by inhibiting their CA, and thus lead to effective anti-dandruff and anti-seborrheic dermatitis agents. In this context, current antifungal compounds, such as the azoles and their derivatives, have been demonstrated to induce the selection of resistant fungal strains and lose therapeutic efficacy, which might be restored by the concomitant use of alternative compounds, such as the fungal CA inhibitors.     

含双萘环磺酰胺的合成工艺研究

以7-氨基-4-羟基-2-萘磺酸(J酸、A)为原料,在50-70℃pH=7的条件下,用乙酐酰化得B,然后在乙腈和DMF混合溶液中以碳酸钾为缚酸剂,加入三氯氧磷,在35℃-60℃反应4小时合成了7-氨基-4-羟基-2-萘磺酰氯(C),C用N,N-二甲基乙二胺在乙腈溶剂中回流,在35℃～40℃反应6小时,萃取、重结晶后得标题化合物(D)。与文献报导的工艺相比,省时、工艺稳定、成本降低。用1H,13C-NMR、MS和IR对化合物B、C、D进行了表征。