色谱纯甲醇的制备研究

随着液相色谱的广泛应用，作为反向液相色谱流动相的色谱纯甲醇的需求量与日俱增，产品供不应求。但色谱纯甲醇要求纯度很高，且在紫外波段(220～280nm)内需很高的透光率。这给色谱纯甲醇的制备增添了很大困难。因而，色谱纯甲醇价格较高，目前东北三省尚无生产厂家，主要依靠外省或国外进口。如何由工业级甲醇制备色谱纯甲醇是本研究的主要课题，实验原理是通过测定影响透气率的主要因素，再通过2．4-二硝基苯肼除去醛、酮，再用浓碱溶液中和羧酸、皂化酯类，再进行精馏，从而获得满意的结果。     

1-(2-羟基3,5-二硝基苯基)-3-[4-(苯基偶氮)苯基]-三氮烯与镍的显色反应及其分析应用

研究了新合成的 1-( 2-羟基-3,5- 二硝基苯基 )- 3-[4 -(苯基偶氮 )苯基 ] - 三氮烯 (HDNPAPT)试剂与镍的显色反应。在Na2 B4 O7 NaOH介质中 (pH10. 0～ 10. 6)及乳化剂OP存在下 ,镍与HDNPAPT形成稳定的 1:1红色络合物 ,λmax=5 45nm ,表观摩尔吸光系数ε545=1.45× 10 5,镍浓度在 0～ 8μg/2 5mL范围内符合比尔定律。拟定的新方法已应用于铝合金中微量镍的测定 ,结果满意     

香草醛缩2，4-二硝基苯腙的合成和抑菌性研究

利用香草醛和2,4-二硝基苯肼的缩合反应合成香草醛缩2，4-二硝基苯腙，利用红外、紫外光谱和元素分析进行了结构表征。采用琼脂扩散法，以金黄色葡萄球菌、短小芽孢杆菌、大肠杆菌、沙门氏菌为生物指标，研究了香草醛缩2，4-二硝基苯腙对4种菌种的抑制作用，结果表明，在一定的浓度范围内，目标产物对所受试菌种具有一定的抑制作用。     

Recruiting the Host's Immune System to Target Helicobacter pylori's Surface Glycans

Due to the increased prevalence of bacterial strains that are resistant to existing antibiotics, there is an urgent need for new antibacterial strategies. Bacterial glycans are an attractive target for new treatments, as they are frequently linked to pathogenesis and contain distinctive structures that are absent in humans. We set out to develop a novel targeting strategy based on surface glycans present on the gastric pathogen Helicobacter pylori (Hp). In this study, metabolic labeling of bacterial glycans with an azide‐containing sugar allowed selective delivery of immune stimulants to azide‐covered Hp. We established that Hp's surface glycans are labeled by treatment with the metabolic substrate peracetylated N‐azidoacetylglucosamine (Ac₄GlcNAz). By contrast, mammalian cells treated with Ac₄GlcNAz exhibited no incorporation of the chemical label within extracellular glycans. We further demonstrated that the Staudinger ligation between azides and phosphines proceeds under acidic conditions with only a small loss of efficiency. We then targeted azide‐covered Hp with phosphines conjugated to the immune stimulant 2,4‐dinitrophenyl (DNP), a compound capable of directing a host immune response against these cells. Finally, we report that immune effector cells catalyze selective damage in vitro to DNP‐covered Hp in the presence of anti‐DNP antibodies. The technology reported herein represents a novel strategy to target Hp based on its glycans.     

Anti-allergic activity of grapeseed extract (GSE) on RBL-2H3 mast cells

Grapeseed extract (GSE) is a rich source of natural phenolic compounds and possesses various pharmacological activities, including antioxidant, anticarcinogenic and anti-inflammatory properties. However, effects of GSE on immunoglobulin (Ig) E-mediated allergic responses still remain elusive. In the present study, the effects of GSE on activation and degranulation of RBL-2H3 mast cells were investigated. GSE pretreatments (20-100 μg/ml) reduced IgE-antigen mediated release of β-hexosaminidase and histamine in RBL-2H3 cells. Additionally, GSE reversibly inhibited expression of FcεRI on RBL-2H3 cells. GSE treatments caused a significant elevation of intracellular cAMP levels, whereas the Ca²⁺ influx upon antigen stimulation was inhibited. Suppression on FcεRI expression together with decreased calcium uptake and increased cAMP level might be involved in attenuated degranulation of mast cells by GSE treatment. Our results suggest a possible pharmaceutical application of GSE in treating type I allergic diseases.     

5,7-二硝基-1-(2′,4′-二硝基苯基)苯并三唑的合成

介绍了一种起爆炸药的合成方法,由苯并三唑和2,4 -二硝基氟苯在溶剂中缩合制得1-(2′,4′-二硝基苯基)苯并三唑,然后硝化得到5,7 -二硝基-1-(2′,4′-二硝基苯基)苯并三唑.     

Expanding the Genetic Code for a Dinitrophenyl Hapten

Haptens, such as dinitrophenyl (DNP) are small molecules that induce strong immune responses when attached to proteins or peptides and, as such, have been exploited for diverse applications. We engineered a Methanosarcina barkeri pyrrolysyl‐tRNA synthetase (mbPylRS) to genetically encode a DNP‐containing unnatural amino acid, N⁶‐(2‐(2,4‐dinitrophenyl)acetyl)lysine (DnpK). Although this moiety was unstable in Escherichia coli, we found that its stability was enhanced in mammalian HEK 293T cells and was able to induce selective interactions with anti‐DNP antibodies. The capability of genetically introducing DNP into proteins is expected to find broad applications in biosensing, immunology, and therapeutics.     

笼形八(二硝基苯基)硅倍半氧烷的合成及性能研究

采用两种工艺路线制备了八(二硝基苯基)硅倍半氧烷(ODNPS),收率分别达到91%和86%。对获得的样品的结构进行了表征,表明八(2,4-二硝基苯基)硅倍半氧烷是一步法的唯一主要产物,但八(3,5-二硝基苯基)硅倍半氧烷和八(2,4-二硝基苯基)硅倍半氧烷同时出现在二步硝化法产物中。研究了ODNPS作为含能材料的安全性能,真空安定性试验发现它的放气量为0.13mL·g-1.48h(100℃),10kg落锤测试的特性落高H50为30.7cm;用线扫描摄像实时燃速测定系统测得燃烧速度为4.42mm·s-1(5MPa);快速分解爆炸温度为393℃。表明ODNPS是一种热稳定性较高的含能材料。