共查询到20条相似文献,搜索用时 546 毫秒
1.
以4-(N,N-二乙氧酰甲基)氨基苯甲醛和邻苯二胺为原料,首先得到了2-[4-N,N-二(乙氧酰甲基)氨基苯基]-1H-苯并咪唑。再将得到的苯并咪唑与5,11,17,23-四叔丁基-26,28-二羟基-25,27-二丁氧基杯[4]芳烃反应,合成了含氨基乙酸酯苯并咪唑杯[4]芳烃荧光分子探针L,并采用红外和核磁对所合成的化合物进行了结构表征和确认。通过紫外和荧光光谱实验研究表明,探针L在甲醇溶液中对Al3+具有选择性识别性能,且不受其他金属离子的干扰;当Al3+物质的量浓度增加到探针浓度的5倍时,探针L的荧光强度降低到最低值。Job's曲线确定了探针与Al3+之间形成物质的量比为1∶1的金属配合物。 相似文献
2.
3.
通过8-羟基喹啉-2-甲醛与水杨酰肼的缩合反应,合成了一种喹啉席夫碱衍生物荧光分子探针(L)。经FT-IR、1H NMR、13C NMR、ESI-MS表征,确定了探针L的分子结构。利用吸收和荧光光谱研究了探针L的识别性能。在DMSO溶液中,探针L与Fe3+能够形成1:1型配合物L-Fe,表观结合常数为4.6 × 104 L/mol。利用该配合物的形成导致的探针荧光猝灭,能够在常见金属离子中高选择性识别Fe3+,检出限为6.8 × 10-8 mol/L。进一步以L-Fe复合物为探针,实现了对草酸的高选择性荧光增强识别,检出限为1.3 × 10-7 mol/L。该方法可用于蔬菜中草酸的检测。 相似文献
4.
5.
香豆素是常用的荧光生色团,在发展新型高效的荧光探针中有重要应用。3-氨基香豆素是一种α,β-脱氢氨基酸内酯,为其发展成为有多种生物活性与其他功能分子提供了独特的结构基础。迄今为止,以3-氨基香豆素为原料发展了一系列荧光探针分子,快速检测金属离子和生物分子。综述了以3-氨基香豆素为原料发展的一系列新的荧光探针,这些探针主要用于选择性地高效探测Hg2+、Ag+、Cu2+、Cu+、Pd2+、Zn2+和Cr2+等多种金属离子、硫离子、半胱氨酸和β-巯基乙醇等生物硫醇、H2O2和活性蛋白质。 相似文献
6.
《山东化工》2015,(9)
根据罗丹明母体结构的闭环(无荧光)与开环(强荧光)的相互转化的机理,设计并合成了2个用于检测铜离子的新型Schiff-base缩合的罗丹明荧光探针RH-2和RH-3。在生理环境下(20 mmol/L PBS缓冲溶液,p H值7.4),当加入Mg2+,Ca2+,Ag+,Cd2+,Co2+,Fe2+,Fe3+,Mn2+,Ni2+,Pb2+,Zn2+,Cr3+,Hg2+和Al3+等金属离子后,探针荧光强度迅速增强,而只有加入铜离子后荧光增强比较小,证明探针对铜离子具有很好的选择性。这种高选择性的荧光探针对于研究生理活动、环境中Cu(II)离子的存在和含量具有潜在应用价值。 相似文献
7.
8.
以萘酰亚胺作为荧光团,通过哌嗪与N-2-氯乙酰氨基喹啉反应得到基于PET原理的荧光增强型Fe3+探针。实验结果表明,在pH=6.46的0.01mol/L Tris-HCl(乙腈∶水=4∶1,V/V)溶液中,探针能选择性识别溶液中的Fe3+,荧光最大增强10倍,不受其他离子的干扰;同时将探针硅烷化修饰后,共价键联到硅胶颗粒上得到荧光增强型Fe3+传感材料,可以检测水溶液中的Fe3+,在2.0×10-5~1.4×10-4 mol/L Fe3+离子含量范围内,荧光强度呈良好的线性关系(R2=0.9023)。 相似文献
9.
10.
Al3+、Cr3+、Fe3+、Ce3+对环境和生物体有重要影响,能同时检测这4种三价金属离子的荧光探针较为少见。以2-氨基蒽和对苯基苯甲醛制备了一种席夫碱类荧光探针Ⅰ,通过1HNMR、HRMS和元素分析对其结构进行了表征。光谱分析实验结果表明,探针Ⅰ在四氢呋喃/水(V(THF)∶V(水)=1∶1)溶液中对三价金属Al3+、Cr3+、Fe3+和Ce3+具有较强荧光响应,有较高选择性和快速响应,且不受其他金属离子或阴离子影响,抗干扰能力强,检测的最适pH范围为5~9。结合高分辨质谱检测、紫外测试和理论计算,证实探针与三价金属的作用机理为:探针与三价金属作用后,分解生成2-氨基蒽,发出荧光。进一步将荧光探针负载于试纸条,成功实现对三价金属的试纸检测。 相似文献
11.
It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples. 相似文献
12.
13.
J. R. Aldrich S. P. Carroll W. R. Lusby M. J. Thompson J. P. Kochansky R. M. Waters 《Journal of chemical ecology》1990,16(1):199-210
Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA. 相似文献
14.
15.
M. S. J. Simmonds W. M. Blaney F. Delle Monache M. Marquina Mac-Quhae G. B. Marini Bettolo 《Journal of chemical ecology》1985,11(12):1593-1599
Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria. 相似文献
16.
2008~2009年世界塑料工业进展 总被引:4,自引:1,他引:3
中蓝晨光化工研究院有限公司《塑料工业》编辑部 《塑料工业》2010,38(3)
收集了2008年7月~2009年6月世界塑料工业的相关资料,介绍了2008~2009年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、环氧树脂、不饱和聚酯树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍。 相似文献
17.
ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究 总被引:15,自引:0,他引:15
建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。 相似文献
18.
19.