共查询到20条相似文献,搜索用时 62 毫秒
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三氯蔗糖的合成与应用研究进展 总被引:3,自引:0,他引:3
三氯蔗糖是一种新型强力甜味剂,其热量值为零,不会引起人体肥胖和血糖波动,性/价比高。其作为专用甜味剂前景广阔。本介绍了其性质、合成方法等。 相似文献
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玉洁纯(2,4,4′-trichloro-2′-hydroxydiphenyl ether)是一种非离子的高效广谱抗微生物剂,对于一般常见的细菌、真菌及酵母等病原菌,玉洁纯都具有杀灭功效及抑制作用。国外学者长期的临床观察证实含有玉洁纯的牙膏和漱口水能有效地控制菌斑和缓解牙龈炎症状。玉洁纯的毒性极低,并无异味、无刺激感。从玉洁纯的理化性质和药理作用、玉洁纯控制菌斑的机理、玉洁纯在牙膏和漱口水中的应用等3个方面论述了国外学者对玉洁纯在牙膏和漱口水中的作用机理和应用的研究现况,为我国牙膏工业口腔卫生用品的技术革新提供了有益的参考。玉洁纯在我国口腔卫生用品中的应用正在迅速崛起,其发展趋势预计将会带动整个行业。 相似文献
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Synthesis and characterization of novel antimicrobial polymers containing pendent triclosan moieties
Alex J. KugelScott M. Ebert Shane J. StafslienIvan Hevus Ananiy KohutAndriy Voronov Bret J. Chisholm 《Reactive and Functional Polymers》2012,72(1):69-76
Novel antimicrobial copolymers were produced by first converting the commodity biocide, triclosan (TCS), to an epoxy-functional derivative, 2-((5-chloro-2-(2,4-dichlorophenoxy)phenoxy) methyl)oxirane (ETCS), and then reacting ETCS with polyethylenimine (PEI). While neither ETCS or PEI showed high antimicrobial activity toward either the Gram-positive bacterium, Staphylococcus epidermidis, or the Gram-negative bacterium, Escherichia coli, some the copolymers showed very high activity toward both bacteria. Antimicrobial activity for these copolymers was found to be highly dependent on both the molecular weight of the PEI utilized and the concentration of pendent groups derived from ETCS. In general, decreasing PEI molecular weight and increasing TCS pendent group concentration increased antimicrobial activity. Surface tension measurements showed that the molecular parameters affecting antimicrobial activity also affected surface activity in a similar fashion. Thus, it was speculated that the mechanism of antimicrobial activity associated with these copolymers involves interaction of the copolymers with the bacterial cell wall. A comparison of the antimicrobial activity of the most effective copolymers to TCS showed that the copolymers were more effective toward E. coli than pure TCS when compared using an equivalent TCS content (i.e. TCS pendent group content for the copolymers). This characteristic coupled with the fact that the TCS-containing copolymers are highly aqueous soluble liquids as opposed to a crystalline solid of limited solubility may afford utility of these copolymers for a variety of applications. 相似文献
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Ignasi Sirés Nihal Oturan Rosa María Rodríguez Enric Brillas 《Electrochimica acta》2007,52(17):5493-5503
The antimicrobials triclosan (2,4,4′-trichloro-2′-hydroxydiphenyl ether) and triclocarban (N-(4-chlorophenyl)-N′-(3,4-dichlorophenyl)urea) have been degraded by four electro-Fenton systems using undivided electrolytic cells with a Pt or boron-doped diamond (BDD) anode and a carbon felt or O2 diffusion cathode. The main oxidant is hydroxyl radical (OH) produced both on the anode surface from water oxidation and in the medium by Fenton's reaction, which takes place between electrogenerated H2O2 and Fe2+ coming from cathodic reduction of O2 and Fe3+, respectively. Triclosan from saturated aqueous solutions of pH 3.0 is completely removed in all cells, decreasing its decay rate in the order: Pt/carbon felt > BDD/carbon felt > Pt/O2 diffusion > BDD/O2 diffusion, in agreement with their OH generation ability from Fenton's reaction. Glyoxylic, maleic and oxalic acids are identified as aliphatic intermediates. Complexes between oxalic acid and iron ions persist largely in solution, although Fe2+-oxalato complexes are mineralized by OH in the medium and Fe3+-oxalato complexes are destroyed by OH on BDD. Analogous treatments of more concentrated triclosan solutions using a 20:80 (v/v) acetonitrile/water mixture as solvent evidence the role of hydroxyl radicals along the degradation. In this hydroorganic medium hydroxylated derivatives such as 2,4-dichlorophenol, 4-chlorocatechol, chlorohydroquinone and chloro-p-benzoquinone, and carboxylic acids such as maleic, oxalic, formic and acetic acids are detected as products. Complete destruction of iron-oxalato complexes and released Cl− ion involves some oxidizing species coming from parallel acetonitrile oxidation. The same electro-Fenton systems also yield the overall removal of triclocarban in acetonitrile/water mixtures, giving rise to urea, hydroquinone, chlorohydroquinone, 1-chloro-4-nitrobenzene and 1,2-dichloro-4-nitrobenzene as primary intermediates. 相似文献
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合成辣素的制备与应用 总被引:6,自引:0,他引:6
以香兰素和正-壬酸为原料制备了合成辣素,其化学结构经红外光谱、紫外光谱、质谱、核磁共振氢谱验证,把合成辣素作为塑料添加剂加入PVC塑料样品,进行初步的药效测试,结果表明该化合物对老鼠具有显著的驱避作用。 相似文献
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聚乙烯胺的合成与应用 总被引:6,自引:0,他引:6
聚乙烯胺是一种氨基直接连接在碳氢骨架上的具有多种用途的高分子材料 ,尤为重要的是由于氨基的活性较高 ,为功能性高分子材料的制备提供了便利条件。介绍了聚乙烯胺的两类制备方法 ,即聚丙烯酰胺的Hofmann降级反应和聚 (N 酰基 )乙烯胺的水解。综述了聚乙烯胺在现代分离技术、生物医学、催化以及造纸、表面改性、污水处理等领域的应用。指出由N 乙烯基甲 /乙酰胺经聚合、水解制备聚乙烯胺是制备高纯度聚乙烯胺的比较现实的方法 ,对于那些对纯度要求并不很高的应用领域 ,聚丙烯酰胺的Hofmann降级反应则是一种经济可行的办法 ;对于前者应着重提高裂解催化剂的催化活性 ,对于后者则应注重具体生产工艺的改进 ,其中更为重要的是后处理工艺的改进。 相似文献
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