排序方式: 共有21条查询结果,搜索用时 15 毫秒
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辛基酚聚氧乙烯醚琥珀酸酯磺酸二钠盐的合成研究 总被引:3,自引:0,他引:3
以辛基酚聚氧乙烯醚,顺丁二酸酐,亚硫酸钠为原料,合成了辛基酚聚乙烯醚琥珀酸酯磺酸二钠盐,探讨了反应温度和反应时间对酯化和磺化反应的影响 相似文献
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以对特辛基苯酚为主要原料,与新制备的二氯化硫在四氯化碳溶剂中反应,合成了2,2’-硫代双对特辛基苯酚(简称硫代双酚)。确定了反应最佳工艺条件:反应温度 6~8℃,反应时间 2 h,对特辛基苯酚与二氯化硫摩尔比(简称酚硫比)2.0:1,溶剂与对特辛基苯酚的重量比(简称剂酚比)3.2:1,石油醚(30~60℃)中重结晶,得到硫代双酚收率达87%以上。 相似文献
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采用固相萃取-气相色谱法检测防水服中烷基酚(APs)类物质,通过比较C18柱、MAX柱、WAX柱和Abselut NEXUS柱四种固相萃取剂的洗脱剂种类、洗脱剂用量、洗脱速率和吸附容量,其结果表明,以Abselut NEXUS柱作为萃取剂,在3 mL甲醇作为洗脱剂,洗脱速率为3 mL/min的条件下,对防水服的水样进行固相萃取,然后用GC进行检测,在0.1~10.0 mg/L范围内线性关系良好。该方法对辛基酚(OP)和壬基酚(NP)检出限分别是0.013 mg/L和0.014 mg/L,加标回收率分别为98.45%和94.06%;相对标准偏差均小于3.5%,能够适用于市售防水服样品的检测。 相似文献
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本文研究了以活性白土,为催化剂,利用蓖麻油制癸二酸副产仲辛醇和苯酚合成辛基酚的反应。此法所得辛基酚收率高,经柱层析和薄层层析分离,红外光谱鉴定其主要组分为邻位和对位辛基酚。 相似文献
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Xin Liu Takeshi Ohta Takeshi Kawabata Fusako Kawai 《International journal of molecular sciences》2013,14(1):1218-1231
Ethoxy (EO) chain nonylphenol dehydrogenase (NPEO-DH) from Ensifer sp. AS08 and EO chain octylphenol dehydrogenase from Pseudomonas putida share common molecular characteristics with polyethylene glycol (PEG) dehydrogenases (PEG-DH) and comprise a PEG-DH subgroup in the family of glucose-methanol-choline (GMC) oxidoreductases that includes glucose/alcohol oxidase and glucose/choline dehydrogenase. Three-dimensional (3D) molecular modeling suggested that differences in the size, secondary structure and hydropathy in the active site caused differences in their substrate specificities toward EO chain alkylphenols and free PEGs. Based on 3D molecular modeling, site-directed mutagenesis was utilized to introduce mutations into potential catalytic residues of NPEO-DH. From steady state and rapid kinetic characterization of wild type and mutant NPEO-DHs, we can conclude that His465 and Asn507 are directly involved in the catalysis. Asn507 mediates the transfer of proton from a substrate to FAD and His465 transfers the same proton from the reduced flavin to an electron acceptor. 相似文献
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HUANG Hui DENG Xu-xiu ZHANG Hua-wei LIU Yun XU Ying-jiang GONG Xiang-hong ZHANG Xiu-zhen 《食品科学》2013,34(24):110
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建立了羊绒制品中双酚A、4-n-壬基酚和辛基酚3种酚类环境激素的高效液相色谱二极管阵列荧光检测方法.样品经索氏提取后,在Shim-pack XR-ODSⅡ快速色谱柱上分离,采用甲醇/乙腈/水(体积比为30∶50∶20)为流动相,紫外检测波长为225 nm,荧光检测激发波长为228 nm,发射波长为305 nm,外标法定... 相似文献
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