中空纤维液相微萃取-高效液相色谱法测定纺织品中10种含氯苯酚类化合物

建立了中空纤维液相微萃取-高效液相色谱法测定纺织品中10种含氯苯酚类化合物的方法。系统地优化了影响萃取效率的因素,得到的最佳萃取条件为：萃取溶剂为正己烷,接受相NaOH溶液的浓度为0.10 mol/L,萃取时间为60 min,搅拌速度为600 r/min。在最佳萃取条件下,10种含氯苯酚在0.01～1.00 mg/L范围内线性关系良好（r>0.999）,10种含氯苯酚的检出限（信噪比为3）为0.01 mg/kg,富集倍数为95～101。在空白样品中添加0.01、0.05和0.1 mg/kg 3个不同水平的10种含氯苯酚类化合物,其平均回收率为78.8%～105.1%,相对标准偏差为0.3%～7.3%。研究结果表明该方法灵敏度高、简便、准确,可用于纺织品中含氯苯酚类化合物的测定。     

高效液相色谱法测定木材及其制品中的酚类防腐剂

建立了高效液相色谱法(HPLC)检测木材制品中五氯苯酚(PCP)、四氯苯酚(TeCP)和邻苯基苯酚(OPP)的方法.以甲醇-10mmol/L醋酸铵水溶液为流动相进行梯度洗脱,以C18柱为分离柱,DAD为检测器,检测波长为220 nm,并且对提取方式、提取溶剂、提取时间进行讨论.PCP、TeCP、OPP线性范围分别为0.02～200 mg/L(r=0.99994),0.02～200mg/L(r=0.99990),0.04～200mg/L(r=0.99995);测定检出限均为0.1 mg/kg;回收率96.70%～104.4%,RSD≤3.8%(n=7).方法能够满足木材制品中PCP、TeCP、OPP的分析要求.     

液相色谱同位素稀释质谱联用法测定纺织品中的痕量五氯苯酚

针对挪威PoHS指令、1999/51/EC以及REACH危险物质列表中对五氯苯酚的限量要求,建立了纺织品中痕量五氯苯酚残留量的液相色谱同位素稀释质谱联用法(LC-IDMS)。以酸化正己烷提取纺织品试样中的残留五氯苯酚,在Eclipse Plus C18柱(100mm×2.1mm I.D.,3.5μm)上,采用5mmol/L醋酸铵溶液/甲醇(体积比20∶80)为流动相进行分离,结合电喷雾电离离子化技术,在负离子模式下测定,进行质谱定量分析,以13C-五氯苯酚为内标进行定量。方法的定量限为0.005μg/g,在0.1～0.5μg/g个添加水平范围内的平均回收率为95%～105%,测定精密度为0.805%～1.40%。方法准确、可靠,适用于纺织品中痕量五氯苯酚残留的测定。同位素稀释质谱法作为一个基准方法,对五氯苯酚残留进行检测的计量学方法可靠性验证。     

纺织品、皮革及其制品中五氯苯酚残留量的气相色谱-质谱法测定

介绍应用气相色谱-质谱法测定纺织品、皮革及其制品中防霉剂五氯苯酚的残留量,试样经硫酸溶液酸化后用正己烷提取,用气相色谱-质谱选择离子测定。方法简便、快速、灵敏,检出限20μg／kg,添加回收率86．7％～93．1％,变异系数4．1％～5．9％。     

纺织品中19种含氯苯酚的气相色谱-质谱联用测定及其迁移行为

建立了气相色谱-质谱联用(GC-MS)同时测定纺织品中19种残留含氯苯酚的分析方法。以棉贴衬纺织品为基底材料,采用0.1 mol/L K_2CO_3溶液作为萃取液及衍生化介质,乙酸酐乙酰化,正己烷萃取后进行GC-MS测定,采用选择离子监测进行确证,外标法定量。检出限为2μg/kg,线性范围为0.0004~1.0 mg/L,线性相关系数R~2大于0.999,加标回收率为88.6%~107.6%,相对标准偏差(RSDs,n=7)为1.8%~7.6%,方法可满足纺织品及其制品中19种含氯苯酚类物质的同时检测需求。研究了棉纺织品中含氯苯酚的迁移行为,表明纺织品表面涂层性质、厚度等均对此迁移行为产生一定的影响。     

气相色谱法测定纺织品中五氯苯酚残留量

建立了纺织品中五氯苯酚残留量的测定方法。试样用碳酸钾溶液提取 ,加乙酸酐乙酰化后 ,以正己烷提取乙酰化五氯苯酚 ,用气相色谱 电子俘获检测器 (GC ECD)测定 ,以外标法定量。五氯苯酚的检出限 0 .0 2mg·kg-1,加标回收率 90 %～ 10 5 % ,相对标准偏差≤ 6.7%。     

化妆品中碘丙炔醇丁基氨甲酸酯的高效液相色谱检测及质谱确证

建立了高效液相色谱(HPLC)-二极管阵列检测器(DAD)测定化妆品中碘丙炔醇丁基氨甲酸酯的方法.化妆品样品经超声提取后,高效液相色谱-二极管阵列扫描检测,并在235 nm波长进行分析.用保留时间结合紫外光谱定性,外标法定量,并采用液相色谱-质谱法确证.碘丙炔醇丁基氨甲酸酯的回收率为92.7%～99.8%,相对标准偏差在0.8%～2.1%之间,定量限为20 mg/kg.     

玩具中苯酚和双酚A的高效液相色谱-荧光检测方法研究

采用高效液相色谱分离,荧光检测器检测,建立了三种不同类型的玩具中苯酚和双酚A的测定方法.用超声提取的方式处理样品,对提取溶剂和提取时间进行选择,确定以甲醇-水(65:35,V/V)作为提取溶液,超声提取20 min.苯酚和双酚A分别在0.012～1.0 mg/L、0.03～2.5 mg/L范围内线性良好,相关系数均达到0.9999,检出限分别为0.6 mg/kg和1.5 mg/kg,不同加标水平的回收率为90.5%～104.3%,其相对标准偏差为0.4%～3.8%.该方法操作简便,灵敏度高、重现性好,能有效提取和测定三类玩具中的苯酚和双酚A.     

高效液相色谱法同时测定纺织品中四氯苯酚同分异构体及五氯苯酚和邻苯基苯酚

建立了高效液相色谱法同时测定纺织品中四氯苯酚同分异构体(2,3,4,5-TeCP、2,3,4,6-TeCP、2,3,5,6-TeCP)及五氯苯酚(PCP)和邻苯基苯酚(OPP)的分析方法。样品经甲醇超声提取、浓缩后,采用Symmetry C18色谱柱,以甲醇-10mmol/L乙酸铵溶液为流动相,梯度洗脱,二极管阵列检测器210nm检测。结果表明:三种TeCP同分异构体及PCP、OPP在0.1~20mg/L范围内具有良好的线性关系,相关系数为0.9994~0.9998,样品加标回收率为87.2%~109%,相对标准偏差为0.92%~4.50%,方法的最低检测浓度分别为0.05、0.10、0.05、0.05、0.05mg/kg。该方法高效、简便、准确可靠,可实现现行法规所要求的纺织品中苯酚类物质的同时测定。     

化妆品中士的宁和马钱子碱的高效液相色谱检测及质谱确证

建立了高效液相色谱(HPLC)-二极管阵列检测器(DAD)测定化妆品中士的宁和马钱子碱的方法.膏霜、水剂、散粉、香波、唇膏等不同类型的化妆品样品经超声提取后,高效液相色谱-二极管阵列扫描检测,并在264 nm波长进行分析.用保留时间结合紫外光谱定性,外标法定量,并且采用液相色谱-质谱确证.士的宁的回收率为89.2%～103.5%,相对标准偏差在0.7%～6.0%之间,定量限为2.5 mg/kg,马钱子碱的回收率为86.3%～101.0%,相对标准偏差在0.9%～6.9%之间,定量限为2.5 mg/kg.     

Furyl- and thienyl-silatranes and germatranes

We review our research on the synthesis and study of the physical and biological properties of furyl- and thienylgermatranes and -silatranes.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 725–732, June, 1992.     

Review and patents and literature

The use of the insect cell/baculovirus expression system for producing recombinant proteins of bacterial, plant, insect, and mammalian origin has become widespread. The popularity of this eukaryotic expression system is due to many factors, including (1) potentially high protein expression levels, (2) ease and speed of genetic engineering, (3) ability to accommodate large DNA inserts, (4) protein processing similar to higher eukaryotic cells (e.g., mammalian cells), and (5) ease of insect cell growth (e.g., suspension growth). The following review of the literature discusses two engineering aspects of recombinant protein synthesis by insect cell cultures: bioreactor scale-up and insect cell line selection. Following this review patent abstracts and additional literature pertaining to expression of recombinant proteins in insect cell culture are listed.     

Ground- and excited-state aromaticity and antiaromaticity in benzene and cyclobutadiene

The aromaticity and antiaromaticity of the ground state (S 0), lowest triplet state (T 1), and first singlet excited state (S 1) of benzene, and the ground states (S 0), lowest triplet states (T 1), and the first and second singlet excited states (S 1 and S 2) of square and rectangular cyclobutadiene are assessed using various magnetic criteria including nucleus-independent chemical shifts (NICS), proton shieldings, and magnetic susceptibilities calculated using complete-active-space self-consistent field (CASSCF) wave functions constructed from gauge-including atomic orbitals (GIAOs). These magnetic criteria strongly suggest that, in contrast to the well-known aromaticity of the S 0 state of benzene, the T 1 and S 1 states of this molecule are antiaromatic. In square cyclobutadiene, which is shown to be considerably more antiaromatic than rectangular cyclobutadiene, the magnetic properties of the T 1 and S 1 states allow these to be classified as aromatic. According to the computed magnetic criteria, the T 1 state of rectangular cyclobutadiene is still aromatic, but the S 1 state is antiaromatic, just as the S 2 state of square cyclobutadiene; the S 2 state of rectangular cyclobutadiene is nonaromatic. The results demonstrate that the well-known "triplet aromaticity" of cyclic conjugated hydrocarbons represents a particular case of a broader concept of excited-state aromaticity and antiaromaticity. It is shown that while electronic excitation may lead to increased nuclear shieldings in certain low-lying electronic states, in general its main effect can be expected to be nuclear deshielding, which can be substantial for heavier nuclei.     

多环芳二酐型聚酯亚胺膜的透气性能

多环芳二酐型聚酯亚胺膜的透气性能李悦生，丁孟贤，徐纪平（浙江大学高分子科学与工程研究所，杭州，３１００２７）（中国科学院长春应用化学研究所）关键词聚醚酰亚胺，聚酯酰亚胺，膜，透气性通常的聚酰亚胺加工性能较差，在芳环二酐的苯环间引入醚键等柔性基团后，其...     

Determination and study on residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil

A QuEChERS (quick, easy, cheap, effective, rugged, and safe) method for the determination of benazolin-ethyl and quizalofop-p-ethyl in rape and soil by high-performance liquid chromatography-tandem mass spectrometry has been developed in this study. The residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil were determined with the developed method. The half-lives of benazolin-ethyl in rape straw and soil were 3.7–5.1 days and 14.3–26.3 days, respectively. The half-lives of quizalofop-p-ethyl in rape straw and soil were 5.0-6.1 days and 0.3–9.7 days, respectively. The residue of benazolin-ethyl and quizalofop-p-ethyl in rapeseed and soil were below the detection limit (i.e., 0.5?mg?kg^?1, the maximum residue level of European Union for quizalofop-p-ethyl).