凝胶渗透色谱-高效液相色谱-串联质谱法同时测定烟草中3种抑芽剂残留

建立了用凝胶渗透色谱净化-液相色谱-串联质谱分析烟草中3种抑芽剂残留的方法。卷烟中的待测抑芽剂组分用V(乙酸乙酯)∶V(环己烷)=1∶1超声提取后通过凝胶渗透色谱净化;凝胶色谱柱为Biobeads S-X3玻璃柱(50 g,400 mm×25 mm),流动相为V(乙酸乙酯)∶V(环己烷)=1∶1溶液,流速5 mL/min;收集第10~25 min流出的液体用液相色谱色谱-三重四极杆串联质谱仪测定。在0.5~100 ng/mL的质量浓度范围内,各种抑芽剂标准溶液的线性相关系数均大于0.99。在样品中添加3种抑芽剂(添加水平为5,20,100μg/kg)的混合标准溶液,平均回收率在86.2%~108.4%之间,3种抑芽剂的RSD在1.1%~7.5%之间;方法的检测限在0.01~0.06μg/kg之间。     

全自动在线固相萃取-二维高效液相色谱与质谱联用测定辣椒油中苏丹红

建立了全自动在线固相萃取-二维高效液相色谱与质谱联用快速测定辣椒油中的苏丹红Ⅰ,Ⅱ,Ⅲ,Ⅳ的方法。样品经乙腈和二氯甲烷萃取后,在一维色谱柱(Acclaim PAⅡ,150 mm×3.0 mm×3μm)上分离出苏丹红,通过阀的分段切换,依次富集在SPE柱(Acclaim 120 C18,10 mm×4.6 mm×5μm)上,在线完成净化和萃取富集;再通过阀切换将它们转移至二维色谱流路,在Acclaim 120 C18色谱柱(100 mm×2.1 mm×2.2μm)上分离检测。一维色谱以水-乙腈-甲醇/四氢呋喃(1∶1,V/V)为流动相,进样体积20μL,0.6 mL/min流速梯度洗脱和紫外-可见检测器(λ=254 nm)监测分离状况;二维色谱以水-乙腈-甲酸/乙腈(1∶1000,V/V)为流动相,0.3 mL/min流速梯度洗脱,采用单四极质谱仪,选择离子方式检测。整个分析流程27 min即可完成。4种苏丹红的保留时间的相对标准偏差均小于0.1%,色谱峰面积的相对标准偏差均小于2%(n=7);在0.6～60μg/L范围内峰面积与进样质量浓度的线性相关系数均大于0.9958;加标回收率为50%～97%;方法检出限均小于0.2μg/L(S/N=3)。测定结果令人满意。     

高效液相色谱-质谱联用法测定纺织品中的含氯苯酚

建立了高效液相色谱-质谱联用法检测纺织品中五氯苯酚(PCP)、四氯苯酚(TeCP)。选用ZORBAX XDB-C18柱(50 mm×2.1 mm,3.5μm)为分析柱,流动相为V(甲醇)∶V(纯水)=88∶12,流速为200μL/min;质谱条件选用气动辅助电喷雾离子源(ESI),检测方式为负离子多离子反应检测(MRM);PCP、TeCP标准曲线线性范围均为0.1~100μg/L;回收率为90%~99%;相对标准偏差为3.5%~7.6%(n=5);方法检测低限为5μg/kg。方法适用于纺织品中PCP、TeCP的测定。     

超高效液相色谱-串联质谱法测定鸡皮及脂肪组织中抗球虫类药物残留

建立了检测鸡的皮和脂肪中抗球虫类药物的超高效液相色谱-串联质谱分析方法。样品采用甲醇、乙腈、乙酸(4∶1∶0.05;V/V)混合溶液提取,提取液经Sep-Pak tC18固相萃取柱富集净化,在电喷雾正离子模式下,以多反应监测模式采集数据,进行定性与定量分析。结果表明,常山酮和氯苯胍的检出限均为7.0μg/kg,定量限为20μg/kg;盐霉素、莫能菌素、甲基盐霉素、马杜霉素和拉沙洛菌素的检出限均为5.0μg/kg,定量限为15.0μg/kg。本方法在15~200μg/kg添加浓度范围内的回收率为75%~110%,日内相对标准偏差≤12.8%,日间相对标准偏差≤13.4%。     

高效液相色谱法测定高纯度苯肼

建立了高纯度苯肼的高效液相色谱测定方法。在流动相中加入抗氧剂和色谱改性剂(M),很好解决了苯肼色谱峰拖尾问题,可准确测定高纯苯肼中杂质含量。优化条件是:Agilent hc-C18色谱柱(150×4.6mm,5μm);流动相为甲醇-水(体积比40∶60)其中所含抗氧剂、色谱改性剂(M)、K2HPO4-KH2PO4浓度均为0.02mol/L;流速1.0mL/min;进样量20μL;检测波长272nm。高纯苯肼中所含杂质苯胺、苯酚以及联苯胺,在5~120μg/mL范围内均具有良好的线性关系,相关系数r>0.9993。     

高效液相色谱-串联质谱法测定养殖环境沉积物中多肽类抗生素残留量

建立了测定水产养殖环境沉积物中多肽类抗生素残留量的高效液相色谱串联质谱法。沉积物经10 mL甲醇-柠檬酸-Na2 HPO4溶液(3∶4, V/ V)超声提取2次,0.5 g 乙二胺四乙酸二钠络合除杂,5 mL 甲基异丁基甲酮净化,HLB 固相萃取柱进一步富集净化,MGII C18色谱柱分离,0.1%甲酸与0.1%甲酸-乙腈梯度洗脱,ESI+电离,多反应监测模式(MRM)监测,外标法定量。粘菌素和杆菌肽在10~10000μg/ L 范围内,维吉尼霉素 M1在4~4000μg/ L 范围内,线性回归系数均大于0.999,方法检出限为2~5μg/ kg,方法定量限为4~10μg/ kg。在3个浓度添加水平下,多肽类抗生素回收率79.7%~91.6%,相对标准偏差1.9%~10.8%。本方法具有良好的精密度和准确度,灵敏度高,适用范围广。     

HPLC法测定浓缩当归丸中阿魏酸的含量

建立了浓缩当归丸中阿魏酸的HPLC测定方法.采用C18色谱柱(TSK-GEL,4.6×150 mm,5μm),以甲醇-水-磷酸(30∶70∶0.3,V/V/V)为流动相,流速1.0 mL/min,检测波长320 nm.结果阿魏酸在0.006~0.15μg范围内线性关系良好,r为0.9999,平均加样回收率为96.91%.本方法可用于浓缩当归丸中阿魏酸的含量监控.     

高效液相色谱-荧光检测法测定人体尿液中的蝶呤-6-羧酸

利用蝶呤-6-羧酸具有天然荧光的特点,建立了人体尿液中蝶呤-6-羧酸的高效液相色谱-荧光分析方法。尿液经硫酸铵处理后,过0.45μm水相滤膜,直接进行液相色谱分析,色谱柱为NOVA-PAK C18柱,保护柱为RCSS Guard-PAKTMC18柱,流动相为V(5 mmol/L KH2P04-NaOH缓冲溶液,pH 7.3)∶V(甲醇)=99∶1),流速为0.6 mL/min,荧光激发波长为338 nm,荧光发射波长为420nm。蝶呤-6-羧酸在0.05~1.2μg/mL范围内呈线性关系,相关系数为0.9974,检出限为0.010μg/mL。分别添加0.625、2.50和4.50μg蝶呤-6-羧酸标准品,平均回收率(n=5)在99.7%~105%之间,相对标准偏差小于3.6%。此法可用于临床尿样中蝶呤-6-羧酸的分析。     

用制备型高效液相色谱分离石油亚砜的馏分

用经典硅胶柱色谱法对石油亚砜 (PSO)进行预分离。PSO被分成 4个馏分 (分别记为PSO1,PSO2 ,PSO3和PSO4)。所用的流动相及洗脱顺序 :苯、二氯甲烷、甲醇 二氯甲烷 (1∶1体积比 )、甲醇。经预分离后 ,PSO中的亚砜成分主要富集在馏分PSO3和PSO2中。用高效制备液相色谱法对这两馏分作进一步的分离和纯化。PSO2的色谱条件是 :色谱柱 μ BondapakC1 85 7mm× 30 0mm ;流动相为二氯甲烷、环己烷、甲醇混合液 ,收集经纯化后的组分PSO2g2 2 ;PSO3被分离为 7个馏分 ,其色谱条件为 :色谱柱μ BondapakC1 85 7mm× 30 0mm ;流动相为 70 %～ 10 0 %甲醇 水 ;梯度洗脱其流量为 80mL min ;进样量为80mL 次 (PSO3用 70 %甲醇 水稀释 10倍 )。取其中较纯的馏分PSO3c ,PSO3e ,PSO3g作进一步的色谱纯化 ,色谱条件为C1 8半制备色谱柱 7.8mm× 30 0mm ;流速 :2 0mL min ;流动相 :甲醇 水 70∶ 30 ,V/V(PSO3c)″80∶2 0 ,V V(PSO3e) ;85∶15 ,V V(PSO3g) ;检测器UV 2 5 4nm     

高效液相色谱-串联质谱法测定人血浆和尿液中记忆丧失性贝毒软骨藻酸

建立了高效液相色谱-串联三重四极杆质谱法(HPLC-MS/MS)测定人血浆及尿液中记忆丧失性贝毒软骨藻酸。人血浆及尿液样品加入6倍体积甲醇沉淀剂,涡旋离心后,取上清液进样测定。色谱柱为Zorbax SB C18柱(150×4.6mm,5μm),柱温30℃;流动相为乙腈-0.1%甲酸水溶液(13∶87,V/V),流速为1.0mL/min。该方法检测血浆和尿液中软骨藻酸的线性范围均为1.8~115μg/L,相关系数r=0.999,检出限为0.9μg/L,定量下限为1.8μg/L。该方法具有操作方便、专属性强、灵敏度高的特点,适用于人体血浆及尿液中软骨藻酸的测定。     

离子液体选择性萃取生物产品

Imidazolium based room temperature ionic liquids have been used to extract selectively L-tryptophan from fermentation broth. BF4 anion was found to enhance dramatically the partitioning of L-tryptophan into ionic liquid phase from aqueous solutions.     

Speciation and Determination of Trace Amount of Inorganic Arsenic in Water,Environmental and Biological Samples

A new speciation and preconcentration method based on dispersive liquid‐liquid microextraction has been developed for trace amounts of As(III) and As(V) in urine and water samples. At pH 4, As(III) is complexed with ammoniumpyrrolidine dithiocarbamate and extracted into 1‐Hexyl‐3‐methylimidazolium hexafluorophosphate, as an ionic liquid (IL) and As(III) is determined by electrothermal atomic absorption spectrometery (ETAAS). Arsenic(V) in the mixing solution containing As(III) and As(V) was reduced by using KI and ascorbic acid in HCl solution and then the procedure was applied to determination of total arsenic. Arsenic(V) was calculated as the difference between the total arsenic content and As(III) content. The effect of various parameters on the recovery of the arsenic ions has been studied. Under the optimum conditions, the enrichment factor 135 was obtained. The proposed method was successfully applied to the determination of trace amounts of As(III) and As(V) in water and biological samples.     

The Phosporylation of Aniline Derivatives in Biphase Systems

Aniline derivatives were phosphorylated in biphase systems using three methods. A comparative study was performed. The best results were obtained when a solid–liquid system was used. This method is the easiest and lead to higher yields (54–81%).     

液体聚异戊二烯的合成与应用研究进展

固态橡胶具有较高的分子量、强度及伸长率,在工业和日常生活中均得到广泛应用.然而,固态橡胶黏度较高,在应用中往往必须引入添加剂.而液体聚异戊二烯是一种液态橡胶,可以作为固态橡胶的软化剂;得益于其特殊的形态和性能,液体聚异戊二烯可望在多方面得到应用.对液体聚异戊二烯的合成与应用进行了评述.     

有机硅侧链液晶研究进展

综述了国内外有机硅侧链液晶近年来的研究进展，对近晶型、席夫碱型、向列型、胆甾型、偶氮苯型、鱼骨型以及光学非线性型几种主要类型的有机硅侧链液晶进行了详细介绍，并对近年来受到重视的有机硅侧链液晶电流性和离聚物研究进展作了较全面的总结，最后对其应用前景进行了展望。     

水样中氟罗沙星和磺胺喹噁啉的离子液体均匀提取

提出一种新的离子液体均匀提取方法,即向水样中加入可溶于水的离子液体1-己基-3-甲基咪唑四氟硼酸盐([C6MimBF4]),再加入过量六氟磷酸铵(NH4PF6),形成不溶于水的离子液体1-己基-3-甲基咪唑六氟磷酸盐([C6MimPF6]),水样中的氟罗沙星和磺胺喹噁啉被提取到[C6MimPF6]相,离心分离后,离子液体可直接用于HPLC分析.本法测得的氟罗沙星和磺胺喹噁啉的检出限分别为1.8和1.1μg/L.     

Combination of ionic liquid dispersive liquid-phase microextraction and high performance liquid chromatography for the determination of triazine herbicides in water samples

A temperature-controlled ionic liquid dispersive liquid-phase microextraction in combination with high performance liquid chromatography was developed for the enrichment and determination of triazine herbicides such as cyanazine,simazine,and atrazine in water samples.1-Octyl-3-methylimidazolium hexafluorophosphate([C8MIM][PF6]) was selected as the extraction solvent.Several experimental parameters were optimized.Under the optimal conditions,the linear range for cyanazine was in the concentration range of 0.5–80 mg/L and the linear range for simazine and atrazine was in the range of1.0–100 mg/L.The limit of detection(LOD,S/N = 3) was in the ranges of 0.05–0.06 mg/L,and the intra day and inter day precision(RSDs,n = 6) was in the ranges of 3.2%–6.6% and 4.8%–8.9%,respectively.Four real water samples were analyzed with the developed method,and the experimental results showed that the spiked recoveries were satisfactory.All these exhibited that the developed method was a valuable tool for monitoring such pollutants.     

新的手性Schiff碱液晶的合成及变温红外光谱研究(Ⅰ)

合成了1个新的手性Schiff碱类液晶并以DSC、偏光显微镜及变温红外光谱等手段对其热致相变过程进行了研究。     

几类非常规液晶材料的研究进展

本文综述了液晶二聚体、多爪型液晶及香蕉形液晶等几类非常规液晶材料的研究进展。结合笔者近几年的研究积累,着重介绍:(1)液晶二聚体的分子结构与液晶态结构及液晶二聚体所特有的奇偶效应与近晶多形性;(2)多爪型液晶的分子结构与液晶态结构的特点及由于兼有棒状分子与盘状分子的结构特点而具备的特殊的相变性质;(3)香蕉形液晶的分子结构与液晶态结构及香蕉形液晶所特有的手性与极化序。在介绍各类液晶材料的特点及研究热点的同时,围绕分子结构与液晶态结构的关系这一主题,深入讨论了各种液晶材料形成特殊分子排列及表现出特殊物理性质的机理。     

Applications of multidirectional reflective light-control films on reflective polymer-dispersed liquid crystal displays for enhancement in image quality at lower viewing angles

In this paper, multidirectional light-control reflective (LCR) films are developed in order to create an active reflective structure that will enhance the image brightness and contrast ratio of reflective dye-doped polymer-dispersed liquid crystal (D-PDLC) displays at lower viewing angles. Advantages of LCR films are that their production is low cost and they require a simple photolithographic fabrication method. The optimum design prism-type light-control reflective film succeeded in minimising the surface scattering effect; thus, the contrast ratio is much enhanced. The symmetric and asymmetric LCR films produced multidirectional scattering that enhances the reflectance at lower viewing angles, which has importance in future display applications. In particular, the prism LCR film has been found to be more influential on the reflectance of D-PDLC films due to multidirectional scattering of light by non-symmetric arrays. The improvement in contrast ratio has been confirmed by the enhancement of optical properties for reflective D-PDLC displays at lower viewing angles below 30°.