基于离子液体的分散液液微萃取-柱前荧光衍生高效液相色谱法测定水样中8种磺胺类药物

建立了一种基于离子液体的分散液液微萃取技术结合柱前荧光衍生高效液相色谱(IL-DLLME-HPLC-FL)对8种磺胺类药物进行检测的方法,并成功应用于实际环境水样的分析。实验考察了萃取参数对磺胺萃取效率的影响及衍生产物的稳定性。最佳实验条件:以40 μL [C₆MIM]PF₆]为萃取剂,0.1 mL丙酮为分散剂,对pH=4且不含NaCl的水溶液进行不超声的分散液液微萃取,并衍生化反应6 h。结果表明:在最佳实验条件下,该法在0.2~10 μg/L和10~500 μg/L两个浓度范围内线性良好,线性相关系数r ≥0.9989;检出限为0.08~0.5 μg/L (S/N=3)。对实验室自来水、湖水、珠江水、池塘水分别加标5、50、200 μg/L的回收率为87.2%~101.4%,相对标准偏差为3.7%~6.2%。该法环保、简便,可用于测定实际水样中磺胺类药物。     

RP-HPLC法测定水体表层沉积物中的磺胺类与四环素类抗生素

建立了超声提取-固相萃取/反相高效液相色谱检测水体表层沉积物中磺胺类和四环素类抗生素含量的方法。沉积物样品经冷冻干燥后用甲醇-EDTA/Mc Ilvaine缓冲液(1∶1)超声萃取,于40℃下氮气吹除提取液中有机溶剂后,过Poly-Sery HLB固相萃取小柱净化萃取,以ODS-P C_(18)反相色谱柱、紫外检测器进行色谱分析。结果表明:7种磺胺类抗生素在0.025~0.5 mg/L浓度范围内线性关系良好,相关系数(r2)均大于0.999,3个加标水平下的回收率为71.4%~107.6%,相对标准偏差(RSD,n=3)为1.4%~5.2%,方法检出限(MDL)为0.07~0.29 ng/g;3种四环素类抗生素在0.05~1 mg/L浓度范围内线性关系良好,r~2均大于0.999,3个加标水平下的回收率为62.2%~87.9%,RSD(n=3)为1.1%~4.6%,MDL为0.45~0.58ng/g。应用此方法对某城市湖泊及其引水河道表层沉积物进行检测,10种目标抗生素均被检出。该方法简单快速、精确可靠,适用于水体沉积物中磺胺类和四环素类抗生素的检测。     

UPLC-MS法同时测定牛奶中磺胺类、喹诺酮类、甾体激素类及四环素类兽药残留

建立并优化了同时测定牛奶中10种磺胺类、6种喹诺酮类、8种甾体激素类以及1种四环素类药物共25种兽药残留的超高效液相色谱-串联质谱检测方法。样品中目标药物经5%乙酸乙腈提取,HLB固相萃取小柱净化后,通过UPLC-MS测定,外标法定量。25种兽药在不同加标浓度下的回收率为61.6%~119.2%,组内相对标准偏差(RSD)为2.5%~13.4%,组间RSD为5.8%~14.2%,方法检出限为0.5~2.0μg/kg。     

Nanometre-sized Macrocyclic Oligoamides by Iterative Synthesis

New nanometre-sized macrocyclictosylaza[3_n]paracyclophanes have been synthesized bymeans of an iterative synthetic strategy using linearbuilding blocks with up to four benzene units. Theformation of the open-chain difunctionalized linearmolecules was achieved by a three step reactionsequence including nucleophilic substitution andtransformation of the terminal ester groups to thecorresponding dialcohol and dibromide. The finalintermolecular macrocyclizations were carried out byreaction of open chained dibromides andbis(tosylamides) to obtain nanosize macrocyclicoligotosylamides in 31–50% yield. Highly symmetricaltosylaza[3_n]paracyclophanes containing up to sevenbenzene units and up to 49 ring members (n = 5–7) wereobtained. Also described is the preparation of30–90-membered paracyclophanes containing biphenyl orterphenyl units.     

高效液相色谱-电喷雾串联质谱法同时测定鸡肉中残留的磺胺类和氟喹诺酮类兽药

建立了一种同时测定鸡肉中两类共10种兽药(3种磺胺和7种氟喹诺酮类药物)残留量的高效液相色谱-电喷雾串联质谱方法(HPLC -ESI-MS2)。样品经2%醋酸-乙腈提取,正己烷脱脂,过ENVI-18固相萃取柱净化,经氮气吹干后,残余物用流动相定容到1 mL。以乙腈和 0.05%甲酸溶液作为流动相,采用梯度洗脱程序进行液相色谱分离,用质谱检测器进行定性和定量分析,并对10种药物的二级质谱碎裂方 式进行分析。10种药物在0.02～2.0 mg/L范围内线性良好,相关系数均大于0.9988。检出限(LOD)为1.10～6.85 μg/kg,定量限(LOQ) 为3.68～22.85 μg/kg,样品的平均加标回收率为68.9%～102.6%,相对标准偏差均小于8.6%(n=3)。实验结果表明,该方法灵敏度高,重 现性好,确证能力强,分析时间短,可满足动物源性食品中磺胺和氟喹诺酮类药物的残留分析。     

An Efficient Method for the Preparation of Sulfonamides from Sodium Sulfinates and Amines

Sulfonamides have a special role on medicine due to their broad biological activities, as bacterial infections, diabetes mellitus, oedema, hypertension prevention and treatment. In addition, sulfonamides are also useful in herbicides and pesticides. Herein, we communicate an efficient strategy for the preparation of sulfonamides via NH₄I‐mediated amination of sodium sulfinates. This new method provides a general and environmentally friendly access to sulfonamide compounds and tolerates a wide range of functional groups.     

Non-emissive RuII Polypyridyl Complexes as Efficient and Selective Photosensitizers for the Photooxidation of Benzylamines

Five new Ru^II polypyridyl complexes bearing N-(arylsulfonyl)-8-amidoquinolate ligands and three of their biscyclometalated Ir^III congeners have been prepared and employed as photocatalysts ( PC s) in the photooxidation of benzylamines with O₂. In particular, the new Ru^II complexes do not exhibit photoluminescence, rather they harvest visible light efficiently and are very stable in solution under irradiation with blue light. Their non-emissive behavior has been related to the low electrochemical energy gaps and rationalized on the basis of theoretical calculations (DFT analysis) that predict low S₀←T₁ energy values. Moreover, the Ru^II complexes, despite being non-emissive, display excellent activities in the selective photocatalytic transformation of benzylamines into the corresponding imines. The presence of an electron-withdrawing group (-CF3) on the arene ring of the N-(arylsulfonyl)-8-amidoquinolate ligand improves the photocatalytic activity of the corresponding photocatalyst. Furthermore, all the experimental evidence, including transient absorption spectroscopy measurements suggest that singlet oxygen is the actual oxidant. The Ir^III analogues are considerably more photosensitive and consequently less efficient photosensitizers ( PS s).     

两步液液萃取-固相萃取净化结合高效液相色谱-串联质谱法测定猪肉中11种磺胺类兽药残留

建立了猪肉中11种常见的磺胺类兽药残留的两步液液萃取-固相萃取净化-高效液相色谱-串联质谱（LC-MS/MS）检测方法。猪肉样品经乙酸乙酯（含2%（v/v）甲酸）及丙酮分两步液液萃取，正己烷脱脂，Oasis MCX混合阳离子固相萃取小柱净化，氮吹浓缩，定容，过滤膜后进行高效液相色谱-串联质谱分析。采用多反应监测正离子模式进行检测，以基质校准曲线外标法定量。结果表明，在20~400 μg/L范围内11种磺胺类药物均呈现良好的线性关系（相关系数（r²）≥ 0.99），检出限（LODs）（S/N=3）和定量限（LOQs）（S/N=10）分别为0.1~1.0 μg/kg和0.2~3.0 μg/kg。对阴性猪肉样品，在50、100、200 μg/kg 3个水平下分别进行加标回收试验，测得各待测物的平均回收率为79.3%~105.5%之间，相对标准偏差为1.3%~11.6%（n=6）。该方法比采用一步液液萃取法具有更高的提取效率，同时结合固相萃取净化方法进一步富集目标化合物，降低了基质干扰，提高了检测灵敏度。     

<Emphasis Type="Italic">O,O</Emphasis>-diphenyl <Emphasis Type="Italic">N</Emphasis>-sulfonylbenzimidoylphosphonates,a novel type of C-phosphorylated imines

A preparative method for the synthesis of first representatives of O,O-diphenyl N-sulfonylbenzimidoylphosphonates was proposed. The method involves oxidation of the corresponding α-(sulfonylamino)benzylphosphonates. The σ-constants of the N-sulfonylbenzimidoylphosphonate group were estimated by ¹⁹F NMR spectroscopy. The imidoylphosphonates obtained easily formed stable adducts at the C=N bond with P-and O-nucleophiles. Dedicated to the Corresponding Member of the Russian Academy of Sciences T. A. Mastryukova. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2567–2570, November, 2005.