高效液相色谱-串联质谱法测定兽药粉剂中18种磺胺类违禁添加药物

建立了非磺胺类兽药粉剂中磺胺二甲嘧啶、磺胺醋酰、磺胺甲噻二唑、磺胺氯哒嗪、磺胺甲基异唑、磺胺噻唑、磺胺-6-甲氧嘧啶、磺胺甲基嘧啶、磺胺邻二甲氧嘧啶、磺胺吡啶、磺胺对甲氧嘧啶、磺胺甲氧哒嗪、磺胺苯吡唑、磺胺间二甲氧嘧啶、磺胺二甲异唑、磺胺喹啉、磺胺嘧啶、甲氧苄氨嘧啶18种磺胺及其增效剂等违禁添加药物的超高效液相色谱-串联质谱分析方法。样品经甲醇-水(90∶10)萃取后,以乙腈(含0.1%甲酸)和水(含0.1%甲酸)为流动相,C18(2.1 mm×150 mm,5μm)色谱柱分离后,在正离子模式下以电喷雾串联质谱仪进行测定。方法的线性范围为50~2 000μg/kg,18种磺胺类药物残留的检出限为10μg/kg。在50,200,1 000μg/kg 3个浓度水平下进行加标回收实验,平均回收率为86.8%~115%,相对标准偏差为1.0%~9.7%。     

牛奶中12种磺胺类药物残留的高效液相色谱测定方法

建立了高效液相色谱(HPLC)检测牛奶中12种磺胺类药物(磺胺二甲基嘧啶、磺胺间甲氧嘧啶、磺胺甲噁唑、磺胺对甲氧嘧啶、磺胺喹噁啉、磺胺氯哒嗪、磺胺氯吡嗪、磺胺嘧啶、磺胺噻唑、磺胺甲基嘧啶、磺胺甲噻二唑、磺胺地索辛)残留的方法,考察了样品的提取、净化及色谱分析条件。牛奶样经乙酸乙酯提取、固相萃取净化后上机分析,11种磺胺药物标准曲线在10~800μg/L,SM2在5~200μg/L质量浓度范围内相关系数r>0.999,回收率为76%~106%,相对标准偏差小于15.9%。检出限为5~8μg/L,定量下限为14~27μg/L。     

液相色谱-串联质谱同时测定家禽组织中16种磺胺残留

5g家禽组织样品,用乙腈提取,旋转蒸发器减压蒸干后,用乙腈0．01mol／L乙酸铵溶液溶解（12：88,V/V）,用正己烷去除脂肪后,样液用高效液相色谱分离,电喷雾串联四级杆质谱进行检测,外标法定量。本方法研究的16种磺胺（磺胺甲噻二唑、磺胺醋酰、磺胺嘧啶、磺胺氯哒嗪、磺胺甲基异唔唑、磺胺甲基嘧啶、磺胺吡啶、磺胺二甲异嘌唑、磺胺-6-甲氧嘧啶、磺胺邻二甲氧嘧啶、磺胺甲氧哒嗪、磺胺间二甲氧嘧啶、磺胺噻唑、磺胺二甲嘧啶、磺胺甲氧嘧啶、磺胺苯吡唑）的线性范围为0．2—120ng,线性相关系数r〉0．995;在2．5—600μg/kg的4个添加水平范围内的平均回收率为75．4％-97．3％;相对标准偏差为3．48％-14．09％;方法检出限（LOD）为1．0—12．0μg／kg;方法定量限（LOQ）为2．0—24．0μg/kg。     

超高效液相色谱-四极杆飞行时间质谱法快速筛查生鲜牛乳中的14种磺胺类药物

采用超高效液相色谱-四极杆飞行时间高分辨质谱(UHPLC-Q TOF MS)技术建立了生鲜牛乳中14种磺胺类药物(磺胺二甲嘧啶、磺胺嘧啶、磺胺二甲氧嘧啶、磺胺噻唑、磺胺吡啶、磺胺氯哒嗪、磺胺甲嘧啶、磺胺醋酰、磺胺曲沙唑、磺胺苯吡唑、磺胺苯酰、磺胺甲噻二唑、磺胺甲氧哒嗪、磺胺甲唑)的快速筛查方法。建立了此14种化合物的精确分子质量数和二级质谱碎片离子数据库。牛乳样品经含0.1%甲酸的乙腈溶液提取,采用Qu ECh ERS方法净化。目标药物经Agilent ZORBAX SB C18色谱柱(3.0 mm×100 mm,1.8μm)分离,以乙腈-0.1%甲酸水溶液为流动相进行梯度洗脱,使用Dual AJS ESI源,在正离子模式下进行数据采集,可在8 min内实现对14种磺胺类药物的良好分离。结果表明,14种磺胺类药物的定量下限(LOQ,S/N=10)为10μg/kg,在10,20,50μg/kg 3个加标水平下的平均回收率为72.5%~117.1%,相对标准偏差为1.3%~10.9%。结合精确分子质量数、保留时间、同位素丰度和二级特征碎片离子对目标化合物进行快速筛查与确证。该方法快速简便、准确、灵敏度较高,适用于牛乳中磺胺类药物残留的高通量筛查与定性鉴定。     

规模化养殖场废水中抗生素种类及残留特征研究

2010年调查了海南省6家规模化养猪场抗生素使用品种及来源,并采集养殖废水样品,用高效液相色谱紫外检测器检测了样品中4种四环素(四环素、土霉素、金霉素和强力霉素)和8种磺胺类药物(磺胺嘧啶、磺胺甲噻唑、磺胺噻唑、磺胺二甲基嘧啶、磺胺氯哒嗪、磺胺邻二甲氧嘧啶、磺胺间二甲氧嘧啶和磺胺喹恶啉)的残留浓度水平。结果显示,6家养殖场废水中土霉素、四环素和磺胺嘧啶的检出率及检出浓度较高,其中土霉素检出率为100%,最高浓度为71.75μg/L;四环素检出率为63%,最高检出浓度为24.83μg/L;磺胺嘧啶检出率为83%,最高检出浓度为17.69μg/L。4种四环素类检出总量变化范围为18.25～99.64μg/L,8种磺胺类检出总量变化范围为3.45～24.49μg/L;从养殖规模上看,小规模养殖场抗生素类检出品种较多,检出浓度也较高。     

饲料中八种磺胺药物的高效液相色谱测定

结合液、液分配和固相萃取,建立了同时分析食用动物饲料中磺胺嘧啶、磺胺甲基嘧啶、磺胺二甲嘧啶、磺胺甲氧哒嗪、磺胺甲基异唑、磺胺间甲氧嘧啶、磺胺间二甲氧嘧啶和磺胺喹啉8种磺胺类药物的高效液相色谱方法。比较和优化了不同的提取方法和净化参数,方法对饲料中磺胺的检出限为0.20×10-6(w),八种磺胺添加水平为1×10-6(w)时,回收率在68%以上,相对标准偏差小于12%。     

UPLC法检测渔用饲料中八种磺胺类药物残留的研究

本文通过对多组样品的试验测定,建立了一种渔用饲料中8种常用磺胺(磺胺嘧啶、磺胺甲基嘧啶、磺胺二甲基嘧啶、磺胺噻唑、磺胺甲基异噁唑、磺胺多辛、磺胺异噁唑和磺胺喹噁啉)的超高效液相色谱检测法。具体是:样品经2%乙酸浸润,4℃预冷的乙腈提取,碱性氧化铝柱净化,用Symmetry-C18色谱柱(5μm,4.6×150mm),2%乙酸-甲醇梯度洗脱,紫外检测,检测波长270nm。结果表明,8种磺胺的定量底限为2mg/kg,在0.5~20μg/m L内,线性关系良好,R20.99。添加水平10mg/kg时,8种磺胺类药物的平均回收率范围为70%~100%,RSD15。该方法回收率高,简单,准确可靠,可用于渔用饲料中磺胺类药物残留的监测。     

超高效液相色谱法检测化妆品中的12种磺胺抗生素

建立了采用超高效液相色谱(UPLC)-二极管阵列检测器（PDA）测定化妆品中12种常见的磺胺抗生素(磺胺、磺胺间甲氧嘧啶、磺胺醋酰、磺胺甲基异唑、磺胺嘧啶、磺胺二甲异唑、磺胺噻唑、磺胺二甲氧嘧啶、磺胺甲基嘧啶、磺胺喹啉、磺胺二甲嘧啶、磺胺硝苯)的方法。采用Acquity UPLCTM BEHC C18 色谱柱(50 mm×2.1 mm, 1.7 μm),流动相为乙腈/0.1%的甲酸水溶液,梯度洗脱。样品经提取、反萃取后,用UPLC-PDA进行分析检测,结合保留时间和紫外光谱进行定性分析,定量检测波长268 nm。12种磺胺的检出限(S/N=3)均为1 μg/g,定量下限(S/N=10)为2～3 μg/g,在1～25 mg/L(磺胺硝苯为0.5～12.5 mg/L)范围内,峰面积和质量浓度的线性关系良好(r>0.9997)。添加水平为40, 8 μg(磺胺硝苯为20, 4 μg)时,12种磺胺的平均回收率分别为86.8%～98.1%和80.1%～96.9%,相对标准偏差小于10%(n=6)。结果表明该方法简单,分离效果好,速度快,能够满足检测化妆品中12种常见的磺胺抗生素的需要。     

硅胶固载离子液体-基质固相分散/高效液相色谱法测定禽肉与肝脏中8种磺胺类药物残留

以硅胶固载离子液体作为分散剂,采用基质固相分散法萃取/高效液相色谱法检测禽肉和肝脏样品中的8种磺胺类化合物(磺胺二甲基嘧啶、磺胺噻唑、磺胺-6-甲氧嘧啶钠、磺胺氯哒嗪、磺胺异唑、磺胺二甲氧嘧啶、磺胺苯吡唑、磺胺硝苯)。基质固相分散最佳提取条件为:含12%1-己基-3-甲基咪唑六氟磷酸盐([Hmim]PF6)的硅胶固载离子液体为分散剂,石油醚为淋洗剂,甲醇为洗脱剂,样品与分散剂的质量比为1∶4。8种磺胺类药物在25~1 000μg/kg范围内线性关系良好(r≥0.997 4),检出限和定量下限分别为4.4~7.6μg/kg和14.7~25.3μg/kg,加标回收率和相对标准偏差分别为66.2%~98.7%和1.4%~9.0%。与其他方法相比,本法的样品用量少,操作简单,目标物的检出限和定量下限低,完全可用于禽类产品中磺胺类药物残留量的检测。     

同步荧光法测定复方新诺明中磺胺甲基异噁唑和甲氧苄氨嘧啶的含量研究

本文采用同步荧光技术对复方新诺明中有效成份磺胺甲基异噁唑和甲氧苄氨嘧啶进行测定,在△λ分别为72nm和94nm的条件下,测定样品中所含有效成份相当于标示量的95.12％～105.68％;回收率为95.5％～98.1％;线性范围磺胺甲基异噁唑为0.125～4.00μg/ml。甲氧苄氨嘧啶为0.125～3.00μg/ml;相关系数分别为0.9976和0.9978.不经分离和掩蔽直接连续测定,效果良好。     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.