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51.
Clenbuterol hydrochloride (CLB) could catalyze NaIO4 oxidation of eosine Y (R), which caused the room temperature phosphorescence (RTP) signal of R to quench sharply. The ΔIP (=IP2 − IP1, IP2 was RTP intensities of reagent blank and IP1 was RTP intensities of test solution) of the system was directly proportional to the content of CLB. According to that academic thought, a new solid substrate-room temperature phosphorimetry (SS-RTP) for the determination of trace CLB has been established. This method has high sensitivity (detection limit (LD): 0.021 zg spot−1, corresponding concentration: 5.2 × 10−20 g mL−1) and good selectivity (Er = ±5%, interfering species were of no interference). It has been applied to the determination of residual CLB in the practical samples. The results were verified using HPLC and GC/MS methods. The reaction mechanism of catalytic SS-RTP for the determination of residual CLB was also discussed. 相似文献
52.
固相萃取-气相色谱法测定动物组织中盐酸克伦特罗残留量 总被引:1,自引:0,他引:1
建立了固相萃取-气相色谱分析动物组织中盐酸克伦特罗残留量的方法.采用固相萃取,分离富集动物组织中的盐酸克伦特罗.肉样的加标回收率在70%~80%;最低检出限为1μg/kg.盐酸克伦特罗的硅烷化衍生产物,采用气相色谱(ECD检测器)检测,其衍生物的峰面积与样品浓度在0.005~1.0μg/mL范围内呈良好的线性关系,线性回归系数大于0.999. 相似文献
53.
克伦特罗(clenduterol,C12H18Cl2N2O)属β兴奋剂类,俗称为瘦肉精,畜牧业上可作为生长促进剂,其药物残留对人类健康有危害,我国农业部将其列为食品动物禁止使用的兽药。对于动物组织、尿中盐酸克伦特罗残留的测定,一般是先用酶联免疫检测法进行筛选,由于酶联法存在假阳性问题,对检测结果呈阳性的样品需再用气相色谱-质谱法进行确汪检测。本文建立并验证了与酶联免疫检测法相配套使用的猪尿和猪肝中克伦特罗残留的GC-MS确证方法,并对来自全国抽检的猪肝样和尿样中的酶联阳性样品进行了确证检测,结果报道如下。 相似文献
54.
Quantification of Clenbuterol in Human Plasma and Urine by Liquid Chromatography-Tandem Mass Spectrometry 总被引:1,自引:0,他引:1
The quantitative determination of clenbuterol in human plasma and urine is of particular interest for various fields such
as clinical and forensic research and doping controls. A simple and rapid sample preparation procedure based on liquid-liquid
extraction with subsequent re-extraction followed by liquid chromatography and electrospray ionization tandem mass spectrometry
allowed the determination of clenbuterol in urine and plasma at detection and quantification limits of 0.1 ng mL−1 and 0.2 ng mL−1, respectively, with recoveries ranging from 85–96%. The fast and robust nature of the assay provides a rapid and cost-effective
alternative to established procedures utilizing solid-phase extraction strategies. 相似文献
55.
采用一步键合法制备了烯丙胺-β-环糊精/Cu_2O(Ally-β-CD/Cu_2O)毛细管电色谱整体柱,并考察了制备整体柱的主要影响因素。通过扫描电子显微镜(SEM)、X-射线光电子能谱(XPS)、X-射线衍射(XRD)对整体柱柱内固定相进行表征。以硫脲为中性标记物测定了柱效,柱效达到47 658 N/m。对D,L-组氨酸对映体的分离度RS达到3.82,整体柱在连续使用72h或间歇使用2个月后仍具有良好的分离能力,表明整体柱具有良好的重现性和稳定性,同时具备较好的手性拆分能力。运用该整体柱对盐酸克伦特罗对映体进行了拆分,达到基线分离,分离度达到2.89。 相似文献
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以羟丙基-β-环糊精(HP-β-CD)作为手性添加剂,采用毛细管区带电泳(CZE)成功分离了克伦特罗(Clenbuterol,Cle)对映体.研究了β-CD种类与浓度,缓冲液pH值及浓度,操作温度等对分离的影响.结果表明,以30 mmol/L的HP-β-CD为手性添加剂,50 mmol/L的磷酸盐缓冲溶液(pH 2.5)为缓中液,分离电压24 kV,操作温度20℃,可使Cle对映体实现基线分离,其分离度为6.78.对拆分机理也进行了探讨,测定了HP-β-CD与两对映体的结合常数及热力学参数;对CZE定量能力(线性,精度)进行了考察,R和S型的线性相关系数都大于0.998,两者的相对标准偏差(RSD)均低于2.2%. 相似文献
58.
Summary A method is described for the extraction of clebuterol from bovine retina samples by diphasic dialysis using gas chromatography—mass
spectrometry (GC-MS) as the procedure of determination. Following chemical digestion of retinal tissue in alkaline medium
at 80°C, clenbuterol is extracted by diphasic dialysis using diethyl ether as solvent at 37°C, for 4 h at 150 rpm. Diethyl
ether is evaporated to dryness and clenbuterol determined by GC-MS after butylboronic acid (BBA) derivatization. A detection
limit of 2.5 ng g−1, repeatability of 9.0% and reproducibility of 22.9%, with recoveries always >86% (n=5), are achieved as validation criteria. 相似文献
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建立了测定盐酸克仑特罗片剂含量的高效液相色谱法。选用Agilent Eclipse XDB-C8柱(4.6 mm×250 mm,5μm),流动相为甲醇-水(40∶60,含20 mmol.L-1磷酸二氢钾,以磷酸调至pH 4.0),流速为1.0 mL.min-1,检测波长240 nm,线性范围为0.50~50.0 mg.L-1(r=0.999 9),检出限为0.5 ng,回收率在98.5~102.0%之间,RSD为2.06%~3.07%(n=5)。 相似文献