简易氢化物发生-ICP-MS法测定高纯钴中痕量的砷

A method for the determination of trace arsenic in high purity cobalt with hydride generation-ICP-MS was reported. Due to the interference of the oxide complex ions ⁵⁹Co¹⁶O^＋, the background concentration of ⁷⁵As is about 100 µg•L^－1 in 1 g•L^－1 cobalt solution, which lead to the impossibility of the direct analysis for the trace As in high purity cobalt. However, the As background concentration can be decreased to several µg•L^－1 if the simple HG system was applied and the 0.05 µg•g^－1 of determination limits can obtained with this method.     

液相色谱-串联质谱同时测定牛奶中10种蛋白同化激素的残留

A liquid chromatographic/tandem mass spectrometric (LC/MS/MS) multiresidue method for the simultaneous determination of 10 anabolic steroids (ASs) in whole milk were developed. Milk samples were extracted with methanol and the samples were then subjected to a clean-up procedure using liquid-liquid extraction (LLE) methods. The samples were analysed by LC/MS/MS. The limits of detection (LOD) of LC/MS/MS method used for testing the 10 ASs in whole milk ranged from 0.06 to 0.22 µg•L^－1, and the limits of quantification (LOQ) were from 0.12 to 0.54 µg•L^－1. Experiments on spiked samples of whole milk showed that at addition levels of 1.0, 2.0, 10 µg•L^－1 the average recoveries of the ASs were 24% to 86%, 25% to 91%, 31% to 71%, with relative standard deviations (RSDs) ranged from 12% to 37%, 5% to 20%, 10% to 16%, respectively.     

液相色谱-串联质谱法测定玉米中伏马菌素B1

Fumonisin B1 in maize was determined by liquid chromatography/tandem mass spectrometry. The analysis was extracted from maize samples by acetonitrile-water-acetic acid 49:50:1(V/V/V). Raw extracts were evaporated to dryness and dissolved with mobile phase, chromatographyed on a C₁₈ column, and detection was performed on a triple quadrupole tandem mass spectrometry with electrospray ionization source. The method has a limit of quantification of 10 µg•kg^－1 in maize samples. The calibration curve is linear in the range of 1-500 µg•L^－1. The mean recovery ranges from 94 % to 104 %, and the relative standard derivations are lower than 9%. The method is sensitive and specific to be applied for determination of fumonisin B1 in maize samples.     

血液中曲马多的HPLC-MS/MS检验方法研究

The method for extraction and determination of tramadol was established by HPLC-MS/MS. Calibration curves are linear on injection of amounts range of 50-1 000 μg•L^－1. The limit of detection is 10 μg•L^－1, and the recovery is above 80% for Tramadol.     

应用液相色谱-质谱联用技术同时测定花生中的黄曲霉毒素B1、B2、G1、G2

The aflatoxin B1, B2, G1, G2 in peanut were develop by LC-MS/MS. The mass spectrometer was operated in the positive ion mode using multiple reaction monitoring. The sample was extracted with methanol, and chromatographic separation was carried out on a MGIII-C₁₈ column(2.1 mm×150 mm×1.8 μm) with eluthic sion of V(acetonitrile):V(water)＝35:65. The limit of detection is 0.5 μg•L^－1, the limit of quantitation is 0.5 μg•kg^－1. The linear plots are between 0.5 μg•L^－1 and 25.0 μg•L^－1. Overall recoveries are between 88.3% and 99.2%, and RSD values are between 1.73％ and 3.75％.     

液相色谱-串联质谱法测定牛奶中舒巴坦和他唑巴坦

A triple quadrupole liquid chromatography tandem mass spectrometry method is presented for the quantitative determination and confirmation of salbactam and tazobactam, the inhibitors of β-lactamase in milk. Milk was extracted with methanol, and the extracts were analyzed by LC-MS/MS in negative mode. The LOQs of salbactam and tazobactam in milk are 10 μg•L^－1 and 100 μg•L^－1, respectively.     

LC-MS/MS法定量测定人血浆中CPRC-127血药浓度

A sensitive liquid chromatography-electrospray ionization-tandem mass spectrometric(LC-MS/MS) method for the determination of CPRC-127 in human plasma was developed and validated. The plasma was extracted using a liquid-liquid phase extraction(LLE), and the sample extract was injected onto the LC-MS/MS system. The limit of quantitation(LLOQ) for CPRC-127 is 0.5 μg•L^－1. This method allows the reproducible and accurate quantification with the concentration range of 0.5-1 000 μg•L^－1. This method can be applied to the quantitation of CPRC-127 in human plasma.     

气相色谱-质谱法测定奶粉中的三聚氰胺

Melamine in milk power was determined by gas chromatography-mass spectrometer(GC/MS) made in china. The results show that the method has a good liner range between 0.005 mg•L^－1 and 2 mg•L^－1, R2 is 0.999 7. The limit of detection is 0.001 mg•L^－1, the quantitative detection limit is 0.02 mg•kg^－1. The recovery for melamine is in the range of 94％-102％. The method has good sensitivity, selectivity and repeatability, which has been applied to the determination of melamine in milk powder.     

解吸附-电喷雾离子化质谱方法快速检测啤酒中的甲基乙二醛

A desorption electrospray ionization mass spectrometry(DESI-MS) method was developed to determine methylglyoxal(MG) present in beers. This method utilized 1,2-diamino-4,5-dimethoxybenzene to convert MG to 6,7-dimethoxy-2-methylquinoxaline, and then determined the derivative by DESI-MS. 1×10^－5 mol•L^－1 MG in water and 5×10－5 mol•L^－1 MG in Yan Jing beer can be determined using this method. This time-saving method may provide a way for high-throughput analysis of MG in beverages.     

LC-MS/MS法定量测定人血浆中TF及其代谢产物M1，M2

A sensitive liquid chromatography-electrospray ionization-tandem mass spectrometric(LC-MS/MS) method for the simultaneous determination of TF and its metabolites M1 and M2 in human plasma were developed and validated. The plasma TF, M1, M2 were extracted using a solid phase extraction(SPE), and the sample extract was injected onto the LC-MS/MS system. The limits of quantitation(LLOQ) for TF, M1, M2 are 1 ng•L^－1. This method allowes the reproducible and accurate quantification with the concentration range of 1-500 ng•L^－1. This method can be applied to the quantitation of TF, M1, M2 in human plasma.