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Determination of Sulfadiazine Residues in Pork by Molecular Imprinted Column Coupling with High Performance Liquid Chromatography

Yunhong HUANG ; Yang XU ; Bibai DU ; Qinghua HE ; Yusheng CAO

Chinese Journal of Analytical Chemistry.2012;40(7):1011-1018. doi:10.1016/S1872-2040(11)60558-6

A method for the quantitative monitoring of sulfadiazine (SD) residues in pork was established by molecular imprinted column coupling with high performance liquid chromatography (HPLC).The molecular imprinted column was selected as an extraction device.To obtain the optimum extraction efficiency,several parameters related to the molecular imprinted column,including column solvent,flow-rate,eluent of the sample matrix and eluent volume,were investigated.The sample solution was directly injected into the device for the extraction after simple extraction.Under the optimum conditions,the relative standard deviations (RSD) was ≤6.1％ and the recoveries for SD were higher than 75.6％.In comparison with the AL-SPE column,the MIP-SPE column had good reusability and extraction efficiency.This method was successfully applied to the determination snlfadiazine residues in pork.

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Analysis of Volatile Components in Phellodendron Chinense Schneid

Rihua HUI ; Dongyan HOU ; Tiechun LI ; Jieli ZHANG

Chinese Journal of Analytical Chemistry.2001;29(3):361-364.

Simultaneous distillation-extractor was used for extracting the volatile substances in Phellodendron chinense Schneid.41 Volatile components were identified by gas chromatography/mass spectrometry (GC/MS) method. Of them the main components are ketones(16.38%),aldehydes(13.94%),alcohols(8.27%),phenols(50.38%),esters(3.02%),acids(2.18%).The content of the 41 identified compounds makes up 97.50% of the total volatile substances detected

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Application and Development of Catalytic Fluorimetry

Bo TANG ; Fang HAN ; Li MA

Chinese Journal of Analytical Chemistry.2001;29(3):347-354.

The application and development of catalytic fluorimetry in recent years were reviewed with 103 references. The new technique and application of catalytic fluorimetric methods, such as the determination of catalyst and activator, multicomponent determination, enzyme catalysis, the effect of micelle in multicomponent determination and enzyme catalysis, the combination with flow-injection or stopped-flow tachniques and laser induced fluorimetry, time resolved fluorimetry, bioreactor control, biosensor, medicine assay, bioanalysis were mainly discussed. Future study was envisioned

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The Application of Surfactants in Micelle Electrokinetic Chromatography

Weibing ZHANG ; Jianhui XIONG ; Guowang XU ; Yuku ZHANG

Chinese Journal of Analytical Chemistry.2001;29(3):342-346.

The application of surfactants in micelle electrokinetic chromatography is reviewed with 56 references, including the characteristic and application scope of the different types of surfactants and mixed surfactant micelle systems. The optimization strategy on the concentration of surfactants in separation is also discussed.

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Flow Injection-Catalytic Spectrophotometric Determinationof Trace Phenols Using Stopped-Flow Technique

Yahong CHEN ; Jing FAN ; Cunling YE ; Suling FENG

Chinese Journal of Analytical Chemistry.2001;29(3):339-341.

A rapid and simple flow-injection-catalytic spectrophotometric method using stopped-flow technique for determination of trace phenols is described. This methods is based on the catalytic effect of phenols on the reaction of rhodamine B and potassium bromate in sulfuric acid medium. The optimal experimental conditions are obtained by using the controlled and weighed centroid simplex method. The linear range of the determination is 0.60～4．00 mg/L for phenols, and the detection limit is 0.1 mg/L with the sample throughput of 34/h. The relative standard deviation of eleven replicate measurements is less than 2.0%. It has been applied for the determiantion of phenols in waste water with satisfactory results

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Resolution of Optical Isomers of α-Hydroxy-acetones byHigh Resolution Gas Chromatography on Chiral Stationary Phase

Yueqin ZHANG ; Xueyan SHI ; Ruonong FU ; Hanbang ZHANG ; Yun LING ; Xiaobin ZUO ; Hanfan LIU

Chinese Journal of Analytical Chemistry.2001;29(3):336-338.

Using the cyclodextrin bonded polysiloxane (bikis〔（2,6-di-O-pentyl-3-O-hex-6-O-enyl)-pentakis(2,6-di-O-pentyl-3-O-methyl)-β-cyclodextrm-polysiloxane〕) as gas chromatographic stationary phase, α-hydroxy acetones were separated and the values of the enantiomeric excess(e.e) of 3-hydroxy-2-butanone were determined. The results showed that the high resolution gas chromatography (HRGC) using the chiral gas chromatographic stationary phase could determine the productive rate of the asymmetric hydrogenaton reaction and evaluate the enantoselectivity of the catalyst system.

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Flow Injection Analysis of Tannic Acid withEnhanced Chemiluminescent Detection

Shifeng LI ; Hua CUI ; Yugang SUN ; Xiangqin LIN

Chinese Journal of Analytical Chemistry.2001;29(3):333-335.

A novel flow injection chemiluminescent enhancement method for the determination of tannic acid based on luminol-KIO4-Mn2＋ system is developed. The method is simple, rapid and effective to determine tannic acid in the range of 3.0×10－8～5.0×10－6 mol/L with a detection limit of 9×10－9 mol/L. The relative standard deviation is 1.5% for the determination of 1.0×10－6 mol/L tannic acid (n=11). The mehtod has been applied to determine the content of tannic acid in Chinese gall with satisfactory results.

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Correlativity of Retention Indices of Gas Chromatographywith a New Topological Indices 0X（1X）

Xihua DU ; Changjun FENG

Chinese Journal of Analytical Chemistry.2001;29(3):330-332.

Based on the adjacent matrix, a new principal quantum number topological index mX was set up：0X=Σ(δi)0.5， 1X=Σ(δi*δ\-j)0.5. The 0X, 1X values of 94 molecules for 13 series of compounds are calculated. It is found that 0X, 1X are correlated well with the retention indices RI of gas chromatography for these compounds .The results show that all the correlation coefficients are larger than 0.97. It has been demonstrated that the method possesses the advantage of easy computation and clear physical significance.

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Study on the Metabolites of Brodimoprim in Rat Plasma with1H Nuclear Magnetic Resonance and Mass Spectroscopy

Chun YANG ; Shouren ZHANG ; Ruiming XU ; Man KONG ; Wenyi HE ; Yikang SI

Chinese Journal of Analytical Chemistry.2001;29(3):327-329.

The methods of 1H Nuclear Magnetic Resonance (NMR) and mass spectroscopy were used in detecting the metabolites of brodimoprim (BDP) in rat plasma. The endogenic compounds in the plasma were removed with solid phase extraction (SPE) column firstly, then the mixture of metabolites was identified with 1H NMR and mass spectroscopy (MS). Two metabolites of BDP in the plasma at 20h were detected, they were demethyl-brodimorpim glucuronide and brodimoprim sulfurate. The study proved that the method of SPE coupled with NMR and MS can be applied to the analysis of metbolites in plasma quickly and conveniently.

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Spectrophotometric Determination of Iodide with 〔I2Br〕--BasicTriarylmethane Dye System in Aqueous Solution

Mingyu Lü ; Shaopu LIU

Chinese Journal of Analytical Chemistry.2001;29(3):323-326.

The reaction conditions, the spectrophotometric characteristics, and the analytical properties of the ion-association complex of 〔I2Br〕- with the basic triarylmethane dye such as ethyl violet (EV), crystal violet (CV), and victoria blue 4R (VB4R) in the presence of polyvinyl alcohol (PVA) were studied. The results showed that the color of the solutions would change obviously when the above ion-association complexes were formed in dilute phosphoric acid solution. The molar absorptivities (ε) of different systems are between 2.6×104 and 6.2×104 L*mol-1*cm-1. The sensitivity of the ethyl violet system is the highest among them. Beer′s law is obeyed in the range of 0～1.6　mg/L　I-　for ethyl violet system, 0～1.4　mg/L for crystal violet system, and 0～0.8 mg/L I- for victoria blue 4R system, respectively. The method can be applied to direct determination of iodide in aqueous solution. The method has good selectivity. A large amounts of halide ions, some other inorganic acid group ions and amount of common metal ions don′t interfere the determination of I-. This method was used to determine I- in kelp, laver and soy bean with satisfactory results

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