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Lin Q.,Fujian Inspection and Research Institute for Product Quality
Se pu = Chinese journal of chromatography / Zhongguo hua xue hui | Year: 2013

An improved method has been developed for the determination of clavulanate potassium, tazobactam and sulbactam in dairy products. High performance liquid chromatography with photodiode array detector (HPLC-PAD) was used in this method. The separation was performed on a CAPCELL PAK MG-C18 column (150 mm x 4.6 mm, 5 microm). The mobile phase was 0.03% (volume fraction unless otherwise specified) phosphate-acetonitrile. This method offered effective sample preparation procedures including dissolution with water, protein isolation with acetone, clean-up and enrichment by solid-phase extraction (SPE) with PWAX cartridges (60 mg/3 mL) under weak acidic condition and further elution with 0.05% ammonia-methanol solution. The analytical method was well validated and good results were obtained with the RSDs of 2.2% - 7.4% and the recoveries of 84.6% - 101.7%. The detection limits of clavulanate potassium, tazobactam and sulbactam were 0.03 mg/L. All of the target compounds exhibited good linearities (r > 0.999) over the mass concentration range of 0.05 - 5 mg/L. With the advantages of good purification effect, high sensitivity, good recovery and repeatability, the method is suitable for the detection of beta-lactamase inhibitors in dairy products. Source


Xu X.-Q.,Fujian Inspection and Research Institute for Product Quality
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2013

A simple and rapid method for determination of CaO, MgO, Fe2O3, Al2O3 and TiO2 in cement samples by inductive coupled plasma-atomic emission spectrometry (ICP-AES) was developed. In order to carry out the analysis, the cement samples were dissolved with mixed aqua regia, hydrofluoric acid, perchloric acid, hydrochloric acid, and the standard solution was prepared by a series of standard cement samples. The matrix interference and the mutual interference of elements under test were studied by ICP-AES. The detection limits are in the range of 3.79×10-4~1.07×10-2 μg·mL-1. The recovery rates and relative standard deviations (RSD) of the method are in the range of 87.5%~105.6% and less than 1% respectively. Research results show that the method can meet the requirements of rapid chemical analysis for cement. Source


Zhao Y.,Fuzhou University | Zheng J.,Fuzhou University | Fang L.,Fuzhou University | Lin Q.,Fujian Inspection and Research Institute for Product Quality | And 3 more authors.
Talanta | Year: 2012

A environment-friendly microwave-assisted extraction used to extract trace mercury compounds from fish samples, and a ultra-sensitive method for the analysis of Hg(II), methylmercury (MeHg) and ethylmercury (EtHg) by using capillary electrophoresis-inductively coupled plasma mass spectrometry (CE-ICP-MS) were described in this study. The extraction method is environment-friendly, simple, effective, and can be used to extract trace mercury compounds in fish samples with a satisfied recovery within several minutes. The CE-ICP-MS analytical method has a detection limit as lower as 0.021-0.032 ng Hg/mL for MeHg, EtHg and Hg(II), and can be used to determined ultratrace MeHg, EtHg and Hg(II) in natural water and fish samples directly without any preconcentration. With the help of the above methods, we have successfully determined MeHg, EtHg and Hg(II) in dried fish (Tapertail anchovy) muscle and natural water within 25 min with a RSD (relative standard deviation, n = 6) <5% and a recovery of 94-103%. Our results showed that dried muscle of T. anchovy contained only one species of mercury, MeHg, indicating that MeHg is easier to be accumulated by aquatic organisms. © 2011 Elsevier B.V. All rights reserved. Source


Wang Z.,Fujian Inspection and Research Institute for Product Quality
Chinese Journal of Chromatography (Se Pu) | Year: 2012

A confirmatory method is presented for the determination of five nitro-musks (musk ambrette, musk xylene, musk moskene, musk tibeten and musk ketone) in different cosmetics by gas chromatography coupled with negative chemical ionization (NCI)-triple quadrupole mass spectrometry (GC-MS / MS). The samples were extracted under ultrasonication using a mixture of acetone and hexane. The extract was concentrated and then cleaned up by CNWBOND Si solid phase extraction cartridge. Five different instrument parameters such as the temperature programmed, ion source temperature, reagent gas pressure, collision energy, monitoring ion pairs were optimized for higher sensitivity. Then the analytes were qualitatively and quantitatively analyzed under the multiple reaction monitoring (MRM) mode after the chromatographic separation on an HP-5MS capillary column (30 m × 0 25 mm, 0 25 μm), and employing d15-musk xylene as internal standard. The mixed standards were spiked in the blank cosmetics samples (each nitro-musk was about 500 ng / kg), and the recoveries were in the range of 85 81% -103 77% with the relative standard deviations (RSDs) not more than 5 32%. The limits of quantification of the method were about 50 0 -500 ng / kg. The method is accurate, rapid, sensitive and can be used in the inspection of the five nitro-musks in cosmetics. Source


You F.,Fujian Inspection and Research Institute for Product Quality
Chinese Journal of Chromatography (Se Pu) | Year: 2015

A sensitive method was developed for the simultaneous determination of six components which included 4,4′-diaminodiphenylamine sulfate hydrate and 2,4-diaminophenol sulfate, etc. in hair dyes by ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). After extracted by water through ultrasonic extraction, the samples were analyzed by UPLC-MS/MS. The separation was performed on a Waters BEH-C18 column (100 mm × 2.1 mm, 1.7 μm) with gradient elution of 10 mmol/L ammonium acetate and acetonitrile. The electrospray ionization (ESI) source in positive ion mode was used for the analysis of the six components in the multiple reaction monitoring (MRM) mode. The results showed good linear relationships with all the correlation coefficients (R2) more than 0.99. The limits of detection (LODs, S/N = 3) for the six components were in the range of 0.26-4.6 mg/kg. The average recoveries of the six components in the spiked samples were in the range of 83.0%-92.2% with the relative standard deviations (RSDs, n=6) of 5.4%-11.2%. The precision, accuracy, mean recoveries and the matrix effects satisfied the requirements of cosmetic sample measurement. The proposed method has been applied to the determination of six dyes in actual samples. This method is simple, accurate and effective for the simultaneous determination of the six components in hair dyes. Source

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