Mengrui Yang

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Nanometer-sized semiconductor particles (CdTe) were used as an inorganic matrix for the laser desorption/ionization mass spectrometry of fatty acids. The excitation power dependence of the peak intensity of stearic acid (Ste), [Ste - H](-), was observed, and it was proportional to the square of the excitation power. The peak intensity of [Ste - H](-)(More)
  • Xinhua Dai, Xiang Fang, +4 authors Ruifeng Xu
  • Journal of chromatography. B, Analytical…
  • 2010
A high order method for measuring urea concentrations in milk and milk powder was developed. The method can be applied to certify the concentration of urea in some new milk and milk powder CRMs. This high accurate method for analysis of milk is valuable given the inherent challenges associated with the complexity of the sample matrix. A measurement(More)
Prior to preparation of CRM candidate of chloramphenicol in methanol with a concentration of 100 mg/L, two independent methods including mass balance (MB) and quantitative nuclear magnetic resonance (qNMR) were employed to precisely measure the mass fraction of pure chloramphenicol materials. The mass fraction was assigned to be 99.8% with uncertainty of(More)
α-Cyano-4-hydroxycinnamic acid (CHCA), an organic matrix molecule for matrix-assisted laser desorption/ionization mass spectrometry, was adsorbed to NH4 (+)-type zeolite surface, and this new matrix was used for the detection of low-molecular-weight compounds. It was found that this matrix could simplify the mass spectrum in the low-molecular-weight region(More)
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