title: Membrane sampling with microdialysis coupled to HPLC/UV for on-line simultaneous determination of melamine and cyanuric acid in non-dairy coffee creamer.
abstract: An on-line microdialysis/high-performance liquid chromatography method was developed for the simultaneous determination of melamine and cyanuric acid in non-dairy coffee creamer.  To collect these analytes from aqueous samples, the microdialysis system featured a microdialysis probe incorporating a polyarylethersulfone membrane and employed 0.05 M HCl in 0.1% (v/v) MeOH as the perfusate, with optimal efficiency obtained at a flow rate of 1 µL min(-1).  The chromatographic conditions were optimized when using a reverse-phase phenyl column and a mobile phase of phosphate buffer solution in 10% (v/v) MeOH, buffered at pH 3.0.  Good linearity relationship (r(2) > 0.9987), intra- and inter-day precisions (RSDs < 6.6%), recoveries (96.9 - 105.0%), and limits of detection (melamine, 3 ppb; cyanuric acid, 150 ppb) were observed for the two analytes.  This method has been successfully applied to simultaneous determination of melamine and cyanuric acid in commercial creamers with the recoveries in the range of 97.5 to 102.6%.
authors: Department of Public Health, College of Health Science, Kaohsiung Medical University, Kaohsiung, Taiwan.
authors: Yu-Ying
authors: YY
authors: Chao
authors: Yu-Tzu
authors: YT
authors: Wei
authors: Cheuch-Ting
authors: CT
authors: Lee
authors: Hwang-Shang
authors: HS
authors: Kou
authors: Yeou-Lih
authors: YL
authors: Huang
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003069:Coffee; D005503:Food Additives / Q000737:chemistry*; D005504:Food Analysis / Q000379:methods*; D008567:Membranes, Artificial; D014227:Triazines / Q000032:analysis*; D014466:Ultraviolet Rays
chemical_list: D003069:Coffee; D005503:Food Additives; D008567:Membranes, Artificial; D014227:Triazines; C004632:cyanuric acid; C011907:melamine