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• W2034951854 abstract "Abstract A rapid, sensitive, and specific method has been developed and validated for the simultaneous analysis of nine estrogens in milk powder, including estriol, β-estradiol, a-estradiol, equilin, 17a-ethinylestradiol, estrone, diethylstilbestrol, dienestrol, and hexestrol using ultra-performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF-MS). The milk powder was dissolved in water, the estrogens were extracted with acetonitrile using ultrasonication, and the fat in the extracted solution was removed by liquid-liquid extraction with n-hexane. Then, the estrogens were purified using a NH2-containing solid-phase extraction cartridge, separated on a Waters ACQUITY UPLC HSS T3 column (100 mm × 2.1 mm × 1.8 μm), and analyzed both qualitatively and quantitatively by UPLC-Q-TOF-MS. The overall analysis time of the proposed method was 13 minutes, and the linear range was between 0.001–0.5 mg L−1, with a correlation coefficient greater than 0.993. The limits of detection for the compounds were 0.11–0.30 μg kg−1, and the limits of quantification were within the range 0.37–1.0 μg kg−1. The mass errors between the theoretical and experimental masses obtained for the deprotonated molecules of the nine estrogens and the internal standard (β-estradiol-d3) were between −1.0 and 0.9 mDa. At the spiked levels of 1, 2, 10, and 100 μg kg−1, the average recoveries ranged from 61% to 137%, with relative standard deviations ranging between 1.0% and 22.6%, as determined by the matrix-matched internal-standard method. The results showed that the proposed method was suitable for the multiresidue detection of estrogens in milk powder and was successfully applied to the detection of estrogens in seven real milk powder samples." @default.
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• W2034951854 date "2011-09-01" @default.
• W2034951854 modified "2023-09-26" @default.
• W2034951854 title "Simultaneous Analysis of Nine Estrogens in Milk Powder with Ultra-Performance Liquid Chromatography Coupled to Quadrupole Time-of-Flight Mass Spectrometry" @default.
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• W2034951854 doi "https://doi.org/10.1016/s1872-2040(10)60469-0" @default.
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