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The analytes were determined using high-performance liquid chromatography with ultraviolet detector. The influence of several variables on the efficiency of the extraction procedure was investigated by single-factor experiments. The temperature, pH, and amount of extraction solution were selected for optimization experiment using response surface methodology. The calibration curves showed good linearity (<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M1\"><mml:mrow><mml:msup><mml:mi>R<\/mml:mi><mml:mn>2<\/mml:mn><\/mml:msup><mml:mo>&gt;<\/mml:mo><mml:mn>0.99<\/mml:mn><\/mml:mrow><\/mml:math>) for all analytes in the range of 0.1\u201320\u2009<jats:italic>\u03bc<\/jats:italic>g\/mL. The four antibiotics were successfully extracted from manure with recoveries ranging from 81.89 to 92.42% and good reproducibility (RSD, &lt;4.06%) under optimal conditions, which include 50\u2009mL of McIlvaine buffer extraction solution (pH 7.15) mixed with 1\u2009g of manure sample, extraction temperature of 40\u00b0C, extraction time of 10\u2009min, and three extraction cycles. Method quantification limits of 1.75\u20132.32\u2009mg\/kg were obtained for the studied compounds. The proposed procedure demonstrated clear reductions in extraction time and elimination of cleanup steps. Finally, the applicability to tetracyclines antibiotics determination in real samples was evaluated through the successful determination of four target analytes in swine, cow manure, and mixture of animal manure with inorganic fertilizer.<\/jats:p>","DOI":"10.1155\/2015\/290903","type":"journal-article","created":{"date-parts":[[2015,4,6]],"date-time":"2015-04-06T09:48:41Z","timestamp":1428313721000},"page":"1-10","source":"Crossref","is-referenced-by-count":14,"title":["Response Surface Optimization of a Rapid Ultrasound-Assisted Extraction Method for Simultaneous Determination of Tetracycline Antibiotics in Manure"],"prefix":"10.1155","volume":"2015","author":[{"given":"Lanqing","family":"Li","sequence":"first","affiliation":[{"name":"Department of Environment and Resource, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, 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