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Residues of MB were extracted from homogenized tissues with acetonitrile\/sodium acetate buffer solution, and simply cleaned up with dichloromethane liquid\/liquid extraction. After concentration and dissolution, the sample solutions were cleaned up by the neutral alumina and weak cation\u2010exchange solid phase extraction (SPE) cartridge, prior to LC\u2010MS\/MS analysis. MB was determined at 1.0\u201320\u2009\u03bcg\/kg in eel, toasted eel and shrimp, with a limit of quantification of 0.5\u2009\u03bcg\/kg. Recovery for MB was between 73.0% and 108.3%. This method is fast, exact and sensitive. It can be applied to determine MB in aquatic products.<\/jats:p>","DOI":"10.1002\/jssc.200900364","type":"journal-article","created":{"date-parts":[[2010,1,11]],"date-time":"2010-01-11T17:15:39Z","timestamp":1263230139000},"page":"4193-4199","source":"Crossref","is-referenced-by-count":59,"title":["Determination of methylene blue residues in aquatic products by liquid chromatography\u2010tandem mass spectrometry"],"prefix":"10.1002","volume":"32","author":[{"given":"Jin\u2010Zhong","family":"Xu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin","family":"Dai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tao","family":"Ding","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun\u2010Jie","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hong","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui\u2010Lan","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chong\u2010Yu","family":"Shen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuan","family":"Jiang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2010,1,11]]},"reference":[{"key":"e_1_2_6_2_2","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1093\/jaoac\/80.1.31","volume":"80","author":"Turnipseed S. 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