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July 2013 Residues Veterinary Medicinal Products Contaminants Pesticide Residues Analysis of Spinach Using QuEChERS by LC–MS-MS and GC–MS Sueki H. Leung, Monika M. Kansal, Carl Sanchez, Art Dixon, Michael Rummel, and Erica Pike Pesticide residue analysis of spinach by LC–MS-MS, GC–MS, and QuEChERS to quickly and effectively remove pigment and other matrix interferences from the difficult spinach sample. The lower limit of quantification (LLOQ) was well below the International Maximum Residue Level limit reported. Read More Pesticide Residues Analysis of Lettuce Using QuEChERS by LC–MS-MS and GC–MS Sueki H. Leung, Monika M. Kansal, Carl Sanchez, Art Dixon, and Erica Pike Pesticide residue analysis of lettuce by LC–MS-MS, GC–MS, and QuEChERS with recoveries of 70 to 120% and sample-to-sample variability <15%. The lower limit of quantification (LLOQ) was well below the maximum residue limit reported in the International Maximum Residue Level (MRL) database, demonstrating excellent performance of the roQ QuEChERS product for food safety testing. Read More Pesticide Screen from Food Samples Using a Synergi™ 2.5 µm Fusion-RP HPLC Column Phenomenex and AB Sciex The chemistry contained within Synergi Fusion-RP HPLC columns offers a balanced combination of hydrophobic and polar selectivities, allowing for the screening of 535 pesticides that exhibit polar and hydrophobic characteristics. Read More   Ultra-Selective High Resolution LC–MS-MS Determination of Phenylbutazone in Ground Meat Sueki H. Leung, Jenny Wei, Shahana Huq, and Seyed Sadjadi A simple yet effective solid phase extraction and cleanup method for phenylbutazone from meat with recovery values > 90%.  Highly specific LC–MS-MS data is generated using a Kinetex 2.6 µm XB-C18 core-shell column enabling rapid run times under 5 min with excellent precision and accuracy. Read More Improved Analytical Method for the LC–MS-MS Analysis of Chloramphenicol in Shrimp Philip J. Koerner, Matthew Trass, Liming Peng, and Jeff Layne A method for the analysis of chloramphenicol in shrimp has been developed with a limit of quantitation (LOQ) of .001 ng/g in shrimp (0.001 ppb) based on the calibration standards. This is 300 times lower than the current United States Food and Drug Administration (US FDA) method. Read More Rapid LC–MS-MS Analysis of Antibiotics in Meat for Human Consumption YunYun Zhou, Dave Lavorato, Terrell Mathews and Sky Countryman Rapid analysis of seven classes of antibiotics from meat products in less than 8 min results in shorter cycle times and improved productivity ultra-high efficiency Kinetex core-shell columns provide narrower peaks and increased sensitivity. Read More Antibiotic Screen from Bovine Kidney Juice Using Sepra C18-E Sorbent Gemini C18 HPLC Columns Phenomenex and AB Sciex Antibiotics are successfully isolated from bovine kidney juice using a non-retentive clean up step and are then analyzed via LC–MS-MS. Read More   Rapid, High Resolution Analysis of Aflatoxin Extracts from Peanut Butter Sky Countryman, Shahana Huq, and Terrell Mathews A two-stage solid phase extraction (SPE) procedure is effective in removing detector interfering contaminants from the difficult sample matrix, peanut butter, while maintaining absolute recoveries above 80%. Improved separation of aflatoxins is achieved, allowing for rapid run times under 2 min with great precision and accuracy. Read More LC–MS-MS Analysis of Mycotoxins and Other Fungal/Bacteria Metabolites Using a Gemini C18 HPLC Column Phenomenex and AB Sciex 243 Mycotoxins and other fungal/bacteria metabolites are successfully analyzed by LC–MS-MS from several sample matrices. Read More LC–MS-MS Analysis of Azo and Sudan Dyes from Food Matrices Phenomenex and AB Sciex This method explores the analysis of several azo and sudan dyes from food matrices by LC–MS–MS analysis. Read More   Go to Application Note Library Subscribe to the Application Note Alert LCGC Print Edition LCGC Digital Edition