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Solid-Phase Extraction and Analysis Of Phosphorus Flame Retardants from Drinking Water
Philip Bassignani, FMS,Inc.
Phosphorus flame retardants (PFR) have come under scrutiny because of potential health concerns. As a result, testing procedures and regulation guidelines have begun to surface for monitoring of many of these compounds. Solid-phase extraction (SPE) is an ideal fit for monitoring these analytes in water sources designated for human consumption. The following described method employs automated SPE paired with GC Triple Quad analysis to deliver low levels of detection for a selection of PFR commercially available from standard manufacturers. Download the app note |
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Method Development of Mixed-Mode Solid-Phase Extraction for Forensics Appliations
Mike Chang, Agilent Technologies
Read this overview of sample preparation method development using Agilent Bond Elut Certify mixed-mode solid-phase extraction to shorten the method development process or to improve an existing method. Download the app note |
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Extraction of GHB from Urine Using ISOLUTE® SLE+ Prior to GC–MS
Rhys Jones, Biotage AB, Sweden
This application note describes the extraction of gamma-hydroxybutyric acid GHB from urine using supported liquid extraction and subsequent analysis by GC–MS. This method demonstrates a simple extraction protocol with high recoveries and RSDs less than 10%. Download the app note |
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Determination of Pesticide Residues in Tea: An AOAC Collaborative Study
Xiaoyan Wang, UCT, Inc.
Tea is widely consumed globally. The application of pesticides during cultivation is a common practice, making testing for pesticide residues important for human safety. However, teas are a complex matrix making extraction and cleanup challenging. Dr. Guo-Fang Pang and colleagues at the Chinese Academy of Inspection and Quarantine have developed a method to quantitatively determine multiclass pesticide residues in tea. The method employs solvent extraction, solvent reduction and SPE cleanup. In this application samples were analyzed by GC–MS with excellent linearity and recoveries. Download the app note |
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Absolute Molar Mass in UHPLC via the µDAWN and UT-rEX
Sophia Kenrick and Aym Berges, Wyatt Technology Corporation
Ultrahigh-performance liquid chromatography (UHPLC) enables fast, efficient separation of biomolecular samples. Compared to standard SEC, UHPLC–SEC provides improved resolution, higher throughput, less solvent, and smaller sample consumption for analysis of precious biological samples. Download the app note |
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Characterization of Whey Protein Isolate (WPI) Using Multi-Detector SEC
Malvern Instruments
In this application note, a sample of whey protein isolate (WPI) was characterized using the Viscotek TDAmax. The four major components in this mixture — β-lactoglobulin , α-lactalbumin, serum albumin, and immunoglobulin — were separated and individually characterized to determine their molecular weight and size. Download the app note |
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