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A Simple Sampling Technique for the Analysis of VOCs Released from Packaged Meat
Paul Morris, Markes International
This application note describes the use of an easy-to-use grab-sampler for the rapid collection of volatile compounds in the headspace surrounding packaged meat. Analytes are directly collected onto sorbent tubes for analysis by thermal desorption (TD)–GC–MS. This approach offers particular advantages in terms of sensitivity enhancement and water management. Read More |
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Availability of Helium
Ed Connor, Peak Scientific
Peak Scientific’s latest application note discusses the rising concerns of the global helium shortage, whilst reviewing the implication it has for the GC market as well as assessing how Hydrogen can be used as an alternative carrier gas. Read More |
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Low-Molecular-Weight Heparins
Lin Rao and John Bierne, Wyatt Technology
Size-exclusion chromatography (SEC) has been the most common way of measuring the molecular weight and molecular weight distributions of LMWHs by using the two most common detection technologies: ultraviolet (UV) coupled with refractive index (RI) detection. However, these detectors embody a relative method to determine molecular weights, requiring calibration standards. Read More |
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Protein Molecular Weight Determination: SEC-MALS vs Conventional Calibration
Malvern Instruments
In this application note, proteins are separated and characterized using size exclusion chromatography. Molecular weights are measured by conventional calibration and multi angle light scattering (MALS), and the results compared. Read More |
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Total Extractable Fat from Food and Feed Matrices Using Pressurized Liquid Extraction
Philip Bassignani, FMS,Inc.
The extraction of total fat from samples is widely used in both the food and feed industries as well as for the analytical analysis of priority organic pollutants (POPs). For several compounds of concern like PCB and PBDE congeners, results are often expressed in amount for gram of lipid. In food and feed products, regulating fat content is essential in maintaining quality control. The following note details the usage of the FMS, Inc PLE for the extraction of total fat from a variety of sample matrices. Read More |
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Extraction of Phthalates from Milk Using ISOLUTE® SLE+
Frank Kero and Victor Vandell, Biotage AB, Sweden
This application note describes the extraction of phthalic acid ester plasticizers from a variety of commercial milk types using ISOLUTE®SLE+ supported liquid extraction columns. The fast, simple, and robust sample clean-up strategy minimizes matrix effects from the complex samples, and provides good analyte recovery and reproducibility. Read More |
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A Simple SPE Method for the Determination of Malachite Green, Crystal Violet and Other Synthetic Dyes in Seafood Coupled with LC—MS-MS Detection
Brian Kinsella, UCT, Inc.
Triphenylmethane dyes (TPM’s) are synthetic dyes used in aquaculturedue to their antibacterial, antifungal, and antiparasitic properties. They are cheap, effective, and readily available. Due to their toxicity, TPMs are banned in the United States and European Union. Analyzing TPMs can be difficult due to their instability. This application note uses an alternative elution solvent containing 1% triethylamine (TEA) and 0.5% formic acid. TEA acts as a counter-ion to release the dyes from the SPE sorbent. No evaporation step is required and eluted extracts are analyzed directly by LC–MS-MS. The method outlined allows for the rapid analysis of dyes in seafood while achieving good accuracy and precision and low sensitivity. Read More |
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