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Technical papers, application notes and case studies from laboratory, chemistry, life science and quality control

Metrohm International
Determining the oxidation stability of fats and oils using the Rancimat method
Metrohm International
Foodstuffs that contain fat - like butter, nuts, cookies, and potato chips - turn rancid over time. This is caused by chemical changes in the fat; in particular, its oxidation. Because of this, determining the oxidation stability of fats and oils in foods has proven to be a useful tool in the qua...

Chemisches und Veterinäruntersuchungsamt (CVUA) Stuttgart
Analysis of Phosphine in Dried Foodstuffs via Headspace-GC-MSD
Roland Perz, Anne Benkenstein, Ellen Scherbaum, Chemisches und Veterinäruntersuchungsamt (CVUA) Stuttgart
Phosphine is one of the most widely used, cost-effective and rapidly acting fumigants. In EU legislation , maximum residue limits for the sum of phosphine and phosphides in foodstuff are set to within a range of 0.01 and 0.1 mg kg-1, depending on the commodity. A highly sensitive headspace-GC-MSD...

Analytik Jena GmbH
Direct Determination of Trace Elements in Body Fluids Using ICP-Mass Spectrometry
Dr. René Chemnitzer, Analytik Jena GmbH
The better understanding of the relevance of various elements in metabolic and other processes in organisms leads to increased interest in the analysis of biological samples like body fluids. Here, the focus is on supply of essential elements and detection of toxic elements. Fast and more sensiti...

Leica Microsystems GmbH
From Light to Mind: Sensors and Measuring Techniques in Confocal Microscopy
Dr. Rolf T. Borlinghaus, Leica Microsystems GmbH
This article outlines the most important sensors used in confocal microscopy. By confocal microscopy, we mean "True Confocal Scanning", i.e. the technique that illuminates and measures one single point only. The aim is not to impart in-depth specialist knowledge, but to give the user a small but ...

Chemisches und Veterinäruntersuchungsamt (CVUA) Stuttgart
A novel tube-in-tube filter system for refinement of DNA preparation for detection of Mycobacterium using Real-Time PCR
Reinhard Sting, Lisa Schneider-Bühl, Chemisches und Veterinäruntersuchungsamt (CVUA) Stuttgart
Eduard Woizenko, HAMILTON Bonaduz AG

A novel tube-in-tube filter system, the AutoLys M 1.0 tube with a 1 µm pore size non-DNA binding and RNase and DNase free filter designed and produced by HAMILTON Bonaduz AG could be successfully integrated in the procedure of DNA extraction from fecal samples for testing on Mycobacterium avium s...

Metrohm International
Determine sodium titrimetrically
Metrohm International
In the presence of an excess of potassium and fluoride ions, sodium reacts exothermically with aluminum to produce NaK2AlF6 (elpasolite). This reaction is the cornerstone of a new method for determining sodium in foodstuffs using thermometric titration. Not only is it rapid, straightforward, and ...

Restek GmbH
Analysis of Nicotine and Impurities in Electronic Cigarette Solutions and Vapor
Jason S. Herrington, Colton Myers, Amanda Rigdon, Restek GmbH
Electronic cigarettes (e-cigarettes) are growing in popularity exponentially. Despite their ever-growing acceptance, relatively little work has been done to characterize their vapor. To date, the majority of e-cigarette research has focused on characterizing the solutions, which are ultimately va...

Analytik Jena GmbH
Speciation of arsenic in apple juice by LC-ICP-MS
Andrew Ryan, Peio Riss, René Chemnitzer, Analytik Jena GmbH
The different physico-chemical forms of most elements vary in terms of mobility, toxicity and bioavailability. For example, arsenic species such as the inorganic trivalent arsenic (As III) and pentavalent arsenic (AsV) are highly toxic whereas the organic forms as monomethyl arsenic (MMA) and dim...

Online NMR spectroscopy empowered by Indirect Hard Modeling
Dr. Clemens Minnich, S-PACT
Nuclear Magnetic Resonance (NMR) spectroscopy has finally found its way into the Process Analytical Technology (PAT) toolbox. Powerful benchtop equipment capable of sampling-free online use, coupled with intelligent ways of chemometric spectral analysis, boosts the applicability of the technology...

Mettler-Toledo GmbH
Softening Point Experiments Compare Methods' Ease, Accuracy
Mettler-Toledo GmbH
A petrochemical product's softening point impacts performance; however, complex test sample preparation and varying heating requirements can present repeatability challenges that affect quality. Comparative softening point studies on bitumen samples using ASTM D 3461 (Mettler cup-and-ball) and AS...

Chemisches und Veterinäruntersuchungsamt (CVUA) Stuttgart
Identification of Salmonella Enterica Serovar Enteritidis Vaccine Strains by Fourier Transform Infrared Spectroscopy
Dr. Norman Mauder, Dr. Jörg Rau, Chemisches und Veterinäruntersuchungsamt (CVUA) Stuttgart
In cases of salmonellosis in humans, the most frequently isolated serovars of Salmonella enterica are Enteritidis (serogroup D1) and Typhimurium (serogroup B). In order to control the main sources of this zoonotic pathogen, poultry populations are treated with attenuated live vaccines. The distin...

Leica Microsystems GmbH
Super-Resolution - On a Heuristic Point of View About the Resolution of a Light Microscope
Dr. Rolf T Borlinghaus, Leica Microsystems GmbH
Since super-resolution has become one of the most favored methods in biomedical research, the term is gaining in popularity. Still, there is considerable confusion about what super-resolution is and what resolution is at all. Here, the classical view of microscopic resolution is discussed and som...

Metrohm International
Chromium(VI) determination in toys
Metrohm International
You may deem the chance slim that mythical monsters are hiding underneath your offspring's beds. However, danger might be lurking there in the form of toy blocks, action fi gures, or crayons. Hazardous substances found in everyday items, including toys, pose a particular threat to children. Even ...