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

Quantitative Mechanical Property Mapping with PeakForce QNM
Bede Pittenger, Natalia Erina, Bruker Nano Surfaces Division
Dr. André Kempe, ScienceAnalytics

The unambiguous and quantitative modulus and adhesion data provided by PeakForce QNM® can help to answer the critical question of what materials are abundant on a topographic area and how they are distributed. QNM makes possible to study the variation and position of mechanical properties across ...

© BIOPRO Baden-Württemberg GmbH
Bioanalysis - techniques for the characterization of biological material
Stefanie Heyl, © BIOPRO Baden-Württemberg GmbH
Everybody who studies natural organisms can be called a bioanalyst. Bioanalysis is therefore as old as mankind. Our biological knowledge is increasing rapidly and, along with it, the range of methods that have become available over the last decades to analyze complex biological samples. Science c...

Retsch GmbH
The Basic Principles of Sieve Analysis
Retsch GmbH
Many natural and manufactured materials occur in a disperse form, which means that they consist of differently shaped and sized particles. The particle size distribution, i.e. the number of particles of different sizes, is responsible for important physical and chemical properties such as: mechan...

Polymer formation from CO2 - a Dream Production
Clemens Minnich, S-PACT
Gernot Nell, Parr Instrument Deutschland GmbH
Katrin Böhm, CAT Catalytic Center

The utilisation of CO2 as a feedstock for chemical syntheses has been envisioned by chemists for a long time. However, its chemical inertness and the high activation energy prohibited many straightforward routes to generate value-added products from CO2 so far. Recent developments in high-perform...

Metrohm International
Round robin tests for trace analysis of heavy metals in drinking water
Metrohm International
Trace analysis is becoming increasingly important. Contributing to that trend are ever tighter directives for maximum concentrations of contaminants. Regulations call for sensitive and reliable methods that can quantify minute amounts of substances harmful to human health and the environment. ...

Hochschule Fresenius, Idstein
Fluorine analysis using molecular absorption spectroscopy
Dr. Tobias Frömel, Sascha Münster-Müller, Prof. Thomas P. Knepper, Hochschule Fresenius, Idstein
Fluorinated organic substances gained in importance in recent decades, because substitution with fluorine holds many beneficial characteristics for the application. Not only fluorinated polymers, such as polytetrafluorethylene (PTFE, Teflon®) are encountered at many places in everyday life, but m...

Chemisches und Veterinäruntersuchungsamt (CVUA) Stuttgart
Analysis of Perchlorate in Food Samples of Plant Origin Applying the QuPPe-Method and LC-MS/MS
Ellen Scherbaum, Julia Hepperle, Anne Wolheim, Chemisches und Veterinäruntersuchungsamt (CVUA) Stuttgart
This study reports about how to integrate the environmental contaminant perchlorate into the QuPPe multiresidue method for the analysis of polar pesticides. Perchlorate, along with a number of polar pesticides, was extracted with acidified methanol. The extracts were filtered and subjected to liq...

© BIOPRO Baden-Württemberg GmbH
Peptides - diverse molecules of life
Walter Pytlik, © BIOPRO Baden-Württemberg GmbH
Peptides exist in all organisms, wherever there are cells. The range of their physiological functions is huge. Biologically active peptides can act as hormones, neurotransmitters, growth factors as well as toxins and antibiotics. This is what makes them highly interesting drug leads. They are use...

Analytik Jena AG
Background Correction In AAS - Can You Really Trust It As Much As You Do?
Oliver Büttel, Analytik Jena AG
Background Correction (BGC) is an essential part of any spectrometric analysis. Typically a non-specific signal, the spectral background, is superimposed on the analyte-specific signal and needs to be excluded to obtain the net analyte signal. Different techniques have been developed to distingui...

Metrohm International
The multipurpose poison
Metrohm International
Arsenic has many facets, but the primary one is the hazard it poses to millions of people around the world. Throughout the course of history, people have found uses for the various properties of arsenic and its compounds. Red and yellow arsenic sulfides (As2S3 and As4S4) were used in antiquit...

Chemisches und Veterinäruntersuchungsamt (CVUA) Stuttgart
Determination of quaternary ammonium compound residues in fruits and vegetables by QuEChERS following LC-MS/MS analysis
Ellen Scherbaum, Julia Hepperle, Dr. Eberhard Schüle, Chemisches und Veterinäruntersuchungsamt (CVUA) Stuttgart
A simple and fast method to determine residues of quaternary ammonium compounds (QAC) in fruit and vegetable samples is presented. The analytes were extracted applying the frequently used QuEChERS method. Analysis was performed by liquid chromatography-electrospray tandem mass spectrometry (LC-ES...