White paper (3)
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White Paper. Different sieving methods for a variety of applications
The determination and knowledge of the particle size distribution is an essential part of the quality control process for industrial products. Easy handling, low investment cost and high accuracy make sieve analysis one of the most frequently used procedures for measuring the particle size. This white paper gives an overview of the different sieving techniques and describes the necessary steps to ensure reliable results. -
White Paper: How to minimize standard deviations by correct sample preparation
Modern analytical methods increase precision and push detection limits to make even the smallest traces of sample components detectable. Despite this development sample preparation, which is carried out prior to the actual analysis, is frequently neglected. Errors caused by lacking accuracy in sample preparation have a much bigger impact than errors made during analysis. -
White Paper: Ultrafine Grinding with Laboratory Ball Mills
How are nano particles produced? The “Bottom-Up” method synthesizes particles from atoms or molecules. The “Top-Down” method involves reducing the size of larger particles to nanoscale, for example with laboratory mills. Nano particles are produced by colloidal grinding which involves dispersion of the particles in liquid to neutralize the surface charges. Factors such as energy input and size reduction principle make ball mills the best choice for the production of nanoparticles.
Rapport de tests (12)
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Analyse des contaminants dans les échantillons biologiques
Le broyage cryogénique facilite la préparation des échantillons d’origine animale -
Détection des mycotoxines dans les noix
Pré-broyage et broyage fin -
Détermination des matières grasses dans les aliments et les fourrages
Broyage d’échantillons gras -
Les métaux lourds dans les jouets
Du broyage à l’analyse -
Préparation d’échantillons pour l’analyse par fluorescence X
De l’échantillon à la pastille -
Une finesse extrême à très grande vitesse
Depuis des années, les scientifiques font des recherches sur les nanoparticules, des particules ultrafines avec un diamètre de moins de 100 nanomètres. Le recours aux nanoparticules offre des perspectives nouvelles et variées, par exemple pour le développement de propriétés semi-conductrices ou de surface (l’effet lotus, par exemple).
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Cryogenic disruption of yeast cells according to the Rout Protocol
The Michael Rout Lab at the Rockefeller University in New York, NY, initially contacted RETSCH Inc. in 2006 to discuss the possibility of using the Planetary Ball Mill to cryogenically grind yeast cell pellets. The aim of their experiment was to explore the construct of Nuclear Pore Complexes located on the cell walls of yeast cells. The decision to use a Planetary Ball Mill for this application was mainly based on the fact that it produces very small particle sizes which were considered an important prerequisite for more in-depth analysis of the yeast cells. -
Grinding tools - their effect on metal contamination
Reliable and accurate analysis results can only be guaranteed by reproducible sample preparation. This consists of transforming a laboratory sample into a representative part sample with homogeneous analytical fineness. Retsch offers a comprehensive range of the most modern mills and crushers for coarse, fine and ultra-fine size reduction of almost any material. The selection of the correct grinding tool depends on the sample material and the subsequent method of analysis. -
Mixer Mill MM 400: Upgrade of a True Multipurpose Mill
With the Mixer Mill MM 400 RETSCH has developed a true multipurpose mill which covers a huge range of applications, including classic mixing and homogenization but also more complex tasks like cell disruption via bead beating or mechanochemical processes. The ease of use of mixer mills in general, combined with a wealth of accessories make the MM 400 the perfect choice for quick, safe and reproducible processing of small sample volumes. -
Particle size - a quality feature
The determination of the particle size distribution of a product has always been of great significance in food production. Taste, color, solubility or extraction behavior are only a few examples of product properties which are directly influenced by particle size. In the testing laboratory of the St. Petersburg branch of LLC Wrigley, RETSCH sieve shakers AS 200 jet and AS 200 control are utilized for particle size analysis of fine powders which are used for chewing gum production. -
Representative results require adequate sample preparation
The following situation is typical for many production plants: After a routine quality check, the production process is stopped or an already produced batch is suspended, because the analysis results were not within the relevant critical values. But does the tested product really deviate from the specifications? It is often not the product itself which causes irregular analysis results but a lack of understanding of the steps which come before the analysis. -
Sample Preparation with the High Energy Ball Mill Emax- Time Advantage in Pharmaceutical Research
The development of drugs with poorly soluble to insoluble active ingredients is a big challenge for the pharmaceutical industry. The bioavailability of orally taken active ingredients, which means to what extent and in which period of time the substance is ingested by the body and is available at the place of action, strongly depends on the percentage dissolved in the gastrointestinal tract. One way to improve the solubility and thus the bioavailability of active ingredients is the pulverization of these substances.
Témoignages (2)
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Contrôle de la qualité de la chaux - Schaeferkalk
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Sample preparation in the mining industry - Museum of Mining, Russia
