ミキサーミル MM 400

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Videoanimation - Mixer Mill function
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アプリケーションレポート (17)

毛髪が語るもの
科学捜査、税関および競技スポーツの分野で違法薬物の検出は大変重要です。化学物質は血液、唾液、尿および毛髪から検出されますが、特に毛髪は、長さにより異なりますが、長期間蓄積されるという利点があるため薬物乱用の痕跡やDNA鑑定などに使われています。

蛍光X線分析用の試料調製
蛍光X線分析は質量分析に広く使われている分析方法ですが、試料調製が正しく行われないと正確で再現性の高い分析結果が得られません。

生体試料中の有害物質の分析
凍結粉砕で生物試料の調製が容易になります。　動植物は環境汚染の度合いを測るうえで信頼できる指標です。したがって環境分析の最も重要な手段のひとつとして、生体試料中の有毒物質の分析があります。レッチェ社の粉砕機は試料の特質や成分を損なうことなく調製できるので、世界中の環境分析機関で活躍しています。ここでは、テキサスの微量元素研究所とオタワの国立カナダ野生生物研究所の2件をご紹介します。

What Hair Reveals
The detection of illegal drugs and pharmaceuticals plays a role in various fields, for example in forensic science, road traffic accidents, in competitive sports or at the workplace. Chemical substances can be detected in blood, saliva, urine and in hair. Hair has the great advantage of storing the substances for a long period, which means that detection is still possible several months after consumption of the drug. In addition to the detection of drugs, hair samples are also used for DNA analysis as well as for the analysis of heavy metals and minerals.

Representative sample preparation for XRF analysis
Preparing homogeneous samples by milling

Efficient Grinding at –196 °C
RETSCH’s New CryoMill for Safe and Reproducible Grinding with Liquid Nitrogen

Tracking Down Fake Cashmere
Cashmere wool is the best known precious wool. It is won from the cashmere goat which originates from the high mountain region of the same name. Due to its properties such as softness and warmth, cashmere wool gains more and more popularity in the manufacture of clothing. Genuine cashmere is won solely from the goat’s downy hair and must possess a certain hair structure with an exactly defined length and thickness.

Sick with Dolls
Traces of Heavy Metals in Toys

Green Chemistry in the Lab
Mechanochemistry is a very effective method to carry out syntheses without solvents and by-products. The technical literature describes a great number of reactions where a conversion of 100% is achieved. A precondition for the establishment of mechanochemistry in the industrial sector is the availability of suitable laboratory mills. A decisive factor is that – similar to conventional preparative chemistry – ambient parameters such as pressure and temperature can be documented and monitored. The Planetary Ball Mills and Mixer Mills from Retsch fulfill these requirements.

Size reduction within the context of sample preparation
In general “size reduction” is taken to mean the disintegration of solid substances by mechanical forces without altering their state.

Making Whole Cell Extract of Saccharomyces cerevisiae
Preparation at the Courtesy of the Staley Lab at the University of Chicago

Sample Preparation of Solid Materials for the XRF-analysis
X-Ray fluorescence is one of the most versatile methods to determine elements in a sample. The material is exposed to x-rays that cause each element to emit its own unique fluorescent x-ray. The subsequent analysis of the results is based on comparisons to standard samples with given chemical composition.

Bigger is not Better
There is a trend towards smaller samples that have more controlled particle size and yet remain representative of the material being analyzed.

Cryogenic Preparation of Sample Materials
Within the context of sample preparation, size reduction plays an important role as it has a substantial influence on the results of the subsequent analysis. If the particles are too coarse or non-homogeneous the results of the analysis may turn out to be incorrect, especially if there is only a very small amount of sample material which represents the total amount.

Cryogenic disruption of yeast cells
The MM 301 can be used for cell disruption applications. In this case, yeast cells were embrittled with liquid nitrogen.

Von der Probe zum Pressling – Probenvorbereitung von Feststoffen für die Röntgenfluoreszenz
Aufgrund der Einfachheit der eigentlichen RFA-Messung wird häufig der Aspekt der optimalen Probenvorbereitung übersehen, was sich dann in mangelnder Reproduzierbarkeit bis hin zu falschen Ergebnissen auswirken kann.