Mulino a mortaio RM 200

Informazioni tecniche (1)

Reports applicativi (9)

  • Bigger is NOT Better – Preparazione del campione nell’industria farmaceutica

    Introduzione: La tendenza è quella di avere quantità di campione dalle dimensioni sempre minori e controllate ma comunque rappresentative.

    Nell’analisi dei materiali solidi certamente non si applica il detto popolare “più grande è meglio”. L’obiettivo è produrre particelle sufficientemente piccole da soddisfare i requisiti delle analisi, garantendo nel contempo una rappresentazione accurata del materiale originale.
    Le “particelle” d’interesse per l’analista vanno generalmente da 10 µm a 2 mm, ma in molte applicazioni sono necessarie granulometrie ancora più fini.
    Un esempio sono i principi attivi, dove è necessario operare nel range dei submicron. Infine, per l’estrazione di DNA ed RNA, la tecnica della lisi cellulare è già ben consolidata.
  • Dalla pianta di cacao alle barrette di cioccolato

    Cosa sarebbe il mondo senza cioccolato? La produzione di cioccolato è un processo abbastanza elaborato, di cui un requisito fondamentale è il controllo qualità delle materie prime. La strada dalle piante di cacao alle barrette di cioccolato è lunga. A causa delle molte fasi di lavorazione, raccolta, fermentazione, essiccazione, pulitura, torrefazione, pre-frantumazione e infine la macinazione dei pennini di liquore di cacao da cui vengono estratti cacao in polvere e burro di cacao – ci possono essere differenze significative nella qualità. Il processo di controllo della qualità non comprende soltanto test di pericolosità del prodotto (es. funghi, contaminazione da metalli pesanti) o di altri ingredienti (contenuto di grassi e carboidrati) ma anche la riduzione delle dimensioni per test sensoriali sul liquore di cacao. Questo è importante perché il palato umano percepisce in modo sgradevole particelle più fini di 30 microns. 
  • White Paper: Cryogenic Preparation of Sample Materials

    A solid sample material should always be sufficiently prepared by size reduction and homogenization before it is subjected to chemical or physical analysis. Care should be taken that the analysis sample fully represents the original material and that the sample preparation process is carried out reproducibly. Only then are meaningful results guaranteed. Most sample materials can be reduced to the required analytical fineness at room temperature by choosing a mill with a suitable size reduction principle (impact, pressure, friction, shearing, cutting).
  • From cacao tree to chocolate bar

    The way from the cacao tree to the chocolate bar is a long one. Due to the many processing stages – harvest, fermentation, drying, cleaning, roasting, pre-crushing and finally grinding the cocoa nibs to liquor from which cocoa powder and cocoa butter are pressed – there may be significant differences in the quality.
  • The effect of grinding tools 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 product range also comprises a wide choice of grinding tools and accessories which helps to ensure contamination-free preparation of a great variety of sample materials.
    The selection of the correct grinding tool depends on the sample material and the subsequent method of analysis. Different grinding tools have different characteristics, such as required energy input, hardness or wear-resistance.
  • As fine as necessary

    A variety of methods can be used to analyze solid materials. What they all have in common is the necessity to use a representative, homogeneous analysis sample which needs to have a particular fineness, depending on the analytical method used. The size reduction and homogenization of solids is usually carried out with laboratory crushers and grinders.
  • Representative Analysis Results Require Adequate Sample Preparation

    A faultless and comparable analysis is closely linked to an accurate sample handling. Only a sample representative of the initial material can provide meaningful analysis results. Rotating dividers and rotary tube dividers are an important means to ensure the representativeness of a sample and thus the reproducibility of the analysis. Correct sample handling consequently minimizes the probability of a production stop due to incorrect analysis results. Thus correct sample handling is the key to effective quality control.
  • 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.

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