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Alimenti / Mangimi

Caso Applicativo (3)

  • 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: 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. 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).
  • White Paper: Reproducible Sample Preparation for Reliable Food Analysis

    Food occurs in a great variety of consistencies and is often inhomogeneous. Food testing labs require representative samples to produce meaningful and reproducible analysis results. Therefore, food samples must be homogenized and pulverized to the required analytical fineness, ideally with as little time and effort as possible.

Flyers (2)

Rivista dell'azienda "il campione" (1)

  • No. 43

    Reproducible sample preparation with RETSCH laboratory millsl
    [in più...]

Reports applicativi (20)

  • 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. 
  • Determinazione dei grassi negli alimenti e nei mangimi

    Macinazione di campioni a elevato contenuto lipidico
  • Le barrette di cereali sono veramente sane?

    I produttori alimentari spesso promuovono i propri prodotti come “light” o come, nel caso delle barrette di cereali come “sane”. Se questo è effettivamente vero, non può che essere verificato analizzando i valori nutrizionali, una procedura che costituisce una parte importante nel controllo della qualità alimentare. I valori di grassi, acidi grassi saturi, zuccheri e sale stampati sulle confezioni rappresentano una media del contenuto di ogni sostanza e si riferiscono a 100 ml in 100 g di prodotto. Le barrette di cereali sono costituite da un mix eterogeneo di ingredienti (noci, uvetta, fiocchi d’avena, ecc..) pertanto è necessaria una completa omogeneizzazione del campione per ottenere risultati d’analisi significativi.
  • Mulino a taglienti SM 300 – Affinamento di un sistema di macinazione ben affermato

    I mulini a taglienti vengono utilizzati in diverse aree della preparazione dl campione alle analisi successive. Tipiche applicazioni includono la riduzione di combustibili da rifiuto, la macinazione di campioni di biomasse per ricerche nell’ambito delle energie rinnovabili, il controllo dei prodotti nell’abito delle normative RoHS and WEEE, o nel recupero dei materiali preziosi – la varietà di campione è notevole.
  • Setacciatura di polveri agglomerate con il setacciatore a getto d’aria AS 200 jeting machine AS 200 jet

    Il setacciatore a getto d’aria viene utilizzato principalmente per la setacciatura di materiali secchi con particelle di dimensioni inferiori ai 40 micron. Può comunque essere un’alternativa rapida alla classica setacciatura fino a 250 micron.
  • Utilizzo del Cryomill per campioni con componenti volatili

    Per la riduzione di dimensioni di molti materiali è consigliabile utilizzare un mulino criogenico invece di un mulino che opera a temperature ambiente. Il campione viene infragilito con l'azoto liquido che migliora il suo comportamento di rottura quando viene sottoposto a impatto, pressione e attrito. Inoltre, in questo modo vengono conservati i componenti volatili del campione. Il mulino Cryomill non solo è il mulino criogenico più sicuro e moderno sul mercato ma fornisce anche eccellenti risultati di macinazione.
  • Air Jet Sieving of Bulk Materials

    Particle size analysis and particle size distribution are important criteria for the quality control of bulk materials. In a running production process, the results of a quality check must be available quickly to allow for immediate adjustment of the production parameters. Depending on the expected particle size and sample volume, different sieving methods and sieving machines are suitable for analysis. The method used for particle size analysis is primarily determined by the fineness of the material to be sieved. For dry sieving of samples with particle sizes below 40 microns, air jet sieving is the method of choice.
  • Contamination-free cutting of raw materials for the food and medical industries with the new SM 300 foodGrade

    Raw materials for the food or pharma industry often require a size reduction process to minimize the particle size (tea, herbs, spices). The materials can be ready for consumption, like tea, or they are used for a second processing step, like extraction of valuable ingredients. A current example is CBD oil extraction from ground cannabis plants. For both – direct use or process step prior to extraction, the specific requirements of the food and medical industries must be considered when choosing a suitable size reduction tool. Aspects like smooth surfaces, easy cleaning, and available materials like stainless steel 316L to ensure contamination-free processing should be taken into account. Retsch has launched the new Cutting Mill SM 300 foodGrade for this type of applications and small-scale production of herbs and spices.
  • Food samples - perfect homogenization with the knife mill GRINDOMIX GM 200

    The diversity of foodstuffs with their often very different properties represents a challenge for food testing laboratories. Before the actual analysis, the sample materials need to be homogenized and reduced to a sufficiently small particle size. The Knife Mill GRINDOMIX GM 200 sets standards in food sample preparation: The cutting effect produced by the steel blades results in the perfect homogenization of samples with high water, oil, sugar or fat content.
  • Food samples - safe and efficient cryogenic grinding

    Most sample materials can be ground to the required analytical fineness at room temperature. However, there are limits, for example when even a small temperature increase affects the sample in a negative way; or when the material is very elastic and will only be deformed. Moreover, food samples which are fatty or sticky may block the mill. Therefore, cryogenic grinding is the best way to pulverize food samples like cheese, raisins, wine gum or marzipan which simply clump together when ground at room temperature.
  • Genetically modified organisms (GMO) - detection in food and feed samples

    Genetic engineering opens up new possibilities in areas such as medical research, development of alternative fuels or global food supply. It is used to modify the characteristics of plants in order to increase the crop yield, improve defense against predators, pesticides or draught, but also increase concentrations of essential vitamins. However, with regards to food the use of genetic engineering is a fairly controversial issue.
  • Measuring Dust - Incoming Inspection with Sieve Analysis

    Graduate student Jennifer Franz has developed a new inspection procedure during her work at the German food producer Lebensgarten GmbH. With the help of sieve analysis the company can now reliably ascertain the fines and dust fractions of incoming cereal flakes; these have a negative influence on the mixing and packaging process of muesli.
  • 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.
  • Quick and reproducible grinding of feedstuff

    Grain, compound feeds or feed pellets occur in a variety of forms; compound feeds are usually inhomogeneous. Feedstuff is analyzed, for example, to determine the nutritional value, to detect hazardous substances or genetically modified ingredients. To ensure meaningful and reliable analysis results, representative and homogeneous samples are required. Therefore, sample preparation involves homogenization and size reduction of the material to a defined particle size. RETSCH laboratory mills are perfectly suited for this process.
  • 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.
  • Reproducible and convenient sample preparation for reliable food analysis

    Reliable analytical results can only be guaranteed if the entire sample preparation process is reproducible. A well-known standard in sample preparation of foodstuffs are ultra-centrifugal mills, which are used for rapid pulverization of soft, medium-hard, brittle and fibrous food. Retsch’s latest model, the ZM 300, offers decisive advantages for food analysis such as temperature monitoring for temperature-sensitive materials, improved sample throughput and well-thought-out handling for particularly ergonomic working.
  • Reproducible and reliable sample preparation

    In the book "Ideas and Applications Toward Sample Preparation for Food and Beverage Analysis," (ISBN 978-953-51-3686-6), edited by Mark T. Stauffer, RETSCH has published a chapter on reliable sample preparation of food samples. This chapter describes the process of turning a laboratory sample into a representative part sample with homogeneous analytical fineness by choosing the most suitable mill. Important aspects of size reduction and homogenization are explained, a variety of application examples is given, and specific applications such as cryogenic grinding are discussed in detail.
  • Sample Division of Large Volumes

    Representative sampling of large sample volumes is an integral part of the physical and chemical analysis of bulk goods and has a decisive influence on the quality of the results. Extraction of a sample from the bulk is not always carried out in a way to ensure representativeness. This is a widespread flaw in the quality control process with a negative impact on the subsequent analysis results. RETSCH provides some convenient solutions which help to improve working conditions and thereby the quality of the sampling process.
  • Sticky, tough, moist – cryogenic homogenization of food samples

    The homogenization of food samples is a crucial step prior to the actual analysis. Due to the various properties of food – dry, moist, sticky, tough, hard, soft, etc. – a versatile laboratory mill is required to ensure reproducible preparation of the analytical sample. RETSCH’s knife mill GRINDOMIX GM 200 is employed in laboratories all over the world for the homogenization of food samples as well as samples with a high water, oil, sugar or fat content. This mill covers a wide application range, from granular products like rape seed, rice, soybeans to fibrous or tough samples like meat, fish, candy, cheese or plants.

Referenze (7)

Test Reports (137)