Chemie a potravinářství

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 302 (Milk and milk products - Methods of sampling and analysis)
Původce: CEN
K připomínkám do: 9.03.2020
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This International Standard specifies a method for the quantitative determination of total iodine in infant formula and adult and pediatric nutritional formula[1]. The method is applicable to the measurement of total iodine in infant formula and adult and pediatric nutritional formula from 4 µg/100 g to 1 500 µg/100 g reconstituted final product and for ready to feed products from 2,5 µg/100 g to 1 000 µg/100 g using ICP-MS. The method has been validated in an interlaboratory study at levels ranging from 1,24 µg/100 g to 18,5 µg/100 g.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 13.03.2020
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This document specifies the general principles of rotational and oscillatory rheometry. Detailed information is presented in Annex A.

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 327 (Animal feeding stuffs: Methods of sampling and analysis)
Původce: CEN
K připomínkám do: 16.03.2020
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This document defines general rules for the enumeration of lactobacilli in feedingstuffs (additives, premixtures and compound feeds excluding mineral feeds) that contain lactobacilli as a single microorganism component or in a mixture with other microorganisms. Applying the method to compound feeds with critical amounts of copper demands a special procedure (see Annex A). The document is not applicable to mineral feeds, which are defined as complementary feeding stuffs composed mainly of minerals and containing at least 40 % crude ash (Regulation R767/2009) [3].

There are different categories of feed samples:

a)     Additives containing about 1010 colony forming units (CFU)/g;

b)    Premixtures containing about 1011 CFU/kg;

c)     Compound feeds, meal or pellets, which contain about 109 CFU/kg.

The detection limit is defined in EN ISO 7218.

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 327 (Animal feeding stuffs: Methods of sampling and analysis)
Původce: CEN
K připomínkám do: 16.03.2020
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This document defines general rules for the enumeration of Saccharomyces cerevisiae in feeding stuffs (additives, premixtures and compound feeds excluding mineral feeds) that contain Saccharomyces cerevisiae as a single microorganism component or in a mixture with other microorganisms. Applying the method to compound feeds with critical amounts of copper demands a special procedure (see Annex A). The document is not applicable to mineral feeds, which are defined as complementary feeding stuffs composed mainly of minerals and containing at least 40 % crude ash (Regulation R767/2009) [3].

There are different categories of feed samples:

a)     Additives containing about 1010 (colony forming units) CFU/g;

b)    Premixtures containing about 1011 CFU/kg;

c)     Compound feeds, meal or pellets, which contain about 109 CFU/kg.

The detection limit is defined in EN ISO 7218.

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 327 (Animal feeding stuffs: Methods of sampling and analysis)
Původce: CEN
K připomínkám do: 16.03.2020
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This documentdefines general rules for the enumeration of bacilli in feeding stuffs (additives, premixtures and compound feeds including mineral feeds) that contain bacilli as a single microorganism component or in a mixture with other microorganisms. There are different categories of feed samples:

a)     Additives containing about 1010 colony forming units (CFU)/g;

b)    Premixtures containing 1011 CFU/kg;

c)     Compound feeds, meal or pellets which contain about 109 to 1010 CFU/kg.

The detection limit is defined in EN ISO 7218.

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 327 (Animal feeding stuffs: Methods of sampling and analysis)
Původce: CEN
K připomínkám do: 16.03.2020
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This document defines general rules for the enumeration of pediococci in feeding stuffs (additives, premixtures and compound feeds excluding mineral feeds) that contain pediococci as a single microorganism component or in a mixture with other microorganisms. Applying the method to compound feeds with critical amounts of copper demands a special procedure (see Annex A). The document is not applicable to mineral feeds which are defined as complementary feeding stuffs composed mainly of minerals and containing at least 40 % crude ash (Regulation R767/2009) [3].

There are different categories of feed samples:

a)     Additives containing about 1010 (colony forming units) CFU/g;

b)    Premixtures containing  about 1011 CFU/kg;

c)     Compound feeds, meal or pellets, which contain about 109 CFU/kg.

The detection limit is as defined in EN ISO 7218.

Oblast zaměření: Produkty z biomasy
Komise : CEN/TC 454 (Algae and algae products)
Původce: CEN
K připomínkám do: 16.03.2020
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This document specifies a method for the detection and identification of microalgae, macroalgae (seaweed), cyanobacteria and Labyrinthulomycetes by using morphological methods and/or molecular methods.

The morphological methods in this document are applicable to harvested wet biomass and to harvested dried unground biomass from microalgae, macroalgae, cyanobacteria and Labyrinthulomycetes that have been grown and/or harvested for further processing and/or use.

The molecular methods in this document are applicable to harvested wet biomass and to harvested dried and/or ground biomass from microalgae, macroalgae, cyanobacteria and Labyrinthulomycetes that have been grown and/or harvested for further processing and/or use.

This document describes a toolbox, consisting of several identification methods that can be chosen according to the applicability and purpose of the identification:

—    morphological methods based on observation and referring to scientific literature on taxonomy:

—    macroscopic observation;

—    light microscopic observation;

—    molecular methods of sequencing and blasting of sequences:

—    16S-rDNA sequencing;

—    18S-rDNA sequencing;

—    rbcL DNA sequencing;

—    ITS sequencing;

—    COX 1 gene sequencing;

—    tufA gene sequencing.

This document does not deal with genetic purity of the biomass or quantification of the identified taxa.

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 327 (Animal feeding stuffs: Methods of sampling and analysis)
Původce: CEN
K připomínkám do: 16.03.2020
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This document defines general rules for the enumeration of enterococci (E. faecium) in feedingstuffs (additives, premixtures and compound feeds excluding mineral feeds) that contain enterococci as a single microorganism component or in a mixture with other microorganisms. Applying the method to compound feeds with critical amounts of copper demands a special procedure (see Annex A). The document is not applicable to mineral feeds which are defined as complementary feeding stuffs composed mainly of minerals and containing at least 40 % crude ash (Regulation R767/2009) [4].

There are different categories of feed samples:

a)     Additives containing about 1010 colony forming units (CFU)/g;

b)    Premixtures containing 1011 CFU/kg;

c)     Compound feeds, meal or pellets which contain about 109 CFU/kg;

The detection limit is defined in EN ISO 7218.

Oblast zaměření: Potravinářské produkty
Komise : CEN/SS C01 (Food Products)
Původce: CEN
K připomínkám do: 23.03.2020
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This International Standard gives guidelines for monitoring and assessing the overall performance of a quantitative descriptive panel and the performance of each member.

A panel of assessors can be used as an instrument to identify products’ sensory attributes and to assess the magnitude of sensory attributes.

Performance is the measure of the ability of a panel or an assessor to make reliable and valid attribute assessments across the products being evaluated. It can be monitored at a given time point or tracked over time. Performance comprises the ability of a panel to detect, identify, and measure an attribute, use attributes in a similar way to other panels or between assessors within a panel, discriminate between stimuli, use a scale properly, repeat their own results, and reproduce results in comparison to other panels or assessors.

The methods specified allow to monitor and assess the consistency, repeatability, freedom from bias and the ability of discrimination of panels and assessors. Monitoring and assessment can be carried out in one session or over time.

Monitoring performance data enables the panel leader to improve panel and assessor performance, to identify issues and retraining needs or to identify assessors who are not performing well enough to continue participating.

The methods specified in this International Standard can be used, in full or a selection only, by the panel leader to appraise continuously the performance of panels or individual assessors. The methods listed are not exhaustive and other appropriate methods may also be used.

This International Standard applies to individuals or panels in training as well as for established panels.

Komise : CEN/TC 298 (Pigments and extenders)
Původce: CEN
K připomínkám do: 24.03.2020
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This document specifies requirements and corresponding methods of test for precipitated silica.

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 7.04.2020
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This document specifies general terms and definitions that are used in the context of rotational and oscillatory rheometry.

Other terms and definitions can be found in the other parts of the standards series where they are used.

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 307 (Oilseeds, vegetable and animal fats and oils and their by-products - Methods of sampling and analysis)
Původce: CEN
K připomínkám do: 7.04.2020
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This document specifies a titrimetric method for the determination of acid value in light coloured Fatty Acid Methyl Esters, hereinafter referred as FAME.

It allows the determination of acid value within a range of 0,10 mg KOH/g to 1,00 mg KOH/g.

NOTE          For the purposes of this document, the terms “% (m/m)” and “% (V/V)” are used to represent respectively the mass fraction and the volume fraction.

WARNING — The use of this document can involve hazardous materials, operations and equipment. This document does not purport to address all of the safety problems associated with its use. It is the responsibility of users of this document to take appropriate measures to ensure the safety and health of personnel prior to the application of the standard, and to determine the applicability of any other restrictions for this purpose.

Komise : CEN/TC 298 (Pigments and extenders)
Původce: CEN
K připomínkám do: 24.04.2020
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This document specifies requirements and corresponding methods of test for fumed silica.