Chemie a potravinářství

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 327 (Animal feeding stuffs: Methods of sampling and analysis)
Původce: CEN
K připomínkám do: 11.07.2022
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This document specifies a method for the determination of individual intact glucosinolates in oilseeds, oilseed products and complete feeds by high performance liquid chromatography (HPLC) coupled with tandem mass spectrometry (MS/MS).

The method described in this document has been successfully validated by collaborative trial in the following matrices: rape seed, camelina seed, Brassica oleracea seeds, mixed oilseeds, rape seed flakes, compound feed for bovine, porcine and poultry.

The method is applicable for the quantitative determination of epiprogroitrin, glucoalyssin, glucoarabin, glucobrassicanapin, glucobrassicin, glucocamelinin, glucoerucin, glucoiberin, gluconapin, gluconapoleiferin, gluconasturtiin, glucoraphanin, glucoraphenin, glucotropaeolin, homoglucocamelinin, 4-hydroxyglucobrassicin, 4-methoxyglucobrassicin, neoglucobrassicin, progoitrin, sinalbin and sinigrin.

The concentration ranges tested in the collaborative trial for each individual glucosinolate and for the total glucosinolate content are summarized in Table 1.

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 275 (Food analysis - Horizontal methods)
Původce: CEN
K připomínkám do: 11.07.2022
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This document specifies a method for the determination of Ag, As, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Se, Tl, U and Zn in foodstuffs by ICP-MS after pressure digestion.

The following foodstuffs were analysed for the elements listed in Table 1 in an interlaboratory study: Banana (deep-frozen), Cocoa powder, Wheat noodle powder, Currant nectar (deep-frozen), Milk powder, Oyster (dried), Celery (dried), Dogfish liver (dried), Liver (deep-frozen), Kale (dried).

Komise : CEN/TC 139 (Paints and varnishes)
Původce: CEN
K připomínkám do: 11.07.2022
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This document describes the procedure for determining objectively the chalking resulting from natural or artificial weathering of an organic coating on a metallic substrate.

The advantage of this procedure for measuring chalking of an organic coating is that the result can be read off immediately on an instrument. Subjective judgement by visual comparison of test specimens with reference specimens is not necessary.

Reproducible results can only be obtained by careful execution of the test. Special attention is paid to the adhesive tape and its application to the test surface.

The test method is not applicable to embossed coatings. In the case of textured coatings, the degree of texture will influence readings. Also, dirt collection can influence readings on outdoor weathered specimens.

NOTE          Different methods for assessing chalking are in use. The results of these different methods are not comparable.

Oblast zaměření: Potravinářské produkty
Komise : CEN/TC 275 (Food analysis - Horizontal methods)
Původce: CEN
K připomínkám do: 1.08.2022
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This document specifies minimum performance requirements for methods that quantify the food allergens milk, egg, peanut, hazelnut, almond, brazil nut, macadamia nut, cashew, pistachio nut, walnut, pecan nut, lupine, sesame, mustard, soy, celery, fish, molluscs, crustaceans, and wheat in raw and processed foodstuffs. Within the scope of this document, minimum requirements for an LOQ (Limit of Quantification) will be derived from threshold data of allergic consumers. For quantitative antibody-based methods, a normative annex will describe what specific information the method developer needs to deliver and how performance characteristics shall be validated. Regarding PCR and LC-MS/MS, information on performance characteristics are in parts covered by EN 15634‑1 and EN 17644[1]. This document does not apply to fragmented or hydrolysed food allergens, such as casein hydrolysates or soy sauce. It also does not apply to methods that deliver qualitative results only. Methods that cover gluten-containing cereals (wheat, rye, and barley) with regard to coeliac disease are covered by EN 17254.

 

[1] Under preparation. Stage at the time of publication: FprEN 17644:2022.

Oblast zaměření: Hnojiva
Komise : CEN/TC 260 (Fertilizers and liming materials)
Původce: CEN
K připomínkám do: 8.08.2022
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This document specifies a method for the determination of phosphorus in fertilizer extracts.

The method is applicable to all extracts of fertilizers for the determination of the different forms of phosphorus as phosphorus soluble in mineral acids, water-soluble phosphorus, phosphorus soluble in solutions of ammonium citrate, phosphorus soluble in 2 % citric acid and phosphorus soluble in 2 % formic acid.

The method has only been validated on inorganic fertilizers but can be applicable to all extracted phosphorous if proper extraction methods are used.