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Standard ČSN 560051 14.9.1987 preview

ČSN 560051 (560051)

Determination of niacin (nicotine acid)



STANDARD published on 14.9.1987


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7.90 USD

The information about the standard:

Designation standards: ČSN 560051
Classification mark: 560051
Catalog number: 29396
Publication date standards: 14.9.1987
SKU: NS-130454
The number of pages: 12
Approximate weight : 36 g (0.08 lbs)
Country: Czech technical standard
Category: Technical standards ČSN

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Food products in general

Annotation of standard text ČSN 560051 (560051):

Norma platí pro zkoušení poživatin a určuje metodu stanovení niacinu (kyseliny nikotinové) v potravinách a zemědělských a potravinářských surovinách. Metoda se používá k mikrobiologickému stanovení s citlivostí cca > 1 mg niacinu na kg. Podstata metody: Niacin se uvolní z potravinového materiálu v prostředí zředěné kyseliny sírové tepelnou extrakcí za zvýšeného tlaku. Vhodně zředěný vzorek se napipetuje do zkumavek o stoupající koncentraci. Doplní se vodou, testovací půdou, popř. i standardním přídavkem kyseliny nikotinové. Po sterilizaci se zaočkují zkumavky kmenem Lactobacillus plantarum. Po inkubaci v termostatu se titračně stanoví množství kyselin, produkovaných při růstu testovacího mikroorganismu. Výsledky se vypočtou z kalibrační křivky a metodou standardního přídavku. Postup při provádění normalizované zkoušky je podrobně popsán. Hodnocení výsledků uvedeno není. Norma tedy stanovuje některé kvalitativní znaky (jakosti) významné pro hygienu výživy, resp. metody jejich zjišťování (ověřování). ČSN 56 0051 byla schválena 14.9.1987 a nabyla účinnosti od 1.9.1988. Nahradila ČSN 56 0051 z 11.3.1969

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