Norm

NEN-EN 15652:2007 Ontw. en

Voedingsmiddelen - Bepaling van niacine door HPLC

  • Deze norm is ingetrokken sinds 18-06-2009

23,50

Over deze norm

Status Ingetrokken
Aantal pagina's 19
Commissie Vitamines en carotenoïden
Gepubliceerd op 01-04-2007
Taal Engels
This draft European Standard specifies a method for the determination of the mass fraction of niacin in foodstuffs by high performance liquid chromatography (HPLC) by three different ways of hydrolysis. Acid hydrolysis (A), enzymatic hydrolysis (B) or acid/alkaline hydrolysis (C). A and B give similar results for niacin. In options A and B niacin is calculated as the sum of nicotinamide and nicotinic acid, and expressed as nicotinic acid [1]. Option C gives higher results than A and B for niacin with non-supplemented cereals, but similar results for other products. In option C, niacin is calculated and expressed as nicotinic acid after transformation of nicotinamide into nicotinic acid [2]. Option A is faster and cheaper than B and C. Option B is used if an exact quantification of nicotinamide and nicotinic acid is needed. This can not be done with option A, because there is a slight transformation of nicotinamide into nicotinic acid during the acid hydrolysis. Option C can be useful for non-supplemented cereals. Because in that specific case it has been shown that the alkaline hydrolysis is able to liberate other forms giving higher results for niacin. Information on a comparison between the three different ways of hydrolysis is given in Annex C.

Details

ICS-code 67.050
Nederlandse titel Voedingsmiddelen - Bepaling van niacine door HPLC
Engelse titel Foodstuffs - Determination of niacin by HPLC
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