Standard No.:	GB 5413.13-2010
Chinese Name:	食品安全国家标准 婴幼儿食品和乳品中维生素B6的测定
English Name:	National food safety standard Determination of vitamin B6 in foods for infants and young children,milk and milk products
Professional Classification:	X09
Professional Classification:	GB National Standard
Issued by:
Issued on:	2010-03-26
Implemented on:	2010-06-01
Status:	ABOLISHED
Replace:	GB5413.13-1997
Replace By:	GB5009.154-2016
Replace By Date:
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	120 (USD)
Delivery:	via email in 1-3 business day

1 Scope

This standard specifies the determination method for urease in foods and milk products for infants and young children.
This standard is applicable to qualitative determination of urease in foods and milk products for infants and young children.

2 Principle

Under proper PH value and temperature, urease catalyzes urea into ammonium carbonate, which produces ammonium hydroxide under alkaline conditions, which produces brown ammonium iodide double mercury by reacting with mercury potassium iodide double salt in Nessler's reagent.

3 Reagents and Materials

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