ISO 5506:1988

Soya bean products — Determination of urease activity

Publication date: 18 gush 1988

95.99 Withdrawal of Standard 10 korr 2018

General information

Current stage: 95.99 Effective date: 10 korr 2018

Originator: ISO

Owner: ISO/TC 34/SC 2

Type: International Standard

ICS: 67.200.20

Gjuha: frëngjisht anglisht

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Statusi: Shfuqizuar

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Scope

The method allows inadequate cookingof the products to be detected. It applies to products having a urease activity of less than 1 mg of nitrogen per gram of product as received. For more active products the mass of test may be reduced. The principle consists in mixing of a ground test portion with a buffered urea solution, after keeping the mixture for 30 min at 30 C, neutralization of the ammonia liberated, with an exess of hydrochloric acid solution, and back-titration with standard volumetric hydroxide solution.