# ISO 5506:1988 — Withdrawn and superseded ISO standards

For ISO 5506:1988, item title is Soya bean products — Determination of urease activity; status code is 9599; successor is ISO 5506:2018; withdrawn / published date is 1988-08-18, recorded from its source on 2026-08-05.

- **Identifier:** ISO 5506:1988 _(verified: appears in the quote below)_
- **Item title:** Soya bean products — Determination of urease activity _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 5506:2018
- **Withdrawn / published date:** 1988-08-18 _(verified: appears in the quote below)_

## What the source says

> 11554,IS,,ISO 5506:1988,Soya bean products — Determination of urease activity,Produits dérivés du soja — Détermination de l'activité uréasique,1988-08-18,2,['67.200.20'],ISO/TC 34/SC 2,9599,[11553],[75602],"['en','fr']",2,"<p>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-titrati

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).