# ISO 5549:1978 — Withdrawn and superseded ISO standards

For ISO 5549:1978, item title is Caseins and caseinates — Determination of protein content (Reference method); status code is 9599; successor is ISO/PWI 5549 | ISO 8968-1:2014; withdrawn / published date is 1978-06-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 5549:1978 _(verified: appears in the quote below)_
- **Item title:** Caseins and caseinates — Determination of protein content (Reference method) _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/PWI 5549 | ISO 8968-1:2014
- **Withdrawn / published date:** 1978-06-01 _(verified: appears in the quote below)_

## What the source says

> 11615,IS,,ISO 5549:1978,Caseins and caseinates — Determination of protein content (Reference method),Caséines et caséinates — Détermination de la teneur en protéines (Méthode de référence),1978-06-01,1,['67.100.99'],ISO/TC 34/SC 5,9599,,"[39611,61020]","['en','fr']",3,"<p>Does not apply to caseins and caseinates containing ammonium caseinate or other ammonium compounds, or other nitrogenous nonprotein compounds. The principle of determination consists in digesting a test portion with a mixture of potassium sulphate and sulphuric acid, in the presence of copper(II) sulphate as catalyst, to convert organic nitrogen into ammoniacal nitrogen, distilling and absorbing the ammonia in boric acid so

## 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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).