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ISO 3188:1978

Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Titrimetric method

Aug 1, 1978

General information

90.93     Mar 25, 2025

ISO

ISO/TC 93

International Standard

67.180.20  

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Scope

The found value only includes free amino acids, compounds producing amino acids on hydrolysis and ammonium compounds. The principle consists in destruction of organic matter by sulphuric acid in the presence of a compound catalyst (see ISO 1871), alkalization of the reaction products, distillation of the liberated ammonia and collection in a boric acid solution, followed by titration with a standard volumetric sulphuric acid solution. The method applies to contents greater than 0,01 % (m/m). For products with contents less than 0,025 % (m/m), see ISO 5378.

Life cycle

NOW

PUBLISHED
ISO 3188:1978
90.93 Standard confirmed
Mar 25, 2025

National adoptions

SRPS ISO 3188:2002  
ISS

Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Titrimetric method (ISO 3188:1978)

95.99   Withdrawal of Standard

E034-4 more

SRPS EN ISO 3188:2008  
ISS

Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Titrimetric method (ISO 3188:1978)

90.93   Standard confirmed

E034-4 more