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ISO/DIS 25300

Soil conditioners and beneficial substances — Determination of free amino acids ISO/DIS 25300

General information

40.60   Close of voting   Jan 7, 2026

ISO

ISO/TC 134 Fertilizers, soil conditioners and beneficial substances

International Standard

65.080   Fertilizers

Scope

This document specifies the methods for determining the content of free amino acids in fertilizers, including the use of automatic amino acid analyzers, pre-column derivatization followed by high-performance liquid chromatography and high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS). These methods are applicable to the following amino acids: Asparagine Tryptophan, Glutamine, Theanine, Aspartic acid, Threonine, Serine, Glutamic acid, Proline, Glycine, Alanine, Valine, Methionine, Isoleucine, Leucine, Tyrosine, Phenylalanine, Histidine, Lysine, Arginine, and Cysteine.

Life cycle

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ISO/DIS 25300
40.60 Close of voting
Jan 7, 2026




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