Stocking (grain)

Contaminants are called unwanted components of a grain batch . Depending on the type of grain ( wheat , barley , maize, etc.) and intended use (seed grain, bread grain, fodder grain), the definition and permissible proportion of the stock vary.

Contaminants must be removed before storage or grinding because they:

1. is harmful or even poisonous (e.g. ergot , weed seeds such as easter egg , hemlock )
2. increases the mineral content (e.g. clods of earth, weed seeds)
3. increases the moisture content (e.g. weed seeds)
4. Causes color changes in flour and baked goods (e.g. grain wheels )
5. Damages machines or systems (e.g. stones, metal parts)
6. is nauseating (e.g. animal infestation, feces)
7. unnecessarily used storage space

The stock content (in%) is determined by means of a stock analysis . A distinction is made between grain contamination, black contamination (also called "foreign contamination") and animal infestation.

For grain impurities include

• Schmachtkorn (also called "Kümmerkorn", not fully developed grains <2 mm thick)
• Broken grain (damaged grain with exposed flour core)
• Grains sprouted
• Foreign grain (seeds from other grain crops)
• Pest feeding (grains that have been eaten by rodents or punctured by insects)
• Grains with germ discoloration and
• grains overheated by drying.

As Black Facing apply

• spoiled grains
• Weed seeds (toxic / non-toxic)
• Ergot
• Fire hips
• Impurities (dust, stones, metal parts, straw) and husks

Animal infestation

• insects
• Insect parts

literature

• Meinolf Georg Lindhauer, Klaus Lösche and Thomas Miedaner (eds.): Goods knowledge of grain - ingredients, analysis, cleaning, drying, storage, marketing, processing , Agrimedia, 7th edition, Clenze 2017, ISBN 978-3-86263-003-5 .

Individual evidence

1. ^ Burghard Kirsch: Milling technology, materials science. Composition, study, evaluation and use of grain and grain products . 8th edition. Bayerischer Müllerbund, Munich 2016, ISBN 978-3-9812436-6-6 .
2. ↑ ICC Standard No. 102 for Wheat (English) ( Memento of the original from October 20, 2012 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. .