Structure of a grain

Structure of a grain

Structure of a grain

The cereal grain is rich in ingredients, most of which are essential for our body. It includes carbohydrates, proteins and fats – the three macronutrients. In addition, cereals contain both micronutrients (vitamins and minerals) and secondary plant compounds. In today’s article you will learn which nutrients are found in which part of the grain.

In general, a cereal grain consists ofGrain structure

  • one germ (5 %)
  • a flour body (approx. 80 %) and
  • the marginal layers, which include the fruit and seed coats and the aleurone layer (15%). [1]

The endosperm [2]

The endosperm, also called the endosperm, is the largest part of the grain in terms of quantity and weight. It is composed of starch bodies with adhesive proteins between them and delineated by fiber-rich[3] cell partitions. The entire endosperm is surrounded by the so-called aleurone layer. This is composed of proteins and oils and is rich in B vitamins, as well as vitamin E. The endosperm is an energy store that nourishes the germ – especially when it germinates.

The cereal germ and the marginal layers

The germ and marginal layers are rich in vitamins and minerals, they contain fatty acids, including essential linoleic and alpha-linolenic acids, and high-quality protein.” [4] The marginal layers protect the grain – but especially the germ. This is also the reason why they are very rich in fiber.

We have summarized for you which vitamins are found in cereals.
In another blog post.
summarized for you. And also to the
secondary plant substances
you will find interesting information on our blog. Have fun reading!


[1] Rittenau, N. (2019): Goodbye vegan cliché! Scientific answers to critical questions about vegan nutrition. Mainz: Ventil Verlag UG & Co. KG, p. 238

[2] Rittenau, N. (2019): P. 238; Münzing-Ruef, I. (2000): Course book healthy eating. The kitchen as nature’s pharmacy. Munich: Wilhelm Heyne Verlag, p. 301; Koerber, K., Männle, T., Leitzmann, C. (2004): Whole food nutrition : conception of a contemporary and sustainable diet. Stuttgart: Haug, p. 244

[3] What dietary fiber is and how it works in the body, you can read in
learn about this post >>

[4] Koerber, K., Männle, T., Leitzmann, C. (2004): S. 244

Figure: (10.03.2020)

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