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Influence of Bran Particle Size in Einkorn Flours: Effects on the Gluten Matrix and Dough Properties

by luciano

Highlights:

1️⃣ Einkorn (Triticum monococcum) possesses a predominantly visco-colloidal dough matrix, due to the greater prevalence of gliadins compared to polymeric glutenins, which results in doughs that are less elastic and more viscous than those of modern wheat.

2️⃣ Bran particle size represents a crucial technological parameter in wholegrain flours, influencing water absorption, dough cohesion and fermentation stability.

3️⃣ In einkorn, an intermediate bran particle size may have a structuring effect on the dough, acting as a colloidal filler within the matrix and contributing to the stabilization of gas bubbles during fermentation.

4️⃣ Genetic variability among einkorn genotypes significantly influences technological quality, with relevant differences in dough behavior, bread volume and final aromatic profile.

5️⃣ Some einkorn lines show relatively lower gluten immunogenicity compared to hexaploid wheats, although they are not suitable for the diet of celiac patients. However, they may be useful for certain individuals (see end of chapter 11).

1. Introduction

Einkorn wheat (Triticum monococcum) represents one of the oldest wheat species cultivated by humans and possesses technological characteristics that differ significantly from those of modern wheats. In particular, the rheological properties of einkorn flours differ substantially from those of modern bread wheat, especially with regard to the structure and behavior of the gluten matrix.

The protein composition of einkorn is characterized by a relative predominance of gliadins (including γ-gliadins) and by a lower quantity and quality of polymeric glutenins. Gliadins mainly contribute to the viscous properties of the dough, while polymeric glutenins are responsible for elastic properties and for the formation of a stable three-dimensional gluten network.

This specific protein composition results in a rheological system in einkorn that behaves predominantly as a pasty-viscous system rather than an elastic one (Figure 1). Consequently, doughs obtained from einkorn flours are generally less elastic, more viscous and have a limited capacity to retain gas during fermentation.

Scientific references

Wieser, H. (2007). Chemistry of gluten proteins. Food Microbiology. DOI: 10.1016/j.fm.2006.07.004

Abdel-Aal, E.-S. M. et al. (1998). Genetic and environmental effects on gluten proteins of einkorn wheat. Journal of Cereal Science. DOI: 10.1006/jcrs.1997.0143

2. Role of Bran in Dough: General Concepts

Bran represents a fundamental component of wholegrain flours and can significantly influence the rheological properties of dough and the quality of the final product. The effect of bran on dough is generally attributed to two main mechanisms: interaction with water and mechanical interference with the dough structure.

2.1 Water absorption effect

Bran particles possess a remarkable capacity to absorb water due to their high content of dietary fiber, particularly arabinoxylans and cellulose. As the specific surface area of bran particles increases, their capacity to bind water also increases.

✅ This phenomenon results in a reduction of water available for other dough components, particularly starch and gluten proteins. Consequently, the distribution of water in the dough can significantly modify the formation and stability of the protein matrix.

2.2 Mechanical effect of bran particles

In addition to the water-related effect, bran can exert a mechanical effect on the dough structure. Bran particles of large size may act as discontinuous elements within the dough matrix, interfering with the continuity of the gluten network.

In modern wheats, characterized by a relatively strong and elastic gluten network, coarse bran particles can physically interrupt the protein network, resulting in a reduced ability of the dough to retain gas and, consequently, a decrease in final bread volume.

References

Noort, M. W. J. et al. (2010). The effect of particle size of wheat bran on bread quality. Journal of Cereal Science. DOI: 10.1016/j.jcs.2010.03.003

Hemdane, S. et al. (2016). Wheat bran in bread making: A critical review. Food Chemistry. DOI: 10.1016/j.foodchem.2015.09.092

3. Effect of Bran Particle Size on Dough Properties

The size of bran particles represents a particularly important technological parameter, as it influences both water absorption capacity and mechanical interaction with the dough structure.

3.1 Fine bran

Fine bran presents a high specific surface area. This results in a greater capacity to absorb water compared to larger particles.

In the presence of fine bran, the following are generally observed:

1️⃣ lower water availability for proteins and starch
2️⃣ higher water absorption by bran
3️⃣ more homogeneous distribution of particles in the dough.

From a technological point of view, these effects may lead to the formation of more viscous and compact doughs, with a more limited but generally more uniform development of dough structure.

3.2 Coarse bran

Bran with larger particle size presents a lower specific surface area and therefore tends to absorb less water during the initial phases of mixing.

However, larger particles may exert a stronger mechanical effect on the dough structure. In modern wheats this phenomenon may cause discontinuities in the gluten network, resulting in reduced dough stability and lower final bread volume.

4. Technological Specificity of Einkorn

In the case of einkorn, the effect of bran must be interpreted in light of the specific characteristics of its protein matrix.

As previously described, the gluten network of einkorn is generally weaker than that of modern wheats and does not form an equally developed continuous elastic structure. Dough behavior is dominated more by viscosity and colloidal cohesion phenomena rather than by a well-organized elastic gluten network.

✅ In this technological context, bran does not necessarily act as an element that breaks a strong gluten network, as occurs in modern bread wheat. However, it may still interfere with dough cohesion or contribute to the stabilization of the overall structure of the system.

References

Hidalgo, A. & Brandolini, A. (2014). Nutritional properties of einkorn wheat. Journal of the Science of Food and Agriculture. DOI: 10.1002/jsfa.6382

Brandolini, A. et al. (2008). Technological quality of einkorn wheat. Journal of Cereal Science. DOI: 10.1016/j.jcs.2008.01.001

5. Recent Evidence on the Technological Properties of Einkorn

Benefits of Products Made with Einkorn Wheat

by luciano

The research “Integrated Evaluation of the Potential Health Benefits of Einkorn-Based Breads” can be considered the first integrated evaluation of the potential health benefits, linked to the excellent nutritional properties, of using einkorn flour in bread and baked goods. It also highlights how using whole-wheat flour and sourdough is essential to achieve the best results in terms of exploiting the potential of this grain. The choice of this grain is well summarized in one passage of the research: “Einkorn (Triticum monococcum L. ssp. monococcum) is an ancient crop. Compared to polyploid wheats it has a higher content of proteins, polyunsaturated fatty acids, fructans, and phytochemicals as tocols, carotenoids, alkylresorcinols, phytosterols, and a lower α-, β-amylase and lipoxygenase activities [15]. In addition, einkorn expresses very few T-cell stimulatory gluten peptides [16]. Einkorn could represent a valid alternative for producing functional baked products” [In-depth analysis “A”].

Einkorn Wheat (Triticum monococcum): Key Characteristics – Concise Summary

Why einkorn wheat is considered the ancestor of all wheats
“Einkorn wheat (Triticum monococcum) is one of the oldest wheat species cultivated by humans. Domesticated more than 10,000 years ago in the Fertile Crescent, it represents the simplest form of wheat that has survived to the present day and is considered the genetic ancestor of modern wheats.”
The renewed scientific interest in einkorn wheat arises from the need to understand how modern genetic selection has profoundly altered contemporary wheats, from a nutritional, technological, and immunological perspective.

Botanical and genetic characteristics
“Triticum monococcum is a diploid wheat species (2n = 2x = 14), unlike durum wheat (Triticum durum) and common wheat (Triticum aestivum), which are tetraploid and hexaploid, respectively. Its simpler genome reflects a lower degree of artificial selection over millennia.”
Scientific clarification:
The genomic simplicity of einkorn makes it an important model for studying cereal evolution and for analyzing differences between ancient and modern wheats.
Editorial note:
The term “ancient grains” has no official botanical definition but is widely used in scientific and popular literature to describe cereal species and varieties that have undergone limited modern genetic improvement.

Gluten, digestion, and immunogenicity
“Comparative in vitro studies show that einkorn gliadin peptides are digested more efficiently during simulated gastrointestinal digestion than those from modern wheats, resulting in reduced immunogenicity in cellular models.”
Scientific clarification:
These findings indicate that the structure of einkorn gluten proteins differs from that of modern wheats and may be more readily degraded by digestive enzymes [In-depth analysis “B”].
“In individuals with wheat-dependent exercise-induced anaphylaxis (WDEIA), einkorn wheat did not elicit significant skin reactivity and showed a different IgE profile compared to common wheat, suggesting potential interest for the development of hypoallergenic foods.”
Scientific clarification:
These are preliminary results that require confirmation through larger clinical studies, but they open promising perspectives in research on reduced-allergenicity foods.
⚠️ Fundamental clarification
“To date, there is no sufficient scientific evidence demonstrating the safety of einkorn wheat for individuals with diagnosed celiac disease. Einkorn contains gluten and cannot be considered a gluten-free cereal.”
Further note:
Some individuals with non-celiac wheat sensitivity (NCWS) report better tolerance to einkorn wheat, but available clinical data remain still limited [In-depth analysis “C”].

Nutritional value and metabolic health
“Einkorn wheat generally contains higher levels of proteins, carotenoids, tocols, and other bioactive compounds compared to modern wheats, resulting in a particularly interesting nutritional profile.”
Scientific clarification:
The high carotenoid and antioxidant content contributes to the characteristic deep yellow color of einkorn flour and enhances its nutritional appeal.
“In an animal model (pig), consumption of einkorn wheat bread resulted in more moderate glycemic and insulin responses compared to common wheat bread, along with favorable modifications of the intestinal microbiota.”
Scientific clarification:
In particular, an increase in microorganisms producing short-chain fatty acids (SCFAs)—key compounds for intestinal mucosal health—was observed.

Technological aspects and baking performance
“Einkorn wheat flours exhibit lower gluten strength and a less elastic dough structure compared to modern wheats, making processing more delicate.”
Scientific clarification:
Recent studies show that the use of selected varieties, longer fermentation times, and adapted technological processes can yield bread and pasta with high nutritional and sensory quality even when made from einkorn wheat.

Conclusions
Einkorn wheat represents a bridge between the past and the future of human nutrition. Ancient in both history and genetics, it is nevertheless highly relevant today due to the strong scientific interest it attracts in nutritional, digestive, and technological research.
In upcoming articles, we will further explore the relationship between einkorn wheat, gluten, gut microbiota, and wheat sensitivity, always maintaining a clear distinction between established scientific evidence and hypotheses that are still under investigation.

In-depth analysis “A”: Integrated Evaluation of the Potential Health Benefits of Einkorn-Based Breads”
“Omissis…..Several studies have shown a clear correlation between the consumption of wholegrain and a reduced risk of cardiovascular diseases [1,2], diabetes [3], and some types of cancer [4]. The beneficial properties of wholegrain are mainly ascribed to their micronutrient and phytochemical content [5–7]. Cereals are among the richest food in phenolic acids, their content being comparable with or even higher than that found in berries, fruits, and vegetables [8]. In addition, some cereals are rich in lutein and zeaxanthin [9,10]. Micronutrients and phytochemicals are chiefly concentrated in the outer layers of grains [11], and this could explain the preventive effects associated with high wholegrain consumption [12]. Nowadays, the higher nutritional value of wholegrain compared to refined ones is recognized [13], and there is an increasing interest in ancient crops as source of wholegrain flours [14]. Einkorn (Triticum monococcum L. ssp. monococcum) is an ancient crop. Compared to polyploid wheats it has a higher content of proteins, polyunsaturated fatty acids, fructans, and phytochemicals as tocols, carotenoids, alkylresorcinols, phytosterols, and a lower α-, β-amylase and lipoxygenase activities [15]. In addition, einkorn expresses very few T-cell stimulatory gluten peptides [16]. Einkorn could represent a valid alternative for producing functional baked products. In bakery, processing could contribute to functionality [17,18]. Sourdough fermentation, involving the inter-relation between microbial metabolism and cereal enzymes, has been shown to greatly affect the functional features of leavened baked goods [19]. This type of fermentation may produce new nutritionally active molecules such as functional peptides and amino acid derivatives [20,21], deriving from either the bacterial hydrolytic activity [20] or from their own synthetic pathways [22]. To exert a positive action in the human body, bioactive compounds must be hydrolyzed from the food matrix, and be absorbed in the intestine. The bioaccessibility of bioactive compounds, i.e., the percentage released from the food matrix and made available for uptake by the intestinal mucosa, is an important parameter that can be influenced by many different factors including the food matrix and the food processing [23,24]. Fermentation by lactic acid bacteria may improve nutrient bioaccessibility and produce compounds with anti-oxidant and anti-inflammatory activity [19]. Sourdough lactic acid bacteria have been reported to release or synthesize antioxidant and anti-inflammatory peptides during fermentation of cereal flours [20]. Integrated Evaluation of the Potential Health Benefits of Einkorn-Based Breads. Fabiana Antognoni, et al. Nutrients November 2017.” The numbers in square brackets refer to the bibliographic references present in the text of the cited research”.

In-depth analysis “B”

Einkorn’s gluten proteins form a simpler, weaker, and more water-soluble network compared to modern wheat, due to its diploid genetics (14 chromosomes vs. modern 42) and a different gliadin-to-glutenin ratio (around 2:1 vs. modern wheat’s 7:1), resulting in shorter protein strands and less elasticity. This structure makes einkorn’s gluten more digestible and less inflammatory for many, despite having similar total gluten content, creating a tighter crumb in baked goods

In-depth analysis “C”

The 33-mer peptide, a fragment of wheat’s alpha-gliadin, is considered a highly potent immune stimulator, especially for celiac disease, because it’s resistant to digestion, contains multiple T-cell epitopes, and forms active nanostructures that trigger innate immune responses via Toll-like receptors (TLRs) in macrophages, leading to inflammation. This proteolytically stable peptide, often deamidated by tissue transglutaminase (TG2), binds strongly to HLA-DQ2 and activates T-cells, driving the autoimmune reaction in celiac disease.”

Bibliographic references

1. Shewry P.R., Hey S.J. The contribution of wheat to human diet and health. Food and Energy Security, 2015.
2. Geisslitz S. et al. Comparative analysis of in vitro digestibility and immunogenicity of gliadin proteins from durum and einkorn wheat. Food Chemistry, 2020.
3. Zoccatelli G. et al. Immunoreactivity of Triticum monococcum in patients with wheat-dependent exercise-induced anaphylaxis. Molecular Nutrition & Food Research, 2015.
4. Costabile A. et al. In vivo effects of einkorn wheat bread on glycemic response and gut microbiota in the pig model. Nutrients, 2018.
5 .Hidalgo A., Brandolini A. Nutritional properties of einkorn wheat. Journal of Cereal Science, 2014.
6. Foschia M. et al. Breadmaking performance of elite einkorn lines. Foods, 2023.
7. Immunogenicità di gliadine di monococco vs. durum: digestione enzymatica più efficace, meno immunogenicità in modelli T-cell. ([PubMed][2]) 2015
8. Glutine più digeribile nel piccolo farro in studi CNR: potenziale minore tossicità (CNR, “glutine digeribile”). ([Consiglio Nazionale delle Ricerche][7]) 2018
9. Struttura dell’impasto e qualità del pane: caratteristiche diverse rispetto al grano moderno. ([OUP Academic][8]) 2018.
10. Trasformazione genetica ed utilizzo come modello di studio cerealicolo (genoma piccolo e interessante). ([SpringerLink][1]) 2025
11. Recente review su antichi cereali e IBS (con riferimento a proprietà nutrizionali e immunogeniche). ([Springer Nature][9])

Einkorn wheat flour dough

by luciano

The dough for bread with einkorn wheat presents some difficulties due both to the fact that it is low in gluten and, above all, because it is a weak gluten that develops a limited gluten network.
We publish a video of the behavior of the phase in which a final dough * for bread with einkorn wheat is worked with a “fork” type mixer, contrasting it with a final dough made with other wheat (Timilia).
The difference in the behavior of the two different doughs is substantial.

Both doughs were made with the same method:

Einkorn wheat pre-dough: einkorn wheat flour, sourdough in liquid form of einkorn wheat (same as the dough), very limited quantities of brewer’s yeast as a starter, water.

Final dough of einkorn wheat: pre-dough, einkorn wheat flour, sourdough in liquid form of einkorn wheat (same as the dough), brewer’s yeast in very limited quantities as a starter, extra virgin olive oil, malt, salt, water.

Timilia wheat pre-dough: Timilia wheat flour, sourdough in liquid form of einkorn wheat (the same as the previous dough), very limited quantities of brewer’s yeast as a starter, water.

Final dough of Timilia wheat: pre-dough, Timilia wheat flour, sourdough in liquid form of monococcus wheat (the same as the previous dough), brewer’s yeast in very limited quantities as a starter, extra virgin olive oil, malt, salt, water.

NO additives or improvers were used.
Both flours were of the semi-wholemeal type (passing 600 microns sieve ).

The videos show how the Timilia wheat mixture is more homogeneous and “formable” and less “sticky” than the other. The difference is due to the different gluten: the more “performing” one generated by Timilia wheat. From the two videos it is possible to see the traces that the einkorn wheat mixture leaves in the mixer (further documented by photo “A”) absent in the case of the Timilia wheat.

Einkorn flour will never give easy, homogeneous elastic doughs unless the einkorn has been “domesticated”, for example with nitrogen fertilizers.

Video about Einkorn: https://youtu.be/Wugt9OrbMzQ

Video about “Timilia” : https://youtu.be/LYcnmdNtuxU

Photo “A”

Einkorn: christmas spells

by luciano

(for a finally normal 2021!)
A test for the realization of a very particular product: the carasau bread (puff bread) of pure einkorn wheat. A not easy realization considering the rheological characteristics of the einkorn wheat: little gluten and also weak. The dough has very little elasticity and cannot be manipulated for long because the gluten network breaks down. Method chosen: this test was carried out using the method (increasing the quantity of the pre-ferment) of the pre-ferment followed by the final dough already used for the bread.
https://glutenlight.eu/2019/09/27/pane-di-grano-monococco-piccolo-farro-100/.
Furthermore the method was adapted for a home preparation, so without the use – for example – of a a retarder prover. Times and temperatures have been defined for a semi-wholemeal einkorn flour (a flour through a 600 micron sieve), stone-ground flour, produced by “I grani di Atlantide” di Lorenzo Moi” 2019 harvest.
The “W” index of this flour is modest, placing itself below the value of 50. This clarification is necessary, because especially times and temperatures vary according to the flour (type and harvest) and its degree of refining (quantity of bran present). The method is for expert people”.

Ingredients
Idratation 55% 900 =545gr. (500gr. wtater + LiCoLi whater 45gr. )