Gluten-free Flours

Also known as gluten-free blends

What are Gluten-free Flours?

Gluten-free flours or blends are dry mixes that can replace or substitute gluten in bakery products such as bread, pizza, cookies, pasta or cakes. They rely on a proper balance of components that resemble as much as possible the functionality and properties of wheat gluten-forming proteins.

Current consumer awareness of gluten allergenicity and other related disorders (celiacs) have created the need for the development of good tasting and healthy gluten-free products.

Challenges with formulating gluten-free flours

Several factors still limit the development of gluten-free flours. A few are:

Ensuring good gas retention by creating a hydrated and cohesive network to trap gases produced by yeast fermentation, chemical leaveners and oven baking.
Formulating a wheatless dough of optimum handling properties like elasticity, extensibility, and stickiness. Also, the dough must expand and machine properly.
Generating an oil-in-water emulsion or batter of optimum viscosity and bench tolerance.
Producing baked goods with optimum color and volume, chewy texture and an airy/porous mouthfeel.

These goals can be achieved by using alternative starch- and protein-rich sources and often include hydrocolloids. The choice of ingredients and their levels vary with the end product. For example, a gluten-free flour intended for gluten-free bread might differ markedly from a gluten-free blend formulated for cakes or cookies.

Application

Components of gluten-free flours^1,2

Starch sources
- Cereals: rice, corn, oats (Can be safe as long as the source is free of cross-contamination from wheat)
- Seeds: chia, quinoa
- Ancient (heritage) grains: millet, sorghum, teff (Can be safe as long as the source is free of cross-contamination from wheat)
- Tubers and roots: potato, tapioca

Protein sources
- Dried egg whites
- Dried whole eggs
- Legumes or pulses: beans, soybeans, lentils, dry peas, chickpeas, lupins
- Enzyme-active soy flour
- Pseudocereals: quinoa, amaranth, buckwheat
- Nonfat dry milk or milk solids (Whey/soy flour blends can be used as substitutes)
- Dried fruits, tree nuts (e.g. almond flour)
- Sodium or calcium caseinate
- Milk protein isolates

Hydrocolloids (gums)
- Xanthan gum
- Gellan gum
- Carboxymethylcellulose (CMC)
- Guar gum
- Locust bean
- Gum Arabic (Acacia gum)
- Gelatin
- Pectin
- Alginate
- Psyllium husk
- Agar
- Carrageenan

Modified starches
- Pregelatinized or instant
- Cross-linked
- Oxidized
- Stabilized starch

Dough conditioners
- Starch-complexing materials (emulsifiers)
- Amylase
- Transglutaminase
- Sugar oxidase

Leavening systems
- Active or instant dry yeast
- Baking powder

Functionality of main gluten-free flour components ^1,2

Ingredient	Function
Starch sources	Main filler of dough matrix (protein-starch network) Set crumb during baking through gelatinization Provide food for yeast Increase viscosity of batters Improve gas bubble stability during batter processing (greater bench tolerance of cake batters)
Protein sources	Provide structure to doughs and batters through coagulation during baking Contribute to water absorption Enhance crust color through Maillard reactions Provide elasticity to dough by building structure and linking polymers within dough matrix Improve gas retention capacity of dough Enhance emulsifying, foaming, coagulation and gelation properties of batters and doughs
Hydrocolloids / modified starches	Provide water binding mechanism in gluten-free dough matrix, thus enhancing cohesiveness and gas retention. Thickening agents via increasing batter viscosity at room temperature (cold functionality) Greater dough water absorption at room temperature Formation of gels that confer visco-elastic behavior to dough Improve moisture retention of baked goods Improve freeze-thaw stability Improve bench tolerance of batters
Enzymes, emulsifiers	Extend shelf-life of baked products by slowing down staling Strengthen dough matrix and soften crumb of finished product Improve texture of baked goods Improve gas retention capacity of dough matrix

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Many gluten-free flours or blends are found at both retail and wholesale levels. They are available as complete dry formulas or can be readily made into dough that may need incorporation of unique minor and micro ingredients.

When considering a gluten-free blend, it is important to confirm that the facility where it is produced has a gluten-free certification and that the dry mixes are tested before receipt, with a corresponding certificate of analysis confirming the results.

Leavening systems

Gluten-free flours intended for the production of gluten-free bread can incorporate dry yeast forms (e.g. ADY, IDY) along with specially formulated baking powders.

Given the limited gas retention capacity of the dough-like mixture, quick processing must be carried out to prevent excessive gas loss. Makeup stage is usually not possible given the inferior rheology, consistency and handling properties of the gluten-free dough.

Chemical leaveners in a gluten-free blend may include a slow-acting or heat-triggered leavening acid, or a coated baking powder. These forms allow a better control and delayed gas release that help the product attain and keep optimum volume throughout processing.

References

Arendt, E.K. “Gluten-free breads.” Gluten-free Cereal Products and Beverages, Academic Press, Elsevier Inc., 2008, pp. 289–310.
Casper, J.L., and Atwell, W.A. “Gluten-Free Ingredients.” Gluten-free Baked Goods, AACC International, Inc., 2014, pp. 23–47.

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