The concept of protein denaturation might be foreign to anyone who doesn’t work in a lab. But for the millions of people who make their living cooking, baking, or processing foods — and the millions more who cook at home — protein denaturation is something that actually plays a role in day-to-day activities. In the kitchen, the process of protein denaturation can contribute to a loss of stability in proteins during the cooking process and this can fundamentally change the qualities of certain ingredients.
One example of this is seen in gluten, which includes certain types of proteins found in wheat, rye, and related grains. When gluten is heated past a certain point, it becomes denatured, causing it to lose its firmness and structure. This can result in an imperfect loaf of bread or a cake that collapses in on itself.
Denaturation of Gluten
Gluten-sensitive diners should take note that overheating gluten and denaturing it does not “destroy” the gluten or remove it from your dish. Denaturing gluten merely breaks down the protein structure. Bread would need to be heated far beyond any normal baking temperatures to remove or destroy the gluten.
While too much gluten denaturation can result in a ruined batch of muffins, that doesn’t mean denaturation is always unwanted in the kitchen. Protein denaturation is also the mechanism by which your meat becomes fall-off-the-bone tender after hours in the slow cooker. In this case, the application of heat at a certain rate denatures the proteins in the meat’s connective tissues, causing it to effectively melt and fall apart for that juicy, tender texture that people love.
Protein Denaturation and Food
When protein denaturation is targeted effectively by applying certain processes to certain ingredients, it unlocks an extensive toolkit for culinary applications. This has been especially evident in the emergent field of plant-based proteins. By denaturing plant proteins in certain ways, plant-based ingredients can be coaxed into taking on textures or consistencies similar to meat products. High-end testing platforms can measure protein denaturation in addition to unfolding, particle size, aggregation, and chemical denaturation.
Here are some of the ways protein denaturation can be targeted for culinary effect, either in your own cooking or in a lab setting during the development of new protein products for the consumer market:
- Increased solubility. A food product’s ability to either absorb or withstand oils and liquids has major implications for its culinary uses.
- Improved emulsification. New plant-based meat substitutes are often a careful combination of several different plant-based ingredients, so it is important that each protein can be effectively broken up for mixing with the others.
- Change in texture. Just as the texture of a steak is changed with the correct application of heat, the denaturing of plant proteins plays a vital role in what the texture, appearance, and mouthfeel of the product will be when it reaches the consumer’s plate.
- More functional products overall. When you can understand and manipulate the different states of denaturation in your plant-based protein ingredients, it unlocks possibilities for experimentation.
With the right controls in place and an informed understanding of protein denaturation, plant-based proteins are becoming ever more viable for a multitude of uses in consumer and commercial markets.
Sources:
https://www.bakingbusiness.com/articles/54165-pro-tip-cold-denaturation-reveals-novel-plant-based-protein-functionality
https://www.coeliacsanctuary.co.uk/blog/does-heat-destroy-gluten
