How food chemistry works in your kitchen every day
Texas A&M expert explains the science behind cooking and how to use it for better flavor and texture
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That perfectly seared steak or fresh-baked bread is more than a kitchen win — it’s science at work. Chemistry happens in your kitchen every day and understanding it can help you cook better.
Rebecca Creasy Buckley, Ph.D., instructional associate professor, teaches introductory food science courses in the Department of Food Science and Technology in the Texas A&M College of Agriculture and Life Sciences. Buckley helps students understand how simple chemical reactions turn ingredients into the foods we love.
Here’s what she had to say.
Why does food chemistry matter in your kitchen?
When you understand what’s happening in your kitchen, you’ll feel more confident. Cooking may feel intuitive, but it’s also driven by chemistry. Once you start noticing it, you realize your kitchen really is a laboratory.
You’ll be able to troubleshoot recipes, adjust techniques and make informed choices at the grocery store.
Food science isn’t just for the lab. It’s something we experience every day.
What’s the Maillard reaction and why does it matter?
The Maillard reaction, simply put, is when food such as steak or bread turns brown. It happens when proteins, which are made up of amino acids, interact with reducing sugars under heat.
This reaction produces brown pigments called melanoidins, which also create the aroma compounds we associate with some of our favorite foods.
It’s why the outside of a steak turns brown and flavorful and why bread crust has such a rich smell. It’s not just about color — it’s what builds flavor. You also see it in roasted grains, like in beer or coffee.
Is the Maillard reaction the only browning reaction we see in the kitchen?
Not at all. There’s also enzymatic browning, which is different because it involves enzymes. When you cut into an apple, you break open its cells. Enzymes called polyphenol oxidases react with oxygen, causing the fruit to brown.
That’s why people sprinkle lemon juice on sliced apples. It lowers the pH and slows the enzyme reaction that causes browning. A brown apple is still safe to eat. But we often associate brown with “bad,” even when it’s harmless.
What makes bread rise?
Bread is full of fascinating reactions. Yeast is a living organism that grows and produces carbon dioxide gas when mixed with warm water and flour. Gluten proteins in the flour form a network that traps the gas. This trapped gas is what makes bread rise during proofing and baking. Without gluten, it’s harder to trap the gas, which is why gluten-free breads tend to be denser. It’s a great example of how ingredient functionality affects texture.
Want to learn more about cooking?
Texas A&M AgriLife Extension Service provides resources that teach you how to create affordable, nutritious meals.
Are there browning reactions that might not look appealing but improve flavor?
Caramelization is a great example. It may not always look appetizing, but it can drastically improve taste.
When sugars are exposed to high heat, they break down and form new flavor compounds. Think of caramelized onions — they darken significantly, but that browning creates sweetness and depth.
Coffee roasting has a similar effect. Lighter roasts tend to be more acidic and fruitier. As roasting continues, reactions, including the Maillard reaction, transform those flavors into more toasted, nutty or chocolate-like notes. Those changes are all driven by chemistry.
