Science of Cooking: Ask the Inquisitive Cooks! (2024)

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" How does cornstarch work ? "

Dear Anne and Sue,

OK, so what's the deal with cornstarch? Why, when it's supposed to thicken, does it sometimes seem to go the opposite way and make stuff runnier? How does cornstarch work?

Thank you,
Dallas R.
Calgary, AB

Still have more questions? You'll find more answers in our archived monthly feature articles by the Inquisitive Cooks.

( Meet the Inquisitive Cooks )

Hi Dallas,

As you've discovered, starches are sometimes noted for their idiosyncrasies! Cornstarch is one of the most commonly used thickeners, but it has some unique traits. So thanks for the good question!

Cornstarch must be cooked to 95°C (203°F) before thickening begins. At that point, it usually thickens fairly quickly and the sauce turns from opaque to transparent. When cornstarch thins after it's thickened, it's usually due to continued stirring. Once the thickening network forms, any agitation interferes with the setting process. The sauce thins when the starch network that sets and traps the liquid is broken. Liquid is released and thins the sauce.

Science of Cooking: Ask the Inquisitive Cooks! (23)
While cornstarch thickens as it heats, it also sets as it cools, so it's particularly useful as a gelling agent for desserts that must hold their shape such as lemon pie filling. Also, as cornstarch becomes clear when thick, while flour remains somewhat opaque, the color of fruit sauces is deeper and more appealing when those sauces are thickened with cornstarch. Cornstarch also sometimes appears to thin as it stands. This is due to a process called syneresis (commonly referred to as weeping). What you'll see is a fluid seeping from the gel. This problem is more evident if the gel (often a pudding or pie filling) also contains eggs or has a high sugar concentration. People often wonder what the difference is between cornstarch and flour. Both are cereal starches, but cornstarch is pure starch while flour contains gluten. The gluten reduces the thickening power of flour. One tablespoon of cornstarch thickens one cup (250 mL) of liquid to a medium consistency. It takes two tablespoons of flour—twice as much—to thicken the same amount of liquid.

Your query really brings up the point that there's a lot to learn about the thickeners that cooks use every day. Wishing you successful sauces!

Anne & Sue

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Science of Cooking: Ask the Inquisitive Cooks! (2024)

FAQs

What is the science behind cooking food? ›

One of the most important chemical reactions that occur during cooking is the Maillard reaction. This is what happens when you heat food and it browns on the outside. In the Maillard reaction, the heat allows amino acids to react with reducing sugars.

What are the scientific principles of cooking? ›

Let's take a closer look at a few reactions between heat and food and discover the scientific principles behind some of our favorite dishes.
  • Maillard Reaction: The Browning Magic. ...
  • Protein Denaturation: Changing Structures. ...
  • Gelatinization: The Science of Starch. ...
  • Caramelization: Sugars at Work. ...
  • Cooking Oil and Heat Transfer.
Oct 6, 2023

How does cooking affect connective tissues? ›

The relevance of connective tissue to cooking is that collagen dissolves in hot water, so less tender cuts where connective tissue is well developed benefit from cooking with moisture. In contrast, fibers of elastin are not tenderized by moist heat, and therefore remain tough.

Is culinary chemistry a real thing? ›

Any cooking you do involves chemistry. The use of heat, cold, and cutting changes the composition of foods. Even simply slicing an apple sets off chemical reactions that change the color of the apple's flesh. If you heat up sugar to turn it into syrup, you're using a chemical reaction.

What is the science behind food? ›

What is Food Science? Food science draws from many disciplines, including biology, chemical engineering, and biochemistry to better understand food processes and improve food products for the general public. As the stewards of the field, food scientists study the physical, microbial, and chemical makeup of food.

What is the science of cooking called? ›

molecular gastronomy, the scientific discipline concerned with the physical and chemical transformations that occur during cooking.

Is cooking an exact science? ›

All cooking is scientific in nature, but with baking there is a very specific scientific interplay between ingredients.

What are the physics of cooking? ›

The product of time, temperature and nature of medium used for cooking can decide the quality of food. Understanding the concept of thermal conductivity, specific heat and thermal diffusivity can lead to optimized time of cooking.

What are the three principles of cooking? ›

  • Dry-heat cooking- use air or fat.
  • Moist –Heat Cooking – use water or steam.
  • Combination Cooking – combine dry and moist heat together.

What cuts of meat are high in collagen? ›

Meat on bones, such as ribs, oxtail, wings, drumsticks and shanks, contains collagen-rich connective tissues and cartilage. These cuts require slow cooking methods like braising, stewing, or roasting to break down the collagen and create tender, flavorful meat.

At what temperature does fat melt? ›

Fats are crucial to meat texture. Waxy when cold, fats start to melt around 130°F to 140°F, lubricating muscle fibers just as they are getting tougher and drier from the heat. Fat does not evaporate like water when you are cooking.

What temperature breaks down collagen? ›

To keep track of a low and slow cook, you really need a thermometer, and you need a thermometer that you can leave in your food. Collagen dissolution really gets going starting at about 170°F (79°C). But as it takes a long time for those helixes of protein to unwind, it's better to get the temperature a little higher.

What is the scientific approach to cooking? ›

Molecular gastronomy is the scientific approach of cuisine from primarily the perspective of chemistry.

What is the science of eating called? ›

Food science is the basic science and applied science of food; its scope starts at overlap with agricultural science and nutritional science and leads through the scientific aspects of food safety and food processing, informing the development of food technology.

What chef uses science to cook? ›

Heston Marc Blumenthal OBE HonFRSC (/ˈbluːməntɔːl/; born 27 May 1966) is an English celebrity chef, TV personality and food writer. Blumenthal is regarded as a pioneer of multi-sensory cooking, food pairing and flavour encapsulation.

What is the chemistry behind food science? ›

Food chemistry is one of the fields involved in the multi-disciplinary field of food science. It is the study of food components, such as proteins, carbohydrates, fats, and water. In addition, food chemistry assesses the reactions these components go through during food processing and preservation.

What is the cooking show about the science of cooking? ›

Chef Secrets: The Science of Cooking.

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