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.

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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 basic science behind cooking? ›

The role of heat, acid, and enzymes in cooking

Heat and enzymes: Heat breaks down enzymes such as proteins. This is called denaturing, and it's why egg whites turn solid and white when you cook them. Without this reaction, many foods wouldn't have their distinctive "bite" when you eat them.

What are the scientific principles of cooking? ›

For the most time it is important to know how your food will react in certain situations and cooking conditions. The six basic principles will surely help you with that! They are as follows: Caramelization, Coagulation, Denaturation, Emulsification, Gelatinization and the Maillard reaction.

What is scientific about cooking? ›

Science is an important and constant element in the culinary process. Foods are scaled proportionately, and combined in a certain order, to achieve desired outcomes. Chemical reactions occur in cooking through manipulation or emulsification. The control of heat and cold maximizes food quality and safety.

Is gastronomy a science or an art? ›

Gastronomy, often described as the art and science of good eating, is a culinary journey that goes beyond mere sustenance. It's a world where food becomes an experience, and dining transcends into an art form.

What is the first principle of cooking? ›

It's a way of thinking, an ability to see that everything you do from the moment you step into the kitchen to the last dish you dry is part of a single, simple process. You realize that the “perfect” way to prepare any dish is whatever happens to work with you and your meal.

What is the science of cooking called? ›

molecular gastronomy, the scientific discipline concerned with the physical and chemical transformations that occur during cooking. The name is sometimes mistakenly given to the application of scientific knowledge to the creation of new dishes and culinary techniques.

What is the chemistry behind cooking? ›

Maillard Reaction: The Browning Magic

The Maillard reaction occurs between amino acids (proteins) and reducing sugars in the presence of heat, resulting in the formation of hundreds of flavor compounds that contribute to the rich taste and aroma of foods such as roasted coffee, grilled meat, and freshly baked bread.

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 is culinary principles? ›

Culinary Principles includes all of the content required to master the essential culinary skills in the following modules: Introduction to Culinary Careers. Kitchen Equipment and Safety Practices. Food Safety Essentials.

What are the physics concepts of cooking? ›

The basic physics principles behind cooking can be phase transformations, Thermal conductivity, specific heat and thermal diffusivity. The phase can be considered as a physically separable portion of matter or a region of matter where unique properties exist.

What science says about food? ›

Research consistently shows that when you eat mostly plant foods, markers of health improve. Benefits include lower blood pressure, triglyceride levels, glucose and waist circumference, which can translate to a lower risk of a number of different diseases, including heart disease and diabetes.

What is the science behind food? ›

Food Science is a multi-disciplinary field involving chemistry, biochemistry, nutrition, microbiology and engineering to give one the scientific knowledge to solve real problems associated with the many facets of the food system.

Is cooking a skill or an art? ›

Cooking can be seen as both an art and a skill, depending on how it's approached and practiced. As an art, cooking involves creativity, intuition, and expression.

Is baking an exact science? ›

The process of baking also involves studying the structure and behaviour of the physical… in the form of ingredients, by watching (or choosing), measuring, doing experiments with these ingredients, and then developing theories, aka methods and recipes. This is how every baked good originates!

What is the science behind food science? ›

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.

How does physics apply to 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 is the chemistry behind cooking meat? ›

Once the surface is dry, the heat causes the proteins and sugars on the outside of the meat to undergo a reaction called the Maillard Reaction. This reaction produces a complex mixture of molecules that make food taste more savory or “meaty” and adds depth to scents and flavors.

What is the science of cooking course? ›

Through the professional certificate in the Science of Cooking, you will not only examine scientific concepts that are essential for everyday cooking, but you will also learn how biology, chemistry, and physics change food flavor, texture, and preservation — making our food more nutritious, delicious, and safe to eat.

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