Food Chemistry

Food chemistry is the study of the chemical composition of food and the reactions that food undergoes during growth, processing, cooking, and storage. Foods are built from the major classes of biological molecules, including carbohydrates, proteins, and fats, along with water, vitamins, and minerals. Understanding how these substances behave explains the nutritional value of food, the changes that occur when it is prepared, and the processes that cause it to spoil.

Among the most important chemical changes in food are oxidation and reduction reactions, in which electrons are transferred between substances. Oxidation, the loss of electrons, is responsible for many familiar changes, such as the browning of cut fruit exposed to air and the development of off-flavours when fats turn rancid. Tracking these reactions involves concepts such as oxidation states, the bookkeeping numbers assigned to atoms to follow how electrons shift during a reaction, which help chemists balance equations and classify the types of reaction taking place.

Other chemical principles also underlie food science. Electronegativity, the tendency of an atom to attract electrons, helps explain how molecules form and react, while the distinction between ionic and other compounds shapes how substances dissolve and interact. Photosynthesis, the process by which plants build sugars from carbon dioxide and water using light, is the ultimate chemical origin of most food. By applying these ideas, food chemistry guides efforts to preserve food, improve its quality, and understand how cooking transforms raw ingredients into the things people eat.

Frequently asked questions

What does food chemistry study?

It studies the chemical makeup of food and the reactions food undergoes during growing, processing, cooking, and storage, which determine nutrition, flavour, and spoilage.

Why does cut fruit turn brown?

Browning is an oxidation reaction. When the exposed surface reacts with oxygen in the air, electrons are lost and new compounds form that darken the fruit.

What are oxidation states?

Oxidation states are numbers assigned to atoms to track how electrons shift during a reaction. They help chemists identify and balance oxidation-reduction reactions.