Read the notes, then try the practice. It adapts as you go.When you're ready.
Session Length
~17 min
Adaptive Checks
15 questions
Transfer Probes
8
Food science is the interdisciplinary study of the physical, biological, and chemical properties of food and the principles underlying food processing, preservation, and safety. It draws on fields such as chemistry, biochemistry, microbiology, nutrition, and engineering to understand how food components interact and how those interactions affect quality, safety, shelf life, and sensory characteristics. From the molecular behavior of proteins during cooking to the microbial ecology of fermentation, food science provides the scientific foundation for everything we eat.
The discipline emerged as a formal field in the mid-twentieth century when industrialized food production demanded rigorous scientific methods to ensure consistency, safety, and nutritional adequacy at scale. Pioneers like Nicolas Appert, who developed thermal canning, and Louis Pasteur, whose work on microbial spoilage led to pasteurization, laid the groundwork for modern food science. Today the field encompasses food chemistry, food microbiology, food engineering, sensory science, and food safety, each contributing specialized knowledge to the broader goal of delivering safe, nutritious, and appealing food to consumers worldwide.
Modern food science faces pressing challenges including reducing food waste, developing sustainable protein alternatives, ensuring food security for a growing global population, and responding to consumer demand for minimally processed and transparent ingredient lists. Advances in areas such as high-pressure processing, encapsulation technology, precision fermentation, and predictive microbiology are transforming how food is manufactured and preserved. Understanding food science empowers professionals and consumers alike to make informed decisions about nutrition, safety, and the environmental impact of the food system.
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A complex set of non-enzymatic browning reactions between reducing sugars and amino acids that occurs when food is heated, producing hundreds of flavor and aroma compounds as well as brown pigments called melanoidins.
Example: The golden-brown crust on bread, the deep color of seared steak, and the rich flavor of roasted coffee all result from Maillard reactions occurring at temperatures above roughly 140 degrees Celsius.
A measure of the availability of water in a food for chemical reactions and microbial growth, expressed as the ratio of the vapor pressure of water in the food to the vapor pressure of pure water. Values range from 0 to 1.
Example: Dried jerky has a water activity of about 0.75-0.85, which inhibits most bacterial growth but still allows some mold growth, while fresh fruit typically has an aw above 0.95.
A systematic preventive approach to food safety that identifies physical, chemical, and biological hazards in production processes and designs critical control points to reduce or eliminate those hazards.
Example: In a pasteurized milk plant, the pasteurization step is a critical control point where milk must reach at least 72 degrees Celsius for 15 seconds to eliminate pathogens like Salmonella and Listeria.
The process of dispersing one immiscible liquid into another in the form of small droplets, stabilized by emulsifying agents that reduce interfacial tension and prevent phase separation.
Example: Mayonnaise is an oil-in-water emulsion where egg yolk lecithin acts as an emulsifier, keeping tiny oil droplets suspended in the aqueous vinegar-lemon juice phase.
A heat treatment process designed to destroy pathogenic microorganisms and reduce spoilage organisms in food without significantly altering its nutritional value or sensory qualities.
Example: High-temperature short-time (HTST) pasteurization heats milk to 72 degrees Celsius for 15 seconds, while ultra-high temperature (UHT) processing heats milk to 135-150 degrees Celsius for 2-5 seconds to achieve shelf-stable products.
The irreversible process in which starch granules absorb water and swell when heated in the presence of moisture, causing the granules to lose their crystalline structure and form a viscous gel.
Example: When making a roux-based sauce, the flour starch granules gelatinize as the mixture is heated, thickening the sauce. Different starches gelatinize at different temperatures: cornstarch at 62-72 degrees Celsius, wheat starch at 58-64 degrees Celsius.
A metabolic process in which microorganisms such as bacteria, yeast, or molds convert sugars and other substrates into acids, gases, or alcohol under anaerobic or partially anaerobic conditions, transforming food flavor, texture, and preservation.
Example: In yogurt production, Lactobacillus bulgaricus and Streptococcus thermophilus ferment lactose into lactic acid, lowering pH to around 4.5, which coagulates milk proteins and creates the characteristic tangy flavor.
The alteration of a protein's native three-dimensional structure by external factors such as heat, acid, mechanical agitation, or chemical agents, which changes its functional properties without breaking peptide bonds.
Example: When an egg is cooked, heat causes the albumin proteins to unfold and re-aggregate, transforming the egg white from a translucent liquid to an opaque solid.
More terms are available in the glossary.
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