cooking tech

Water

The smallest food molecule (H₂O), consisting of two hydrogen atoms covalently bonded to one oxygen atom.

Molecular structure of water

A polar molecule with an uneven charge distribution, leading to hydrogen bonding.

Properties of water

Strong covalent bonds but weak hydrogen bonds that are continually forming and breaking.

Water phases

Exists in three phases: solid, liquid, gas, influenced by temperature.

Ice

Solid state of water occurring below 0°C, with molecules arranged in a crystalline lattice.

Liquid water

State of water between 0°C and 100°C, where molecules move freely.

Steam

Gaseous state of water occurring above 100°C, where molecules are free from hydrogen bonds.

Heat conduction in cooking

Water absorbs and transfers heat slowly, making it ideal for boiling, steaming, and blanching.

Dissolution role of water

Water acts as a solvent for polar molecules, such as sugar and salt.

Water's effect on texture and flavor

Affects juiciness and viscosity during cooking processes like starch gelatinization.

Fats

Composed of triglycerides, which consist of a glycerol backbone bonded to three fatty acids.

Saturated fats

Fatty acids with no double bonds between carbon atoms, resulting in straight, tightly packed chains.

Unsaturated fats

Fatty acids with one or more double bonds, creating kinks in the chain.

Trans fats

Industrially hydrogenated fats that mimic saturated fats with straight chains.

Key chemical properties of fats

Hydrophobic due to nonpolar carbon-hydrogen bonds; some lipids act as emulsifiers.

Heat and fat melting point

Varies with fat type; e.g., butter softens around 30°C.

Smoke point of fats

Refined vegetable oils are more heat-resistant (~230°C) than animal fats (~190°C).

Roles of fats in cooking

Act as a carrier for fat-soluble vitamins and enhance flavor through browning reactions.

Proteins

Chains of amino acids linked by peptide bonds, forming various structures.

Chemical behavior of proteins

Sensitive to denaturation through heat, acidity, or mechanical action.

Denatured proteins

Lose their natural shape and coagulate, affecting food texture.

Roles of proteins in cooking

Essential for structure, texture, gelling, and flavor development.

Carbohydrates

Composed of carbon, hydrogen, and oxygen, with various types including sugars and starches.

Monosaccharides

Single sugar molecules such as glucose and fructose.

Disaccharides

Two linked sugar molecules like sucrose and lactose.

Polysaccharides

Long chains of sugars, including starch and cellulose.

Sugars dissolve in water

Due to multiple hydroxyl (-OH) groups.

Caramelization process

Occurs at temperatures above ~160°C, transforming sugars into rich flavors.

Maillard reaction

Occurs between sugars and amino acids at 140–165°C, creating savory flavors.

Starches in cooking

Gelatinization when heated with water, thickening sauces and forming gels.

Hydrophilic nature of sugars

Sugars are highly soluble due to their many oxygen-hydrogen bonds.

Heating sugars and their reactions

Includes caramelization and Maillard reactions.

Polysaccharides as gelling agents

Starch, pectin, and plant gums thicken sauces and desserts.

Flavor role of carbohydrates

Provide sweetness, complex flavor profiles, and moisture retention.

Flavor perception

Involves taste, smell, touch, sight, sound, and chemesthesis.

Types of flavor

Includes the five basic tastes: sweet, bitter, umami, sour, and salt.

Taste and smell interaction

Smell contributes significantly to overall flavor experience.

Chemesthesis definition

Involves physical sensations caused by certain chemicals, like heat and cooling.

Detailed taste components

Include sweetness, sourness, saltiness, bitterness, and umami.

Aromas classification

Aromas are categorized into types like fruity, floral, herbal, and more.

Influence of genetics on flavor perception

Individual sensitivities affect how flavors are perceived.

Flavor generation through cooking

Process influenced by ingredient storage and cooking techniques.

Salt definition

Sodium chloride (NaCl), essential for body functions such as blood pressure regulation.

Types of salt sources

Include seawater, salt lakes, and rock formations.

How salt works in food

Dissociates into ions, affecting osmotic and diffusion processes.

Effects of salt on food texture

Adds crunch and tenderizes meat.

Role of acid in food

Acids release hydrogen ions, lowering pH and influencing food structures.

Types of acids in cooking

Include vinegar, citrus, fermented foods, and more.

How acids work

Affect protein structure and enzyme activity, altering food textures.

Effects of acid on food

Influences texture, color, preservation, and flavor enhancement.

Heat definition in cooking

Transfer of energy from a hotter system to a cooler one.

Forms of energy systems

Includes potential energy and kinetic energy.

Heat transfer mechanisms

Include conduction, convection, and radiation.

Cooking through conduction

Direct transfer of energy between solids.

Cooking through convection

Heat transfer in fluids, enhanced by movement.

Cooking through radiation

Heat transfer through electromagnetic waves without contact.

Effect of heat on foods

Affects water phase changes, carbohydrate reactions, and protein structures.

Cooking with hot water

Involves techniques like boiling, sautéing, and sous-vide.

Cooking with hot surfaces

Direct conduction cooking methods like sautéing and stir-frying.

Cooking with hot air

Involves baking and roasting with convection heat transfer.

Cooking with hot oil

Includes deep-frying with convection and stages of cooking.

Cooking with radiation

Includes grilling and broiling as effective cooking methods.

Pot roasting definition

Combination of conduction, convection, and radiation in slow cooking.