What are some of the changes that occur when food is dried?
What are some of the changes that occur when food is dried?
During drying, colour may change because of chemical or biochemical reactions. Enzymatic oxidation, Maillard reactions, caramelization, and ascorbic acid browning are some of the chemical reactions that can occur during drying and storage.
Does water evaporate when dry?
When a wet object dries, it is because the liquid water that is on the object evaporates to water vapor and diffuses out into the air. Drying consists of individual water molecules breaking free of their bonds to each other and to the object, and then flying out into the air.
What happens to heat when water is evaporated?
Evaporation happens when a liquid substance becomes a gas. When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor. Heat from the sun, or solar energy, powers the evaporation process.
What causes water to evaporate?
In the water cycle, evaporation occurs when sunlight warms the surface of the water. The heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas. Once evaporated, a molecule of water vapor spends about ten days in the air.
What are the effects of drying?
Drying not only reduces the moisture content of products but also alters other physical, chemical, and biological properties, such as antioxidant capacity, enzymatic activity, aroma, flavour and so on (Jiang et al., 2017).
How does drying affect the nutritional value of food?
Dehydrated foods have a higher calorie content by weight and can be high in sodium and sugars, depending on the food. In excess, these nutrients can cause weight gain and increase your risk of obesity, heart problems, and diabetes.
What is the difference between boiling and vaporization?
Boiling is a rapid and fast vaporization of a liquid when it is heated at its boiling point. Vaporization is a process of converting a substance from its liquid or solid form into a gaseous form.