What is sorption isotherm of food?
The food sorption isotherm describes the thermodynamic relationship between water activity and the equilibrium of the moisture content of a food product at constant temperature and pressure.
Why sorption isotherm is important for food manufacturing?
The moisture sorption isotherm is a powerful tool for predicting and extending the shelf life of a product. It allows you to: Find critical water activity values where changes like caking, clumping, and loss of texture occur. Predict how the product will respond to ingredient and formulation changes.
What are isotherms and their importance?
isotherm in American English 1. a line on a map connecting points on the earth’s surface having the same mean temperature or the same temperature at a given time. 2. a line representing changes of volume or pressure at constant temperature.
How is water sorption isotherm related to the moisture content in a food?
Manometers determine water activity by directly measuring the vapor pressure above a food. The moisture sorption isotherm of a food is obtained from the equilibrium moisture contents determined at several water activity levels at constant temperature.
What are the types of isotherms?
Different types of physisorption isotherms as observed for different adsorbents. Type I: microporous; Type II: non-porous or macroporous; Type III: non-porous or macroporous with weak interaction; Type IV: mesoporous; Type V: mesoporous with weak interaction; Type VI: layer-by-layer adsorption.
What is an isotherm and what is the purpose of isotherms?
Isotherms are lines of constant or equal temperature. They are often used on weather maps by meteorologists to give a large scale view of temperatures across the U.S. If you have ever looked at a weather map in a newspaper, the isotherms are used to divide the color-filled temperatures.