Explain sorption isotherms along with a diagram. What do you understand by mutarotation and inversion of sugar?

Sorption isotherms are graphical representations that describe the relationship between the moisture content of a food product and the water activity (aw) at a constant temperature. These isotherms are fundamental in food chemistry and are vital in understanding water mobility, food preservation, texture, and stability during storage.

Sorption isotherms are categorized into three types: adsorption isotherms, desorption isotherms, and hysteresis curves. Adsorption refers to the process where dry food absorbs moisture from the surrounding environment, while desorption refers to the release of moisture from moist food. Hysteresis is the difference between adsorption and desorption curves, often due to structural changes or binding forces within the food matrix.

A typical sorption isotherm has three main regions:

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