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

Sorption isotherms describe the relationship between the water content of a food and the water activity (aw) at a constant temperature. These isotherms are crucial in food chemistry because they help understand how moisture interacts with food materials, influencing texture, stability, and shelf life. The isotherm curve is typically plotted with moisture content (on a dry basis) on the y-axis and water activity on the x-axis.

There are generally three types of sorption isotherms observed in food systems, with Type II being the most common. Type II isotherms have a sigmoid (S-shaped) curve. The initial part (Region I) represents monolayer moisture where ______ ____ ____ _________ _______ _________ _______ ___ _____.
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