Most consumers have an idea what they want their pizza slice to look like, according to the Institute of Food Technologists (IFT): golden cheese with that dark toasted-cheese colour scattered in distinct blistery patches across the surface with a bit of oil glistening in the valleys. A new study in the Journal of Food Science, published by the IFT, evaluated the pizza baking performance of different cheeses (mozzarella, cheddar, colby, Edam, Emmental, Gruyere, and provolone) in conjunction with a new quantifiable evaluation technique to see how their composition and functional differences affected browning and blistering.
The study found that the elasticity, free oil, moisture, water activity and transition temperature all influence the colour uniformity of cheeses. Blisters were not formed for cheddar, colby, and Edam cheeses because of their small elasticity. A sufficient amount of free oil prevents moisture evaporation, and thus less intensive browning on Gruyere and provolone, and hardly at all with Emmental. Therefore, these cheeses can be combined with the easily blistering mozzarella to create a gourmet pizza with a less burnt appearance.
This study is unique, according to the IFT, because the researchers did not rely on human sensory assessment. Instead, they developed a machine vision technique coupling careful imaging with quantified image analysis to help quantify a description that can be used by pizza manufacturers to make an appealing product for consumers.
