
#15: How Microbes Contribute Body, Acidity, & Fruity Flavors To Your Cup of Coffee
Making Coffee with Lucia Solis
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The Importance of Fermentation
fermentation is about more than removing the mucilage, it's this metabolic activity. The yeast objective is to create adenosine triphosphate (ATP), which is the energy molecule that is present in all living tissues. Sucrose and pectin are too large to enter the yeast cell; so the yeast releases enzymes to break the sucrose bonds. Acetic acid can be perceived as pleasantly fruity but at high levels it tips towards rotting fruit. This also explains why a coffee that has an acetic acid defect or rot is usually described as boozy.
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