酵母菌和霉菌

Yeast and mold are microorganisms that can be found in breads and biscuits. Yeast is commonly used in bread baking to help the dough rise, while mold can grow on bread and other baked goods if they are not stored properly or if they are past their shelf life.

Yeast is a type of fungus that ferments the sugars in dough, producing carbon dioxide gas that causes the dough to rise. Yeast is typically added to bread dough along with flour, water, salt, and other ingredients. There are two main types of yeast used in bread baking: active dry yeast and instant yeast.

Mold is a type of fungus that can grow on bread and other baked goods if they are stored in warm, moist environments. Mold spores can be present in the air, and they can settle on bread and begin to grow if the conditions are right. Mold can cause bread to become discolored and develop a musty odor, and it can also produce mycotoxins that can be harmful if ingested.