The Science Behind Sourdough

Fermentation is a chemical reaction that happens in sourdough dough — bacteria break down sugars and create acid and gas, which is the same science that makes yogurt and pickles.

Gluten is a stretchy protein in flour that gives bread its structure — when you mix and knead dough, the gluten forms long chains, like Anna's blonde hair braided together.

Wild yeast floats in the air all around us — it lands on flour and water and starts growing, which is why sourdough starters can begin with just those two ingredients.

The crust of sourdough bread forms through a process called the Maillard reaction — heat causes proteins and sugars to turn brown and create that delicious crispy outside.

Sourdough dough rises because of carbon dioxide gas — the bacteria and yeast create this same gas that makes bubbles in soda pop and balloons float.

Acetic acid is what makes sourdough taste sour — it's the same acid found in vinegar, and it develops over time as bacteria work their magic.

Temperature affects how fast sourdough ferments — warm kitchens make it rise faster, while cold ones slow it down, just like how Anna moves faster when she's excited.

Salt in sourdough dough controls the bacteria growth — too much salt slows the bacteria, and too little lets them grow too fast, so bakers must get it just right.

Enzymes in the dough break down starches into sugars — these enzymes are like tiny workers that prepare food for the bacteria to eat.

Sourdough bread stays fresh longer than regular bread — the acid from fermentation keeps mold from growing, so your loaf lasts several days on the counter.