Starter Cultures

Fermenting sausage is an old-school craft that goes back thousands of years. Before refrigeration existed, people needed a way to make meat last—and fermentation became one of the best answers. From the very beginning, this process has depended on naturally occurring microbes, especially lactic acid bacteria and Micrococcaceae (a group that includes helpful staph strains), which live in the meat and in the general environment where sausages are made. Back before commercial starter cultures existed, fermentation was basically a “wild” process. It relied on whatever bacteria happened to be present, plus the way the meat was handled—things like pre-salting, grinding, stuffing, and the temperature/humidity during aging. Sometimes that worked beautifully. Sometimes it didn’t.

When it didn’t, the risks were real:

The sausage might not ferment enough, leaving the pH too high. Spoilage bacteria could take off, and in the worst cases, pathogens could grow. Sometimes you’d get the “wrong” lactic acid bacteria—like strains that produce gas, which can cause defects in texture and appearance.

That’s why starter cultures became a game-changer. These microorganisms—once wild and unpredictable—have been refined into modern cultures that help deliver safer products, more consistent results, and better flavor.

What is proteolysis, and why does it matter?

When you see “proteolytic” listed for a starter culture strain, it means that the bacteria, yeast, or mold can produce natural enzymes that slowly break down meat proteins into smaller pieces. This is important because it: Helps create the classic cured/fermented flavor we associate with salami and dry-cured meats and builds the foundation for deeper flavor development as the product ages. Think of it as “flavor unlocking” from the protein side of the meat.

What is lipolysis, and why does it matter?

When you see “lipolytic,” it means a strain can produce enzymes that slowly break down fats into smaller fatty acids. This matters because it: Contributes to the signature aroma and flavor of fermented and aged products and improves mouthfeel, often giving a richer, creamier eating experience over time. It can help the fat feel softer and more integrated in the finished slice - think of it as flavor + texture development from the fat side of the product.

What is nitrate reductase activity?

Some starter culture strains are described as having nitrate reductase activity. That simply means they produce an enzyme (words ending in “-ase” are usually enzymes) that helps convert nitrate → nitrite during curing. Why that’s important: Nitrite is what provides the classic cured color, cured flavor, and a big part of the food-safety protection associated with cured meats. 

If you use potassium nitrate (saltpeter) or Cure #2 (which contains nitrate), this enzyme activity helps the curing process work as intended over time. This is a normal, desirable, and safe part of traditional dry-curing and fermented meat production when used correctly.