Many preservatives kill yeast. Preservatives E211 (Sodium benzoate) and E202 (Potassium sorbate) are used abundantly in supermarket concentrates. These two are particularly good at killing yeast.

What preservatives prevent yeast?

Chemical Preservation

Sorbic acid and sorbates are most effective against yeasts and molds. Their action against bacteria is highly selective (Sofos and Busta, 1983). Potassium sorbate is often used together with sodium benzoate.

What additives kill yeast?

Preservatives. Potassium Metabisulfite or Campden Tablets are used to kill off the wild yeast and bacteria.