E234 is a food additive approved by the European Union (EU) and used as an antifungal preservative in food products.
The common name for E234 is nisin.
E234 is a polypeptide antibiotic, made of chains of 34 amino acids. This chemical is a primary metabolite as it is produced by fermentation, during the growth of the bacterium Lactococcus lactis. E234 can be obtained naturally (e.g. from milk), and is also chemically synthesised.
Examples of food and drink products that sometimes include E234:
- tomato paste
- canned fruits
- processed cheese products