Nisin

International Numbering System (INS) for Food Additives: 234
Food additives Europe numbers: E234 

Nisin is a unique case in the world of food excipients because it straddles the line between a preservative and an excipient. Here's why:

• Antimicrobial Properties: Nisin is a naturally occurring bacteriocin, a type of antimicrobial compound produced by certain bacteria. Its primary function is to inhibit the growth of other harmful or spoilage-causing bacteria in food.
• Preservative Effect: By preventing the growth of harmful bacteria, nisin helps extend the shelf life of food products and reduces the risk of foodborne illness. This aligns with the typical role of a food preservative.
• Generally Recognized as Safe (GRAS): Nisin is generally recognized as safe (GRAS) by regulatory bodies like the US Food and Drug Administration (FDA) [1]. This means it's considered safe for human consumption at approved levels.

However, there are some aspects that make nisin lean slightly towards an excipient as well:

• Limited Impact on Taste and Texture: Unlike some preservatives that can alter the taste or texture of food, nisin typically has minimal impact on these sensory qualities when used in appropriate amounts.
• Not Always Essential: Nisin isn't always strictly necessary for the core function (like structure) of the food itself, unlike some thickening or bulking excipients.