Food preservatives are chemicals added to food to maintain freshness and extend shelf life. Food preservatives are included in food additives (BTP). 

How food preservatives work :

• Acidify, neutralize, and maintain the acidity of food ingredients
• Emphasize flavor, color, and preservatives
• Lower the pH or acidity level in food
• Prevent the growth of microorganisms that can cause food to rot
• Extend shelf life