Which of the following preservatives is most effective

Solution

• Sodium Benzoate 
  • It acts as an antioxidant and a reducing agent, preventing oxidation reactions that can cause color changes in beverages.
  • It is particularly effective in acidic environments, making it suitable for many beverages like juices and wines.
  • It inhibits the growth of microorganisms, which can also degrade color.
• Potassium Metabisulfite (KMS) :
  • Primarily used as an antimicrobial agent but not as effective in color retention.
  • Works best at a low pH but does not directly prevent oxidation of color compounds.