Aluminium potassium sulfate

International Numbering System (INS) for Food Additives: 522
Food additives Europe numbers: E522 

Aluminum potassium sulfate, also known as alum, can be found as a food additive, but its use is quite limited and controversial due to safety concerns. Here's a breakdown:

• Historical Use as a Firming Agent: Alum has a long history of use as a firming agent in various food applications, such as:
  • Pickling: Helping vegetables stay crisp [1].
  • Baking Powders (Historically): As an acidic component in some historical formulations of baking powder [2].
• Safety Concerns and Decline in Use: Over time, concerns have arisen about the potential negative health effects of aluminum, and its use in food has significantly declined:
  • Limited Absorption: While some aluminum might be absorbed from food, most is excreted through stool [3]. However, potential risks related to long-term accumulation are debated.
  • Regulatory Restrictions: Many regulatory bodies have restricted or banned the use of alum as a food additive due to these safety concerns [4].
• Alternatives for Firming and Leavening: Safer alternatives are readily available for firming and leavening in food science:
  • Calcium chloride: A common firming agent used in pickling and other applications [5].
  • Leavening Agents: Baking powder formulations without alum and other leavening agents like yeast effectively leaven baked goods [6].
• Current Use (Limited): Due to safety concerns and regulations, the use of alum in food additives is uncommon and restricted in many regions. It may still be used in some niche applications or traditional food production methods in certain areas, but this usage is not widespread.

Overall:

Aluminum potassium sulfate (alum) has a history of use as a firming agent in food, but safety concerns have led to a decline in its use. Regulatory bodies often restrict or ban it as a food additive. Safer alternatives are available for firming and leavening in food science.