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TRIPOTASSIUM EDTA.

Valuable CAS 17572-97-3 / CHELATING

Tripotassium EDTA is a highly effective chelating agent used to bind metal ions in formulations, preventing unwanted reactions that can degrade product stability and performance. It ensures optimal efficacy of other active ingredients, maintains product integrity, and improves the overall user experience by counteracting hard water effects.

Summary

chelating

Science

Mechanism of Action

This ingredient functions by sequestering metal ions, such as calcium, magnesium, iron, and copper, which are often present in water or raw materials. By forming stable complexes with these ions, Tripotassium EDTA neutralizes their reactivity, thereby preventing detrimental effects like oxidative degradation, discoloration, and reduced efficacy of preservatives and antioxidants. On the skin and hair, it mitigates the adverse effects of hard water by preventing metal ion deposition, and its chelating action can enhance the activity of antimicrobials against certain bacteria.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

Tripotassium EDTA is a foundational formulation ingredient, not typically used for 'dusting' or marketing claims related to direct skin benefits at high percentages. Its value lies in its behind-the-scenes role in product stability and efficacy.

The Formula

Formulation

Solubility
Water
Optimal pH 7 – 9
0 7 14

Stability

Tripotassium EDTA exhibits excellent stability at room temperature. Its 5% aqueous solutions typically present a pH of 7.3 ± 1, with an effective pH range for optimal performance between 7.0 and 9.0. While stable across a broad pH spectrum, the integrity of its metal chelates can be compromised; specifically, calcium and magnesium complexes may decrease in stability below pH 4-5, and iron complexes can be affected by hydrolysis above pH 8-9.

Synergies

  • Enhances the efficacy and stability of preservatives
  • Boosts the performance of antioxidants
  • Improves the foaming characteristics of cleansing agents
  • Can potentiate the activity of certain antimicrobials against Gram-negative bacteria

Conflicts

  • Heavy metal ions (as it actively chelates them)
  • Strong acidic environments (may destabilize calcium and magnesium chelates)
  • Strong alkaline environments (may destabilize iron chelates)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
0.85%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Tripotassium EDTA and its salts safe for use in cosmetic formulations. While not significantly absorbed through the skin, formulators should note its potential to influence the transdermal passage of other compounds by chelating calcium. Typical use concentrations are often below 0.5%, with a recommended maximum of 0.85% in leave-on products. It is also recognized as an FDA Food Contact Substance.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Tripotassium EDTA is a valuable formulation asset, crucial for maintaining product stability, enhancing preservative efficacy, and optimizing the overall performance and shelf-life of precision skincare products.

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