Tetrasodium Glutamate Diacetate (GLDA-Na4) is used in shampoos primarily as a chelating agent that improves cleansing and foam performance by binding metal ions present in hard water.
Core Function
GLDA-Na4 is a biodegradable chelating agent derived from glutamic acid (a naturally occurring amino acid). Its main role in shampoo is to sequester metal ions such as calcium (Ca²⁺), magnesium (Mg²⁺), and iron (Fe³⁺) that are present in tap water.
Specific Benefits in Shampoo
Improved Cleansing & Foaming: By softening hard water, GLDA-Na4 allows surfactants to perform more effectively. This results in enhanced cleansing and foam compared to formulas without it.
Preservative Boosting: It enhances the effectiveness of preservatives in the formula, which may allow for reduced preservative concentrations while maintaining product safety and shelf life.
Stability & Appearance: It prevents metal ions from catalyzing oxidation reactions, helping to protect the shampoo’s color and odor and extend its overall stability.
Eco-Friendly & Mild: Unlike traditional chelators such as EDTA, GLDA-Na4 is readily biodegradable and is considered gentle and non-irritating to the skin.
Usage Reference
Parameter Value
Typical Concentration 0.1% – 0.5%
Incorporation Add to the aqueous phase or at the end of formulation