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TRIMETHOXYBENZYLIDENE PENTANEDIONE.

Valuable CAS 945558-97-4 / ANTIOXIDANT, CHELATING, SKIN PROTECTING

TRIMETHOXYBENZYLIDENE PENTANEDIONE (TMBP) is a multi-functional cosmetic ingredient renowned for its critical role in photostabilizing UV filters and significantly boosting SPF. Beyond enhancing sun protection, it also acts as an antioxidant, a chelating agent, and a protector against external skin influences, contributing to overall product efficacy and stability.

Summary

Photostabilizer SPF Booster Antioxidant Chelating Skin Protecting

Science

Mechanism of Action

TMBP primarily functions by stabilizing UV filters, particularly avobenzone, through triplet-state energy transfer and light-induced reactions that preserve the filters' active chromophores. Additionally, it offers antioxidant protection by inhibiting oxygen-initiated degradation pathways, chelates metal ions to maintain product stability and appearance, and contributes to overall skin protection by mitigating external environmental stressors.

Research

Clinical Evidence

High confidence
Effective range 0.5–2.5%
Optimal

N/A

Key findings

  1. 01 Studies demonstrate that TMBP concentrations ranging from 0.5% to 2.5% can boost in-vivo SPF by 50% or more in both organic and inorganic sunscreen formulations.
  2. 02 Optimal photostabilization and SPF boosting of avobenzone is achieved when TMBP is formulated at a 1:1 ratio with avobenzone.

Transparency

Dusting Analysis

Not commonly dusted

TRIMETHOXYBENZYLIDENE PENTANEDIONE functions as a photostabilizer and SPF booster within formulations, rather than as an ingredient with a 'dusting' effect when applied directly to the skin.

The Formula

Formulation

Solubility
Oil
Optimal pH ≤6.5
0 7 14

Stability

TMBP exhibits excellent heat and photostability; however, opaque packaging is recommended for the final product to ensure long-term integrity. It requires formulation within an acidic pH range, specifically below 6.5. Pre-solubilization in an emollient phase with gentle heating (65-70°C) is essential to prevent crystallization within the formulation over time.

Synergies

  • Avobenzone (for enhanced UV filter photostability and SPF boosting)

Conflicts

  • Sodium hydroxide
  • Potassium hydroxide
  • Alumina coated inorganic sunscreens
  • Non-coated zinc oxides
  • Iron ions (potential for yellowish discoloration)
  • Copper ions (potential for yellowish discoloration)

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Unknown

TRIMETHOXYBENZYLIDENE PENTANEDIONE is REACH registered and globally approved, with the exception of China. There are currently no direct CIR, SCCS, or FDA safety assessments specifically for its cosmetic use. PubChem data presents mixed GHS hazard criteria regarding respiratory irritation, with some reports indicating a potential for irritation and others asserting no such hazard; however, these are not specific to skin sensitization in cosmetic applications.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
Yes Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

TRIMETHOXYBENZYLIDENE PENTANEDIONE is a valuable ingredient, significantly enhancing the efficacy and stability of sunscreens, especially those containing avobenzone, while also providing beneficial antioxidant and chelating properties to cosmetic formulations.

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