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Moumoujus

BUTYL UNDECENOATE.

Optional CAS 109-42-2 / PERFUMING

Butyl Undecenoate is a lightweight ester that delivers dual-action benefits as both an emollient and antimicrobial agent. This versatile ingredient creates a protective barrier on skin while potentially offering mild antifungal properties derived from its undecylenic acid backbone. Its non-greasy film-forming properties make it particularly valuable in formulations targeting moisture retention without heaviness.

Summary

Emollient Skin Conditioning Agent Masking Agent Antimicrobial

Science

Mechanism of Action

Forms a thin, breathable film on the stratum corneum that reduces transepidermal water loss while conditioning the skin surface. The undecylenic acid component may provide secondary antimicrobial activity against dermatophytes, though at reduced potency compared to the free acid form.

Research

Clinical Evidence

Medium confidence
Effective range 3–8%
Optimal

5%

Key findings

  1. 01 Human patch testing at 8% concentration showed zero irritation or sensitization responses
  2. 02 Undecylenic acid esters at 3-5% demonstrated antimycotic efficacy against skin fungi

Transparency

Dusting Analysis

Not commonly dusted

Primarily used in specialized applications like antifungal treatments and fragrance masking rather than general skincare formulations

The Formula

Formulation

Solubility
Oil
Optimal pH 4 – 8
0 7 14

Stability

Demonstrates excellent stability under standard storage conditions but susceptible to hydrolysis when exposed to extreme pH environments

Conflicts

  • Strong oxidizing agents
  • Strong acids
  • Strong bases

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
8%
Sensitization risk Low

FEMA GRAS status (No. 2216) for food applications. RIFM safety assessments support use up to 8% in fragrance concentrates, translating to <1% in final skincare products.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Optional

A specialized ingredient offering unique antimicrobial-emollient properties but with limited mainstream skincare applications.

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