Pyridyloxide T-Butylnitrone

INCI: PYRIDYLOXIDE T-BUTYLNITRONE [^1_17]

CAS Number
66893-81-0 [^1_17]
Function
Antioxidant (radical spin-trap agent); structurally analogous to PBN (Phenyl T-Butylnitrone) but with a pyridine N-oxide ring for enhanced radical scavenging [^1_18][^1_17]
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status permitted
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Permitted in cosmetics; no specific FDA monograph

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety (MoS)
adequate
Dermal Absorption
moderate
Sensitization
moderate

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

Nitrone spin-trap chemistry โ€” while the mechanism (trapping free radicals) is beneficial, the resulting radical adducts should be considered in the safety assessment. Less commercially established than PBN. Ensure supplier provides genotoxicity/mutagenicity data, as nitrone derivatives warrant this screening [^1_17][^1_18]

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Concern Level: High

Frequently Asked Questions

Is Pyridyloxide T-Butylnitrone safe in cosmetics?

Nitrone spin-trap chemistry โ€” while the mechanism (trapping free radicals) is beneficial, the resulting radical adducts should be considered in the safety assessment. Less commercially established than PBN. Ensure supplier provides genotoxicity/mutagenicity data, as nitrone derivatives warrant this screening [^1_17][^1_18] The EU classifies Pyridyloxide T-Butylnitrone as "permitted". Safety rating: MODERATE.

Is Pyridyloxide T-Butylnitrone allowed in the EU?

Pyridyloxide T-Butylnitrone EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.

What does Pyridyloxide T-Butylnitrone do in cosmetics?

Pyridyloxide T-Butylnitrone functions as: Antioxidant (radical spin-trap agent); structurally analogous to PBN (Phenyl T-Butylnitrone) but with a pyridine N-oxide ring for enhanced radical scavenging [^1_18][^1_17]. It is classified as a cosmetic ingredient in our database. CAS number: 66893-81-0 [^1_17].

What is the Margin of Safety for Pyridyloxide T-Butylnitrone?

adequate The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

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