Monographs on fragrance raw materials.
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Musk ambrette (2,6-dinitro-3-methoxy-4-tert-butyltoluene), a nitro-musk compound widely used as a fixative in fragrance formulations and found to a lesser degree in flavor compositions, produces hindlimb weakness when administered in the diet or applied to skin of rats for periods up to 12 weeks. Underlying neuropathologic changes consist of primary demyelination and distal axonal degeneration in selected regions of the central and peripheral nervous system. Murine neurological disease induced by musk ambrette occurs at doses well above estimated maximum daily human exposure. Lifetime experimental neurotoxicology studies using lower concentrations of musk ambrette for prolonged periods would be needed for the estimation of human risk.
Nitro benzenoid musk compounds (Musk tibetene [CAS no. 145-39-1], Musk ambrette [83-66-9], Musk moskene [116-66-5], Musk ketone [81-14-1] and Musk xylene [81-15-2]) and non-nitro benzenoid musks (Celestolide [13171-00-1], Galaxolide [1222-05-5]) and Fixolide [1506-02-1] [21445-77-7] were analysed in 15 human adipose tissue samples from Switzerland by gas chromatography/high resolution mass spectrometry. The levels of Musk xylene and Galaxolide ranged up to 288 ng/g lipids and 171 ng/g lipids, respectively. The concentrations of non-nitro benzenoid musks found in human adipose tissue raise concern since very few toxicological data are available.