Direct analysis of stains on cloth caused by cosmetic

Helium was used as the DART gas. The DART gas heater was set to 200 °C. A small piece of cloth on which foundation was deposited was presented to the DART ion source.
Ions at m/z 371 were observed from the foundation of all 3 manufacturers. Based on the measured accurate masses, the elemental formula of the ions was elucidated to be C₁₀H₃₁O₅Si₅ and inferred to be the [M+H]⁺ ions of decamethylcyclopentasiloxane. Ions at m/z 223 were found only from Bland A and their elemental composition was elucidated to be C₁₀H₁₅O₂Si₂ from the measured accurate m/z.
By using DART ion source, the nature and cause of stains on cloth can be determined without sample preparation.

Fig. 1  A foundation stain on a piece of cloth.

Fig. 2  Mass spectra of foundation stains (Top: Bland A, Middle: Bland B, Bottom: Bland C)

Table 1 Elucidated elemental compositions of the ions found in the mass spectrum of Bland A.

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