DART Application: Direct analysis of stains on cloth caused by cosmetic

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MSTips No.D023 Application Note for DART

 Foundation is one of the essential cosmetics for women. At the mean time, it often makes a stain on clothing. We directly analyzed foundation stains on cloth (Fig. 1) without sample preparation by using DART (Direct Analysis in Real Time) ion source installed on AccuTOF™ LC  series. Foundation from 3 manufacturers were measured and compared.

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

Measured m/z Calculated m/z Error (x 10-3) Elemental composition Unsaturation
223.06194 223.06106  0.88 C10H15O2Si2 5.5
371.10100 371.10178 -0.78 C10H31O5Si5 0.5

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

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