Table 4 Methyl paraben concentration detected in the stratum corneum after application of cosmetic lotion (0.03%) from the triplicate assay values.

From: A derivatization-enhanced detection strategy in mass spectrometry: analysis of 4-hydroxybenzoates and their metabolites after keratinocytes are exposed to UV radiation

 

Concentration (μg/cm2)

RSD (%)

 

1 hr

2 hr

1 hr

2 hr

Volunteer 1

0.98 ± 0.04

1.30 ± 0.03

4.1

2.3

Volunteer 2

1.94 ± 0.05

3.17 ± 0.07

2.6

2.2

Volunteer 3

2.24 ± 0.07

2.06 ± 0.11

3.1

5.3

Average

1.72

2.18

  
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