RESUMO
In this study, 80 lipsticks were obtained and evaluated using Raman spectroscopy at excitation wavelengths of 532 and 780 nm. Fluorescence severely limited analysis with the 532 nm line while the 780 nm line proved useful for all samples analyzed. It was possible to differentiate 95% of the lipsticks evaluated based on one or more Raman peaks. However, there were no peak trends observed that could be used to identify a manufacturer or categorize a sample. In situ analysis of lipstick smears was found to be possible even from several Raman active substrates, but was occasionally limited by background fluorescence and in extreme cases, photodegradation.
RESUMO
The effect of naltrexone vs. placebo on alcohol-provoked flushing was studied in 20 healthy subjects of Oriental ancestry and 20 healthy white subjects. The intensity of the flushing reactions was assessed by two independent methods, the cutaneous perfusion index by laser Doppler velocimetry and the change in malar thermal circulation index by telethermometry. No effect of naltrexone on alcohol-provoked flushing was detected with either method in either racial group. The incidence of abdominal discomfort and nausea associated with naltrexone treatment was much greater among Orientals than whites.