Abstract :
[en] A transmission detection mode was investigated with SERS analyses (SETRS). A comparison between back-
scattering and transmission detection modes was conducted to demonstrate the feasibility of performing SETRS
analyses. The impact of various parameters on the SERS signal intensity such as sample volume, lens collection
optic, laser beam size and laser power were then examined. The analytical performances of SETRS were further
evaluated through the quantification of an impurity (4-aminophenol) ranging from 3 to 20 μg/mL in a com-
mercial pharmaceutical product using a total error risk-based approach. To account for expected variability of
routine analysis, 9 batches of silver nanoparticles suspensions were used and experiments were performed over 5
different days and by 2 operators. Univariate spectral analysis based on a quadratic regression was compared to a
multivariate approach using a partial least square regression. The presented results demonstrated that SETRS can
be used to determine an impurity in a complex matrix opening new perspectives for quantitative applications.
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