Fig. 3
From: Raman spectroscopy-based identification of toxoid vaccine products
Technical variance of Raman spectra depending on the length of drying. For a detailed view, the Raman data of the three vaccine products dTaP-IPV2, IPV, dT2 were split into the data subsets of the replicate measurements. The mean spectra of the separate technical replicates are plotted according to drying time (from bottom to top). The standard deviations are visualized by the grey shades around each spectrum. Prominent signals of phenoxyethanol are highlighted by asterisks in analogy to Badawi et al.19. The signal intensities of phenoxyethanol decrease to different extents during the course of drying. All spectra were normalized for an effective comparison and shifted vertically for visualization
