Fig. 3
Example of material residues on a tissue slide after deparaffinization and discrimination from MP particles by exploiting characteristic spectral features. Residues of (a) polyisobutylene (green arrow) and (b) paraffin (blue arrow) that challenge the identification of MP particles. (c) One specific band, centered at wavenumber 2959 cm- 1 can be used to clearly discriminate paraffin and PE, a common MP polymer. In contrast, polyisobutylene exhibits a spectral signature that can be clearly differentiated from that of paraffin, indicating that the presence of polyisobutylene does not interfere with the detection of PE.
