Vibrational Spectroscopies and Chemometry for Nondestructive Identification and Differentiation of Painting Binders

Table 2

Main near infrared and Raman bands, characteristic for different classes of binding media, highlighted by PCA applied on combined spectra referred to all neat binders.

Class of binders	FT-NIR	Micro-Raman
Polysaccharide-based		δ(COC) sugar ring vibrations
Lipid-based	1st overtone CH2	δ(CH2); ν(C-C)
Protein-based		Amide I; δ(CH2); Phe ring breathing