Figure 8

PCA analysis. Projection of samples onto the space spanned by the first two principal components (PCs). (lowercase and uppercase letters are related to the aged and non aged samples); (A,a) filter paper; (B-D, b-d) filter paper treated with PEO hydrogel for 15, 30 and 45 minutes; (E-F, e-f) filter paper treated with PLU hydrogel for 15 and 45 minutes; (G,g) filter paper loaded with linseed oil; (H,h) filter paper loaded with linseed oil and treated with PEO hydrogel; (I,i) filter paper loaded with linseed oil and treated with PLU hydrogel. Red circles are for clarity.