Table 3 Origin of ions seen in py–MBMS spectra of lignin DHPs

Monomers

4-Vinylphenol

H

–

H

Guaiacol

G

Coniferyl alcohol, homovanillin, 4-ethylguaiacol

G

4-Methylguaiacol

G

–

H

4-Vinylguaiacol, p-coumaryl alcohol

G, H

Syringol

S

Allyl-, propenyl guaiacol

G

Propiosyringone, syringylacetone, 4-ethylsyringol

S

4-Methylsyringol, dimethoxyquinone

S

Coniferyl aldehyde

G

Coniferyl aldehyde, 4-vinylsyringol

G, S

Syringaldehyde

S

4-Propenylsyringol

S

Sinapaldehyde

S

Sinapyl alcohol

S

Dimers

–

H–H

–

H–H

–

H–H, G–G

–

G–G

–

H–H

–

G–G

–

G–G

–

G–G

–

G–G

–

S–S

–

S–S