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Table 4 Molecular ions detected by LC–ESI–MS for the main products of dimeric lignin model compounds in VP-catalyzed reactions

From: A novel and efficient fungal delignification strategy based on versatile peroxidase for lignocellulose bioconversion

Substrate

Retention time (min)

Product peaka

m/z

Proposed products

7 (β-O-4 dimer)

4.5

A

637 [M − H]−

β-O-4 tetramer

5.8

B

183 [M + H]+

Dihydroconiferyl alcohol

8 (5-5′ dimer)

4.5

C

153 [M − H]−

Vanillic alcohol

5.2

D

167 [M − H]−

Vanillic acid

5.7

E

303 [M − H]−

2′,6-Dihydroxy-5′-(hydroxymethyl)-3′,5-dimethoxy-[1,1′-biphenyl]-3-carbaldehyde

6.3

F

151 [M − H]−

Vanillic aldehyde

8.4

G

301 [M − H]−

Dehydrodivanillic aldehyde

  1. aProduct peaks marked on HPLC chromatograms in Fig. 4