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Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Lignin content, phenolic acid content, and alkaline nitrobenzene oxidation yields from five different lignocellulosics

From: Characterization of lignin-derived products from various lignocellulosics as treated by semi-flow hot-compressed water

Lignocellulosic

Lignin content (wt%)

Phenolic acids (wt%)

Nitrobenzene oxidation yieldsa (molar ratio to vanillin)

Ferulic acid

p-Coumaric acid

p-Hydroxybenzoic acid

VA

SA

HA

Jpn. cedar

32.0

–

–

–

1

0

0.05

Jpn. beech

24.0

–

–

–

1

2.19

0

Nipa frond

19.6

0.13

0.03

0.78

1

2.15

0.10

Rice straw

20.2

0.55

0.79

–

1

0.67

0.41

Corn cob

18.0

0.77

1.50

–

1

0.80

0.79

  1. VA vanillin, SA syringaldehyde, HA p-hydroxybenzaldehyde
  2. aLignin in monocotyledons contained cinnamic acids such as ferulic and p-couamric acids, and they can be converted into VA and HA, respectively. Thus, the cinnamic acids-derived oxidation yields were subtracted from the original oxidation yields to obtained lignin-derived oxidation yields. The amount of ferulic acid-derived VA (mg) is assumed by 0.317 × ferulic acid content in biomass (mg), and the amount of p-coumaric acid-derived HA is assumed by 0.321 × p-coumaric acid content in biomass (mg)
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