Bamboo lignin

Nakatsubo F, Tanahashi M, Higuchi T (1972) Acidolysis of bamboo lignin II Isolation and identification of acidolysis products Wood Res 53 9-18... 

Fig. 6.2.2. Total ion chromatogram of nitrobenzene oxidation mixture from milled bamboo lignin (MBL) prepared from Phyllostachys pubescence See Section 6 2 2 4 2 for GC conditions...

As mentioned previously (Chap. 2.2.2.4.1), the major purpose of the GC-MS analysis of a nitrobenzene or cupric oxide oxidation mixture is to verify the identity of the oxidation products established previously by GC or HPLC analysis, and to elucidate the structure of unknown constituents. For example, GC-MS analysis of the nitrobenzene oxidation mixture of milled bamboo lignin from Phyllostachys pubescence showed unequivocally that compounds (l)-(3) in the total ion chromatogram of the oxidation mixture (Fig. 6.2.2) are indeed p-hydroxybenzaldehyde, vanillin, and syringaldehyde, respectively (Tai et al. 1990) (see Chap. 9.1 for a discussion of the GC-MS technique). In addition, the unknown compound in the chromatogram was identified as p-hydroxyazobenzene (15) (Fig. 6.2.1), one of the phenolic reduction products of nitrobenzene. 

Nakamura Y, Higuchi T (1976) Ester linkage of p-coumaric acid in bamboo lignin Holzforschung 30 187-191... 

Tanahashi M, Nakatsubo F, Higuchi T (1975) Structural elucidation of bamboo lignin by acidolysis and ozonolysis I Wood Res 58 1-11... 

Table 7.1.1. Total, phenolic and aliphatic hydroxyl contents of some representative milled wood and bamboo lignins (MWL and MBL) and technical lignins based on C9 unit... 

The milled bamboo lignin (MBL) from P. pubescence contains approximately 5% carbohydrates and 6.9% proteins (Tai et al. MBL-S = MBL after saponification with alkaline solution. 

T Takei, T Kato, T lijima, and M Higaki. Raman Spectroscopic Analysis of Wood and Bamboo Lignin. Mokuzai Gakkaishi 41 229-236, 1995. 

Nakamura, Y, and Higuchi, T. (1978) Ester linkage of p-coumaric acid in bamboo lignin. II. Syntheses of coniferyl p-hydroxyhenzoate and coniferyl p-coumarate as possible precursors of aromatic acid esters in lignin. Cellul. Chem. Technol. 12(2), 199-208. 

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