Lignin in wheat internodes. Part 2: Alkaline nitrobenzene oxidation by wheat straw lignin and its fractions

Abstract

the youngest internodes but became positive with increasing maturity. The Miiule colour reaction (red purple colour) was not given by any wheat internode sample (S/V < 2). In contrast, samples 3 o m dicotyledonous angiosperms (S/V > 2) all gave positive tests.

Peroxidase catalyzed co-polymerization of pentachlorophenol and a potential humic precursor

“…The total chlorophenol recovery at 120 min was about 18% of the initial solution and 35% of the dialysis residue AOX. This yield is appropriate considering that the recovery of phenolic substances from lignin in general is about 30% (Lam et al, 1990;Kuroda et al, 1994).…”

Prospects for improving the nutritive value of temperate, perennial pasture grasses

“…There is some evidence that the quality of the lignin present in walls may affect fibre digestibility (Buxton & Russell 1988;Jung &Deetz 1993;Lam et al 1993). Certainly the monomeric composition (Lam et al 1990b) and the nature of intermonomer linkages (Iiyamaetal. 1991) and form (extractability) (Lam et al 1990b) of lignin in walls changes during maturation although the impact of these changes on digestibility, if any, is not clear.…”

“…Certainly the monomeric composition (Lam et al 1990b) and the nature of intermonomer linkages (Iiyamaetal. 1991) and form (extractability) (Lam et al 1990b) of lignin in walls changes during maturation although the impact of these changes on digestibility, if any, is not clear. The bmr (brown mid rib) mutants of sorghum, maize, and pearl millet are reported to have higher IVDMD than the normal genotypes (see Buxton & Casler 1993 for a summary).…”

“…Lignin in wheat and phalaris internodes occurs in several forms differing in their extractability (Lam et al 1990b). These forms alter in proportion during maturation.…”

Structural Modification of Lignin in Peat during Peat Formation at Tropical Swamp

“…4) and UV (Fig. 5) 1,223 (syringyl substituted with -CO group), 1,126 (syringyl CH), 1,033 (guaiacyl CH), and 831 cm -1 (syringyl CH), which were assigned by Kawamura and Higuchi 27 , Lam et al 31 and Sun et al 42 . Ionization difference (ΔE i ) spectra of the Björkman lignins isolated showed around 295 and 370 nm assigned to unconjugated and conjugated phenolic hydroxyl groups, respectively 10 .…”