TRAPPING OF P-COUMARYL AND CONIFERYL ALCOHOL DURING SODA/AQ TREATMENT - A MEANS OF ESTIMATING UNCONDENSED β-O-4 IN NATIVE LIGNIN
It was recently observed that ethylguaiacol (EG) is quite efficient at trapping coniferyl alcohol (CA) generated from the cleavage of uncondensed β-O-4 dimmers during soda-AQ or SAQ delignification of a hardwood. Some of the CA is transformed to vinylguaiacol (VG) and isoeugenol (IE) and the a-carbon atom in all three monomers condense to the C-5 position of EG. In the present research the feasibility of quantifying uncondensed β-O-4 structures where the ring that rearranges to the quinone methide is a guaiacyl (G) or phydroxyphenylpropane (H) unit was investigated. Central to this approach is the efficiency of EG trapping of CA, pcoumaryl alcohol (p-CMA) and their transformation products. The estimates of uncondensed β-O-4 structures in hardwood and bagasse lignin by this approach were in close agreement with traditional but more tedious methods such as permanganate oxidation and 31P NMR.
hardwoods bagasse lignin depolymerization Soda-AQ coniferyl alcohol p-coumaryl alcohol
E. F. Alves S. K. Bose R. C. Francis
Department of Paper and Bioprocess Engineering (PBE)/Empire State Paper Research Institute (ESPRI), SUNY College of Environmental Science & Forestry (ESF), I Forestry Drive, Syracuse, New York USA 13210
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
285-292
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）