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Ren H.,Nanjing Forestry University | Zhai H.,Nanjing Forestry University | Zhang Y.,Asia Research and Development Center | Jin Y.,Nanjing Forestry University | Omori S.,New York University
Cellulose Chemistry and Technology | Year: 2013

Acetosyringone, a phenolic ketone, and two substituted cinnamic acids were isolated from wheat straw soda cooking effluent or black liquor by solvent fractionation, silica gel column chromatography and crystallization. The three compounds were identified as acetosyringone, ferulic acid and p-coumaric acid by MS, 1H-NMR, 13C-NMR and melting point analyses. The isolation of these compounds from black liquor (BL) was quite tedious; therefore a novel but simple synthesis approach was attempted for the hydroxyacetophenones (acetosyringone, acetoguaiacone and phydroxyacetophenone). The spectroscopic data for the three isolated compounds and the three synthesized compounds were all consistent with the data that would be expected for authentic hydroxyacetophenones and substituted cinnamic acids.

Li Z.,Nanjing Forestry University | Zhai H.,Nanjing Forestry University | Zhang Y.,Asia Research and Development Center | Yu L.,Asia Research and Development Center
Industrial Crops and Products | Year: 2012

This paper investigated cell morphology, chemical components, lignin distribution and inorganic elements distribution of corn stover fractions. Corn stover fractions, classified as stalk rind, stalk pith and leaf, had different tissues, cell morphology and chemical compositions. Corn stalk rind had good fiber morphological characteristics for papermaking, while stalk pith, having short fibers and high contents of parenchyma and vessel, was not suitable for papermaking. Stalk rind had the highest lignin and cellulose content but the lowest hemicellulose content among all the fractions. The major ash-forming elements in corn stover fractions were potassium, chlorine, silica, calcium, magnesium and sulfur. Potassium and chlorine took more than 86% of total inorganic elements in stalk rind while silica content was much higher in leaf and stalk pith than that in stalk rind. Perivascular sclerenchyma and subepidermal sclerenchyma of stalk rind were more lignified than the other tissues. The highest lignin concentration existed in cell middle lamella and corner. All corn stover fractions could be good biorefinery feedstock based on their main chemical compositions, though they are obviously heterogeneous in aspects of cell morphology and chemical characteristics. © 2011 Elsevier B.V.

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