Carbon-13 Enrichment of Rice Stalk Lignin Traced by Solid State 13C NMR Spectroscopy

Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (6): 1073.

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Carbon-13 Enrichment of Rice Stalk Lignin Traced by Solid State ¹³C NMR Spectroscopy

GU Rui-Jun¹, XIE Yi-Min¹, ZENG Shao-Qiong¹, WU Hong¹, Seiichi-Yasuda²

1. State Key Lab. of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640,China;
2. School of Agricultural Science, Nagoya University, Nagoya University, Nagoya 464-8601, Japan

Received:2001-03-09 Online:2002-06-24 Published:2002-06-24

Abstract

Abstract: Carbon-13 enrichment of specific carbon of rice stalk lignin was achieved by feeding coniferin-[ α-¹³C], coniferin-[ β-¹³C] and coniferin-[ γ-¹³C] into an internode cavity of the stalk of a growing rice plant(Oryza sativa L.). The resulting rice stalk tissues were analyzed by high-resolution solid state carbon-13 nuclear magnetic resonance (¹³C NMR) spectroscopy. It was found that the administration did not affect the normal ligninfication of rice plant. It was also proved that β-O-4, β-β, β-5 and β-1 were mainly a substructure in protolignin of rice stalk although there were some minor substructures as coniferyl alcohol and ferulic acid unit. Importantly, the result indicated that significant bonding occurred at α-position to other constituents, presumed to be mainly of carbohydrates.

Key words: Rice stalk, Lignin, Carbon-13 isotopic tracer, Solid state ₁₃ CNMR spectroscopy

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GU Rui-Jun, XIE Yi-Min, ZENG Shao-Qiong, WU Hong, Seiichi-Yasuda . Carbon-13 Enrichment of Rice Stalk Lignin Traced by Solid State ¹³C NMR Spectroscopy[J]. Chem. J. Chinese Universities, 2002, 23(6): 1073.

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Carbon-13 Enrichment of Rice Stalk Lignin Traced by Solid State ¹³C NMR Spectroscopy

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