Oxidation in acidic medium of lignins from agricultural residues

被引：18

作者：

Amaral Labat, Gisele Aparecida ^{[1
]}

Goncalves, Adilson Roberto ^{[1
]}

机构：

[1] Univ Sao Paulo, EEL, Dept Biotecnol, Caixa Postal 116, BR-12602810 Lorena, SP, Brazil

来源：

APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY | 2008年 / 148卷 / 1-3期

基金：

巴西圣保罗研究基金会;

关键词：

sugarcane bagasse; sugarcane straw; oxidation in acidic medium; chelating agents; FTIR; PCA;

D O I：

10.1007/s12010-007-8120-0

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Agricultural residues as sugarcane straw and bagasse are burned in boilers for generation of energy in sugar and alcohol industries. However, excess of those by-products could be used to obtain products with higher value. Pulping process generates cellulosic pulps and lignin. The lignin could be oxidized and applied in effluent treatments for heavy metal removal. Oxidized lignin presents very strong chelating properties. Lignins from sugarcane straw and bagasse were obtained by ethanol-water pulping. Oxidation of lignins was carried out using acetic acid and Co/Mn/Br catalytical system at 50, 80, and 115 degrees C for 5 h. Kinetics of the reaction was accomplished by measuring the UV-visible region. Activation energy was calculated for lignins from sugarcane straw and bagasse (34.2 and 23.4 kJ mol(-1), respectively). The first value indicates higher cross-linked formation. Fourier-transformed infrared spectroscopy data of samples collected during oxidation are very similar. Principal component analysis applied to spectra shows only slight structure modifications in lignins after oxidation reaction.

引用

页码：151 / 161

页数：11

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